Physical
Activity
and
Health

A Report of the Surgeon General

U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES
Centers for Disease Control and Prevention
National Center for Chronic Disease Prevention and Health Promotion
The President's Council on Physical Fitness and Sports


Suggested Citation

U.S. Department of Health and Human Services. Physical Activity and Health:
A Report of the Surgeon General. Atlanta, GA: U.S. Department of Health and
Human Services, Centers for Disease Control and Prevention, National
Center for Chronic Disease Prevention and Health Promotion, 1996.

For sale by the Superintendent of Documents,
P.O. Box 371954, Pittsburgh, PA 15250-7954,
      s/No17-023-00196-5


Message from Donna E. Shalala
Secretary of HeaIth and Human Services

The United States has led the world in understanding and promoting the
benefits of physical activity. In the 1950s we launched the first national effort to
encourage young Americans to be physically active, with a strong emphasis on
participation in team sports. In the 1970s we embarked on a national effort to
educate Americans about the cardiovascular benefits of vigorous activity, such as
running and playing basketball. And in the 1980s and 1990s we made break-
through findings about the health benefits of moderate-intensity activities, such as
walking, gardening, and dancing.

Now, with the publication of this first Surgeon General's report on physical
activity and health, which I commissioned in 1994, we are poised to take another
bold step forward. This landmark review of the research on physical activity and
health-the most comprehensive ever-has the potential to catalyze a new physical
activity and fitness movement in the United States. It is a work of real significance,
on par with the Surgeon General's historic first report on smoking and health
published in 1964.

This report is a passport to good health for all Americans. Its key finding is that
people of all ages can improve the quality of their lives through a lifelong practice
of moderate physical activity. You don't have to be training for the Boston Marathon
to derive real health benefits from physical activity. A regular, preferably daily
regimen of at least 30-45 minutes of brisk walking, bicycling, or even working
around the house or yard will reduce your risks of developing coronary heart
disease, hypertension, colon cancer, and diabetes. And if you're already doing that,
you should consider picking up the pace: this report says that people who are
already physically active will benefit even more by increasing the intensity or
duration of their activity.

This watershed report comes not a moment too soon. We have found that 60
percent-well over half-of Americans are not regularly active. Worse yet, 25
percent of Americans are not active at all. For young people-the future of our
country-physical activity declines dramatically during adolescence. These are
dangerous trends. We need to turn them around quickly, for the health of our
citizens and our country.

We will do so only with a massive national commitment-beginning now, on
the eve of the Centennial Olympic Games, with a true fitness Dream Team drawing
on the many forms of leadership that make up our great democratic society.
Families need to weave physical activity into the fabric of their daily lives. Health
professionals, in addition to being role models for healthy behaviors, need to
encourage their patients to get out of their chairs and start fitness programs tailored
to their individual needs. Businesses need to learn from what has worked in the past


and promote worksite fitness, an easy option for workers. Community leaders need
to reexamine whether enough resources have been devoted to the maintenance of
parks, playgrounds, community centers, and physical education. Schools and
universities need to reintroduce daily, quality physical activity as a key component
of a comprehensive education. And the media and entertainment industries need to
use their vast creative abilities to show all Americans that physical activity is
healthful and fun-in other words, that-it is attractive, maybe even glamorous!
We Americans always find the will to change when change is needed. I believe
we can team up to create a new physical activity movement in this country. In doing
so, we will save precious resources, precious futures, and precious lives. The time
for action-and activity-is now.


Foreword

This first Surgeon General's report on physical activity is being released on the
eve of the Centennial Olympic Games- the premiere event showcasing the worlds
greatest athletes. It is fitting that the games are being held in Atlanta, Georgia, home
of the Centers for Disease Control and Prevention (CDC), the lead federal agency
in preparing this report. The games' loo-year celebration also coincides with the
CDC's landmark 50th year and with the 40th anniversary of the President's Council
on Physical Fitness and Sports (PCPFS), the CDC's partner in developing this
report. Because physical activity is a widely achievable means to a healthier life, this
report directly supports the CDC's mission- to promote health and quality of life
by preventing and controlling disease, injury, and disability. Also clear is the link
to the PCPFS; origin-ally established as part of a national campaign to help shape up
America's younger generation, the Council continues today to promote physical
activity, fitness, and sports for Americans of all ages.
The Olympic Games represent the summit of athletic achievement. The
Paralympics, an international competition that will occur later this summer in
Atlanta, represents the peak of athletic accomplishment for athletes with disabili-
ties. Few of us will approach these levels of performance in our own physical
endeavors. The good news in this report is that we do not have to scale Olympian
heights to achieve significant health benefits. We can improve the quality of our lives
through a lifelong practice of moderate amounts of regular physical activity of
moderate or vigorous intensity. An active lifestyle is available to all.
Many Americans may be surprised at the extent and strength of the evidence
linking physical activity to numerous health improvements. Most significantly,
regular physical activity greatly reduces the risk of dying from coronary heart
disease, the leading cause of death in the United States. Physical activity also reduces
the risk of developing diabetes, hypertension, and colon cancer; enhances mental
health; fosters healthy muscles, bones and joints; and helps maintain function and
preserve independence in older adults.

The evidence about what helps people incorporate physical activity into their
lives is less clear-cut. We do know that effective strategies and policies have taken
place in settings as diverse as physical education classes in schools, health promo-
tion programs at worksites, and one-on-one counseling by health care providers.
However, more needs to be learned about what helps individuals change their
physical activity habits and how changes in community environments, policies, and
social norms might support that process.

Support is greatly needed if physical activity is to be increased in a society as
technologically advanced as ours. Most Americans today are spared the burden of
excessive physical labor. Indeed, few occupations today require significant physical


acttvtty, and most people use motorized transportation to get to work and to perform
routine errands and tasks. Even leisure time is increasingly filled with sedentary
behaviors, such as watching television, "surfing" the Internet, and playing video
games.

Increasing physical activity is a formidable public health challenge that we must
hasten to meet. The stakes are high, and the potential rewards are momentous:
preventing premature death, unnecessary illness, and disability; controlling health
care costs\ and maintaining a high quality of life into old age.

David Satcher, M.D., Ph.D.                 Philip R. Lee, M.D.

Director
Centers for Disease Control
and Prevention

Assistant Secretary
for Health

Florence Griffith Joyner
Tom McMillen
Co-Chairs
President's Council on
Physical Fitness and Sports


    Preface
from the Surgeon General
U.S. Public Health Service

I am pleased to present the first report of the Surgeon General on physical
activity and health. For more than a century, the Surgeon General of the Public
Health Service has focused the nation's attention on important public health issues.
Reports from Surgeons General on the adverse health consequences of smoking
triggered nationwide efforts to prevent tobacco use. Reports on nutrition, violence,
and HIV/AIDS-to name but a few-have heightened America's awareness of
important public health issues and have spawned major public health initiatives.
This new report, which is a comprehensive review of the available scientific
evidence about the relationship between physical activity and health status, follows
in this notable tradition.

Scientists and doctors have known for years that substantial benefits can be
gained from regular physical activity. The expanding and strengthening evidence
on the relationship between physical activity and health necessitates the focus this
report brings to this important public health challenge. Although the science of
physical activity is a complex and still-developing field, we have today strong
evidence to indicate that regular physical activity will provide clear and substantial
health gains. In this sense, the report is more than a summary of the science-it is
a national call to action.

We must get serious about improving the health of the nation by affirming our
commitment to healthy physical activity on all levels: personal, family, community,
organizational, and national. Because physical activity is so directly related to
preventing disease and premature death and to maintaining a high quality of life,
we must accord it the same level of attention that we give other important public
health practices that affect the entire nation. Physical activity thus joins the front
ranks of essential health objectives, such as sound nutrition, the use of seat belts,
and the prevention of adverse health effects of tobacco.

The time for this emphasis is both opportune and pressing. As this report
makes clear, current levels of physical activity among Americans remain low, and
we are losing ground in some areas. The good news in the report is that people can
benefit from even moderate levels of physical activity. The public health implica-
tions of this good newsare vast: the tremendous health gains that could be realized
with even partial success at improving physical activity among the American
people compel us to make a commitment and take action. With innovation,
dedication, partnering, and a long-term plan, we should be able to improve the
health and well-being of our people.


This report is not the final word. More work will need to be done so that we can
determine the most effective ways to motivate all Americans to participate in a level
of physical activity that can benefit their health and well-being. The challenge that
lies ahead is formidable but worthwhile. 1 strongly encourage all Americans to join
us in this effort.

Audrey F. Manley, M.D`., M.P.H.
Surgeon General (Acting)


Physical Activity and Health

Acknowledgments

Editors

Steven N. Blair, P.E.D., Senior Scientific Editor,
Director of Research and Director, Epidemiology
and Clinical Applications, The Cooper Institute for
Aerobics Research, Dallas, Texas.

Adele L. Franks, M.D., Scientific Editor, Assistant
Director for Science, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta, Georgia.

Dana M. Shelton, M.P.H., Managing Editor,
Epidemiologist, Office on Smoking and Health,
National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

John R. Livengood, M.D., M.Phil., Coordinating
Editor, Deputy Director, Epidemiology and
Surveillance Division, National Immunization
Program, (formerly, Associate Director for Science,
Division of Chronic Disease Control and Community
Intervention, National Center for Chronic Disease
Prevention and Health Promotion), Centers for
Disease Control and Prevention, Atlanta, Georgia.

Frederick L. Hull, Ph.D., Technical Editor, Technical
Information and Editorial Services Branch, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Byron Breedlove, M.A., Technical Editor, Technical
Information and Editorial Services Branch, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

This report was prepared by the Department of
Health and Human Services under the direction of
the Centers for Disease Control and Prevention,
National Center for Chronic Disease Prevention and
Health Promotion, in collaboration with the
President's Council on Physical Fitness and Sports.

David Satcher, M.D., Ph.D., Director, Centers for
Disease Control and Prevention, Atlanta, Georgia.

J~~I~CS S. Marks, M.D., M.P.H., Director, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prcvcntion, Atlanta, Georgia.

Virginia S. Bales, M.P.H., Deputy Director, National
Ccntcr for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
f'rcvcntion, Atlanta, Georgia.

f.isa A. Daily, Assistant Director for Planning,
f:valuation, and Legislation, National Center for
(:hronic Disease Prevention and Health Promotion,
(:cntcrs for Disease Control and Prevention,
)\tlanta, Georgia.

Marjorie A. Speers, Ph.D., Behavioral and Social
\cicnccs Coordinator, Office of the Director,
(lormcrly, Director, Division of Chronic Disease
(:oritrol and Community Intervention, National
(:ctircr for Chronic Disease Prevention and Health
Promotion), Centers for Disease Control and
f'rcvention, Atlanta, Georgia.

f:rcclerick L. Trowbridge, M.D., Director, Division of
Nutrition and Physical Activity, National Center for
Chronic Disease Prevention and Health Promotion,
Ccmcrs for Disease Control and Prevention, Atlanta,
Georgia.

l'lorcnce Griffith Joyner, Co-Chair, President's
C:ouncil on Physical Fitness and Sports, Washington,
D.C.

C. Thomas McMillen, Co-Chair, President's Council
on Physical Fitness and Sports, Washington, D.C.
5lmh-a P. Perlmutter, Executive Director, President's
Council on Physical Fitness and Sports, Washington,
D.C.

Editorial Board

Carl J. Caspersen, Ph.D., Epidemiologist, Division
of Nutrition and Physical Activity, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Aaron R. Folsom, M.D., M.P.H., Professor, Division
of Epidemiology, School of Public Health, University
of Minnesota, Minneapolis, Minnesota.

vii


A Report of the Surgeon General

William L. Haskell, Ph.D., Professor of Medicine,
Stanford University, Palo Alto, California.

Arthur S. Leon, M.D., M.S., Henry L. Taylor Professor
and Director of the Laboratory of Physiological
Hygiene and Exercise Science, Division of Kinesiology,
University of Minnesota, Minneapolis, Minnesota.

James F. Sallis, Jr., Ph.D., Professor, Department of
Psychology, San Diego State University, San Diego,
California.

Martha L. Slattery, Ph.D., M.P.H., Professor,
Department of Oncological Sciences, University of
Utah Medical School, Salt Lake City, Utah.

Christine G. Spain, `M.A., Director, Research,
Planning, and Special Projects, President's Council
on Physical Fitness and Sports, Washington, D.C.

Jack H. Wilmore, Ph.D., Professor, Department of
Kinesiology and Health Education, University of
Texas at Austin, Austin, Texas.

Planning Board

Terry L. Bazzarre, Ph.D., Science Consultant,
American Heart Association, Dallas, Texas.

Steven N. Blair, P.E.D., Senior Scientific Editor,
Director of Research and Director, Epidemiology and
Clinical Applications, The Cooper Institute for
Aerobics Research, Dallas, Texas.

Willis R. Foster, M.D., Office of Disease Prevention
and Technology Transfer, National Institute of
Diabetes and Digestive and Kidney Diseases, National
Institutes of Health, Bethesda, Maryland.

Patty Freedson, Ph.D., Department of Exercise
Science, University of Massachusetts, Amherst,
Massachusetts. Represented the American Alliance
for Health, Physical Education, Recreation and Dance.

William R. Harlan, M.D., Associate `Director for
Disease Prevention, Office of the Director, National
Institutes of Health, Bethesda, Maryland.

James A. Harrell, M.A., Deputy Commissioner,
Administration on Children, Youth, and Families,
(formerly, Deputy Director, Office of Disease
Prevention and Health Promotion, Office of the
Assistant Secretary for Health, Department of Health
and Human Services), Washington, D.C.

Richard W. Lymn, Ph.D., Muscle Biology Branch,
National Institute of Arthritis and Musculoskeletal
and Skin Diseases, National Institutes of Health,
Bethesda, Maryland.

Russell R. Pate, Ph.D., Chairman, Department of
Exercise Science, University of South Carolina,
Columbia, South Carolina. Represented the American
College of Sports Medicine.

Sandra P. Perlmutter, Executive Director, President's
Council on Physical FitnessandSports, Washington,
D.C.

Bruce G. Simons-Morton, Ed.D., M.P.H., Behavioral
Scientist, Prevention Research Branch, National
Institute of Child Health and Human Development,
National Institutes of Health, Bethesda, Maryland.

Denise G. Simons-Morton, M.D., Ph.D., Leader,
Prevention Scientific Research Group, DECA,
National Heart, Lung, and Blood Institute, National
Institutes of Health, Bethesda, Maryland.

Contributing Authors

Lynda A. Anderson, Ph.D., Public Health Educator,
Division of Adult and Community Health, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Carol C. Ballew, Ph.D., Epidemiologist, Division of
Nutrition and Physical Activity, National Center for
Chronic Disease Prevention and Health Promotion,
Centers for Disease Control and Prevention, Atlanta,
Georgia.

Jack W. Berryman, Ph.D., Professor, Department of
Medical History and Ethics, School of Medicine,
University of Washington, Seattle, Washington.

Lawrence R. Brawley, Ph.D., Professor, University of
Waterloo, Ontario, Canada.

David R. Brown, Ph.D., Health Scientist, Division of
Nutrition and Physical Activity, National Center for
Chronic Disease Prevention and Health Promotion,
Centers for Disease Control and Prevention, Atlanta,
Georgia.

.
VIII


Physical Activity and Health

Lee S. CupIan, M.D., Ph.D., Medical Epidemiologist,
Epidcruiology and Statistics Branch, Division of
C&lnccr prevention and Control, National Center for
Cllronic Disease Prevention and Health Promotion,
Ccntcrs for Disease Control and Prevention, Atlanta,
Georgia.

R,+h J. Coatcs, Ph.D., Chief, Epidemiology Section,
Division of Cancer Prevention and Control, National
ccntcr for Chronic Disease Prevention and Health
f'romotion, Centers for Disease Control and
frcvcntion, Atlanta, Georgia.

C,lrlos J. Crespo, Dr.P.H., M.S., F.A.C.S.M., Public
flculth Analyst, National Heart, Lung, and Blood
Itlstitutc, National Institutes of Health, Bethesda,
Xlaryland.

I.orctta DiPietro, Ph.D., M.P.H., Assistant Fellow
and Assistant Professor of Epidemiology and
I'ublic Health, The John B. Pierce Laboratory and
Y;IIC University School of Medicine, New Haven,
(;onnccticut.

124 K. Dishman, Ph.D., Professor, Department of
f:scrcisc Science, University of Geoigia, Athens,
Georgia.

Michael M. Engelgau, M.D., Chief, Epidemiology
:~nd Statistics Branch, Division of Diabetes
Translation, National Center for Chronic Disease
I'rcvcntionand Health Promotion, Centers for Disease
(:ontrol and Prevention, Atlanta, Georgia.

\Valtcr H. Ettinger, M.D., Professor, Internal Medicine
and Public Health Sciences, Bowman Gray School of
Medicine, Winston-Salem, North Carolina.

David S. Freedman, Ph.D., Epidemiologist, Division
of Nutrition and Physical Activity, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Frederick Fridinger, Dr.P.H., C.H.E.S.., Public Health
Educator, Division of Nutrition and Physical
Activity, National Center for Chronic Disease
Prevention and Health Promotion, Centers for
Disease Control and Prevention, Atlanta, Georgia.

Gregory W. Heath, D.Sc., M.P.H., Epidemiologist/
Exercise Physiologist, Division of Adult and
Community Health, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta, Georgia.

Wendy A. Holmes, M.S., Health Communications
Specialist, Division of Nutrition and Physical
Activity, National Center for Chronic Disease
Prevention and Health Promotion, Centers for
~Disease Control and Prevention, Atlanta, Georgia.

Elizabeth H. Howze, Sc.D., Associate Director for
Health Promotion, Division* of Nutrition and
Physical Activity, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta,
Georgia.

Laura K. Kann, Ph.D., Chief, Surveillance Research
Section, Division of Adolescent and School Health,
National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Abby C. King, Ph.D., Assistant Professor of Health
Research and Policy and Medicine, Stanford
University School of Medicine, Palo Alto, California.

Harold W. Kohl, III, Ph.D., Director of Research,
Baylor College of Medicine, Baylor Sports Medicine
Institute, Houston, Texas.

Jeffrey P. Koplan, M.D., M.P.H., President, Prudential
Center for Health Care Research, Atlanta, Georgia.

Andrea M. Kriska, Ph.D., M.S., Assistant Professor,
Department of Epidemiology, Graduate School of
Public Health, University of Pittsburgh, Pittsburgh,
Pennsylvania.

Barbara D. Latham, R.D., M.P.H., Public Health
Nutritionist, Division of Nutrition and Physical
Activity, National Center for Chronic Disease
Prevention and Health Promotion, Centers for
Disease Control and Prevention, Atlanta, Georgia.

I-Min Lee, M.B.B.S., Sc.D., Assistant Professor
of Medicine, Harvard Medical School, Boston,
Massachusetts.

ix


A Report of the Surgeon General

Elizabeth Lloyd, M.S., Statistician, Division of
Nutrition and Physical Activity, National Center for
Chronic Disease Prevention and Health Promotion,
Centers for Disease Control and Prevention, Atlanta,
Georgia.

Bess H. Marcus, Ph.D., Associate Professor of
Psychiatry and Human Behavior, Division of Behavior
and Preventive Medicine, Miriam Hospital and Brown
University School of Medicine, Providence, Rhode
Island.

DyannMatson-Koffman,Dr.P.H.,M.P.H., C.H.E.S.,
Public Health Educator, Division of Adult and
Community Health, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease ControI and Prevention, Atlanta,
Georgia.

Marion R. Nadel, Ph.D., Epidemiologist, Epidemiology
and Statistics Branch, Division of Cancer Prevention
and Control, National Center for Chronic Disease
Preventionand Health Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

Eva Obarzanek, Ph.D., M.P.H., R.D., Nutritionist,
National Heart, Lung, and Blood Institute, National
Institutes of Health, Bethesda, Maryland.

Christine M. Plepys, M.S., Health Statistician, Division
of Health Promotion Statistics, National Center for
Health Statistics, Centers for Disease Control and
Prevention, Hyattsville, Maryland.

Michael L. Pollock, Ph.D., Professor of Medicine,
Physiology and Health and Human Performance;
Director, Center for Exercise Science, University of
Florida, Gainesville, Florida.

Michael Pratt, M.D., M.P.H., Medical Epidemiologist,
Division of Nutrition and Physical Activity, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Paul T. Raford;M.D., M.P.H.,Special Assistant to the
Regional Health Administrator, Environmental
Justice Programs, Office of Public Health Science,
Region VIII, Department of Health and Human
Services, U.S. Public Health Service, Denver,
Colorado.

W. Jack Rejeski, Ph.D., Professor, Health and Sports
Science, Wake Forest University, Winston-Salem,
North Carolina.

Richard B. Rothenberg, M.D., M.P.H., F.A.C.P.,
Professor and Director, Preventive Medicine
Residency Program, Department of Family and
Preventive Medicine, Emory University School of
Medicine, Atlanta, Georgia.

Mary K. Serdula, M.D., M.P.H., Acting Branch Chief,
Chronic Disease Prevention Branch, Division of
Nutrition and Physical Activity, National Center for
Chronic Disease Prevention and Health Promotion,
Centers for Disease Control and Prevention, Atlanta,
Georgia.

Charlotte A. Schoenborn, M.P.H., Health Statistician,
National Center for Health Statistics, Centers for
Disease Control and Prevention, Hyattsville,
Maryland.

Denise G. Simons-Morton, M.D., Ph.D., Leader,
Prevention Scientific Research Group, DECA,
National Heart, Lung, and Blood Institute, National
Institutes of Health, Bethesda, Maryland.

Elaine J. Stone, Ph.D., M.P.H., Health Scientist
Administrator, Division of Epidemiology and Clinical
Applications, National Heart, Lung, and Blood
Institute, National Institutes of Health, Bethesda,
Maryland.

Marlene K. Tappe, Ph.D., Visiting Behavioral
Scientist, Division of Adolescent and School Health,
National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Wendell C. Taylor, Ph.D., M.P.H., Assistant Professor
of Behavioral Sciences, School of Public Health,
University of Texas Health Science Center at Houston,
Houston, Texas.

CharlesW. Warren, Ph.D., Statistician/Demographer,
Division of Adolescent and School Health, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Deborah R. Young, Ph.D., Assistant Professor of
Medicine, Division of Internal Medicine, The Johns
Hopkins School of Medicine, Baltimore, Maryland.

X


Physical Activity and Health

Senior Reviewers

Elizabeth A. Arendt, M.D., Associate Professor of
Orthopaedics, University of Minnesota, Minneapolis,
>jtnnesota. Member, President's Councilon Physical
Fitness and Sports.

Elsworth R. Buskirk, Ph.D., Professor of Applied
Physiology, Emeritus, Pennsylvania State University,
University Park, Pennsylvania.

B. Don Franks, Ph.D., Professor and Chair,
Department of Kinesiology, Louisiana State
University, Baton Rouge, Louisiana. Senior Program
Advisor, President's Council on Physical Fitness
and Sports.

\Villiam R. Harlan, M.D., Associate Director for
Disease Prevention, Office of the Director, National
Institutes of Health, Bethesda, Maryland.

William P. Morgan, Ed.D., Professor, Department of
Kincsiology, University of Wisconsin-Madison,
Madison, Wisconsin.

Ralph S. Paffenbarger,Jr., M.D., Dr.P.H., Professor of
Epidemiology (Retired-Active), Stanford University
School of Medicine, Stanford, California.

Russell R. Pate, Ph.D., Chairman, Department of
Escrcise Science, University of South Carolina,
cIolumbia,SouthCarolina. Represented the American
(:ollcge of Sports Medicine.

Roy J. Shephard, M.D., Ph.D., D.P.E., F.A.C.S.M.,
Professor EmeritusofApplied Physiology, University
of Toronto, Toronto, Canada.

Peer Reviewers

Barbara E. Ainsworth, Ph.D., M.P.H., Associate
Professor, Department of Epidemiology and
Biosratistics, Department ofExercise Science, School
of Public Health, University of South Carolina,
Columbia, South Carolina.

Tom Baranowski, Ph.D., Professor, Department of
Behavioral Science, University of Texas, M. D.
.-\nderson Cancer Center, Houston, Texas.

Oded Bar-Or, M.D., Professor of Pediatrics and
Director, Children's Exercise and Nutrition Centre,
McMaster University, Chedoke Hospital Division,
Hamilton, Ontario, Canada.

Charles B. Corbin, Ph.D., Professor, Department of
Exercise Science and Physical Education, Arizona
State University, Tempe, Arizona.

Kirk J. Cureton, Ph.D., Professor and Head,
Department of Exercise Science, University of
Georgia, Athens, Georgia.

Gail P. Dalsky, Ph.D., Assistant Professor ofMedicine
(in residence), University of Connecticut Health
Center, Farmington, Connecticut.

Nicholas A. DiNubile, M.D., Clinical Assistant
Professor, Department of Orthopaedic Surgery,
Hospital of the University of Pennsylvania; Chief,
Orthopaedic Surgery and Sports Medicine, Delaware
County Memorial Hospital, Drexel Hill, Pennsylvania.

BarbaraL. Drinkwater, Ph.D., Research Physiologist,
Pacific Medical Center, Seattle, Washington.

Andrea L. Dunn, Ph.D., Associate Director, Division
of Epidemiology and Clinical Applications, The
Cooper Institute for Aerobics Research, Dallas, Texas.

Leonard H. Epstein, Ph.D., Professor, Department of
Psychology, State University of New York at Buffalo,
Buffalo, New York.

Katherine M. Flegal, Ph.D., Senior Research
Epidemiologist, National Center for Health Statistics,
Centers for Disease Control and Prevention,
Hyattsville, Maryland.

Christopher D. Gardner, Ph.D., Research Fellow,
Stanford Center for Research in Disease Prevention,
Stanford University, Palo Alto, California.

Glen G. Gilbert, Ph.D., Professor and Chairperson,
Department of Health Education, University of
Maryland, College Park, Maryland.

Andrew P. Goldberg, M.D., Professor of Medicine
and Director, Division of Gerontology, University of
Maryland School of Medicine, Baltimore, Maryland.

John 0. Holloszy, M.D., Professor of Internal
Medicine, Washingtonuniversity SchoolofMedicine,
St. Louis, Missouri.

Melbourne F. Hovell, Ph.D., M.P.H., Professor of
Health Promotion; Director, Center for Behavioral
Epidemiology, Graduate School of Public Health,
College of Health and Human Services, San Diego
State University, San Diego, California.

xi


A Report of the Surgeon General

Caroline A. Macera, Ph.D., Director, Prevention
Center, School of Public Health, University of South
Carolina, Columbia, South Carolina.

JoAnn E. Manson, M.D., Dr.P.H., Co-Director of
Women's Health, Brigham and Women's Hospital,
Harvard Medical School, Boston, Massachusetts.

Jere H. Mitchell, M.D., Professor of Internal Medicine
and Physiology; Director, Harry S. Moss Heart Center,
University of Texas Southwestern Medical Center,
Dallas, Texas.

James R. Morrow, Jr., Ph.D., Professor and Chair,
Department of KHPR, University of North Texas,
Denton, Texas.

Neville Owen, Ph.D., Professor of Human Movement
Science, Deakin University, Melbourne, Australia.
Roberta J. Park, Ph.D., Professor of the Graduate
School, University of California, Berkeley, California.

Peter B. Raven, Ph.D., Professor and Chair,
Department of Integrative Physiology, University of
North Texas Health Science Center, Fort Worth,
Texas.

Judith G. Regensteiner, Ph.D., Associate Professor of
Medicine, University of Colorado Health Sciences
Center, Denver, Colorado.

Bruce G. Simons-Morton, Ed.D., M.P.H., Behavioral
Scientist, Prevention Research Branch, National
Institute of Child Health and Human Development,
National Institutes of Health, Bethesda, Maryland.

Denise G. Simons-Morton, M.D., Ph.D., Leader,
Prevention Scientific Research Group, DECA,
National Heart, Lung, and Blood Institute, National
Institutes of Health, Bethesda, Maryland.

James S. Skinner, Ph.D., Professor, Department of
Kinesiology, Indiana University, Bloomington,
Indiana.

Thomas Stephens, Ph.D., Principal, Thomas Stephens
and Associates, Ottawa, Canada.

Anita Stewart, Ph.D., Associate Professor in
Residence, University of California, San Francisco,
San Francisco, California.

C. Barr Taylor, M.D., Professor of Psychiatry,
Department of Psychiatry and Behavioral Sciences,
Stanford University School of Medicine, Stanford,
California.

Charles M. Tipton, Ph.D., F.A.C.S.M., Professor of
Physiology and Surgery, University of Arizona,
Tucson, Arizona.

Zung Vu Tran, Ph.D., Senior Research Scientist,
Center for Research in Ambulatory Health Care
Administration, Englewood, Colorado.

Other Contributors

Melissa M. Adams, Ph.D., Assistant Director for
Science, Division of Reproductive Health, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Indu Ahluwalia, M.P.H., Ph.D., EISOfficer, Division
of Nutrition and Physical Activity, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Betty A. Ballinger, Technical Information Specialist,
Technical Information and Editorial Services Branch,
National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Sandra W. Bart, Policy Coordinator, Office of the
Secretary, Executive Secretariat, Department of
Health and Human Services, Washington, D.C.

Mary Bedford, Proofreader, Cygnus Corporation,
Rockville, Maryland.

Caryn Bern, M.D., Medical Epidemiologist, Division
of Nutrition and Physical Activity, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Karil Bialostosky, M.S., Nutrition Fellow, National
Center for Health Statistics, Centers for Disease
Control and Prevention, Hyattsville, Maryland.

xii


Physical Activity and Health

Thomas E. Blakeney, Program Analyst, National
Center for Injury Prevention and Control, Centers
for Disease Control and Prevention, Atlanta,
Georgia.

Ronctte R. Briefel, Dr.P.H.. Nutrition Policy Advisor,
National Center for Health Statistics, Centers for
Disease Control and Prevention, Hyattsville,
htaryland.

L. Diane Clark, M.P.H., Public Health Nutritionist,
Division of Nutrition and Physical Activity, National
Ccntcr for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

jancl L. Coil' Ins, Ph.D., Chief, Surveillance and
Evaluation Research Branch, Division of Adolescent
and School Health, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta,
Georgia.

Janet B. Croft, Ph.D.,Epidemiogist,DivisionofAdult
;tnd Community Health, National Center for Chronic
Discasc Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta,
Georgia.

Ann M. Cronin, Program Analyst, National Institute
for Occupational Safety and Health, Centers for
Discase Control and Prevention, Atlanta, Georgia.

(iail A. Cruse, M.L.I.S., Technical Information
Specialist, Technical Information and Editorial
Scrviccs Branch, National Center for Chronic Disease
Prcventionand Health Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

John M. Davis, M.P.A., R.D., Public Health Analyst,
Division of Nutrition and Physical Activity, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Earl S. Ford, M.D., M.P.H., Senior Scientist, Division
of Nutrition and Physical Activity, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Christine S. Fralish, M.L.I.S., Chief, Technical
Information and Editorial Services Branch, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Emma L. Frazier, Ph.D., Mathematical Statistician,
Division of Diabetes Translation, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Deborah A. Galuska, M.P.H., Ph.D., EIS Fellow,
Division of Nutrition and Physical Activity, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Dinamarie C. Garcia, M.P.H., C.H.E.S., Intern,
Division of Nutrition and Physical Activity, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Linda S. Geiss, M.A., Health Statistician, Division of
Diabetes Translation, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta, Georgia.

Wayne H. Giles, M.D., M.S., Epidemiologist,
Cardiovascular Health Section, Division of Adult
and Community Health, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta, Georgia.

Kay Sissions Golan, Public Affairs Specialist, Office
of Communication (proposed), Centers for Disease
Control and Prevention, Atlanta, Georgia.

Betty H. Haithcock, Editorial Assistant, Technical
Information and Editorial Services Branch, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Helen P. Hankins, Writer-Editor, Technical
Information and Editorial Services Branch, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

. . .
XIII


A Report of the Surgeon General

Rita Harding, Graphic Designer, Cygnus Corporation,
Rockville, Maryland.

William A. Harris, M.M., Computer Specialist,
Division of Adolescent and School Health, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Charles G. Helmick, III, M.D., Division of Adult and
Community Health, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta, Georgia.

Elizabeth L. Hess, Technical Editor, Cygnus
Corporation, Rockville, Maryland.

Mary Ann Hill, M.P.P., Director of Communications,
President's Council on Physical Fitness and Sports,
Washington, D.C.

Thomya L. Hogan, Proofreader, Cygnus Corporation,
Rockville, Maryland.

Judy F. Horne, Technical Information Specialist,
Technical Information and Editorial ServicesBranch,
National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Catherine A. Hutsell, M.P.H., Public Health Educator,
Division of Adult and Community Health, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Robert Irwin, Special Assistant, Office of the Director,
Centers for Disease Control and Prevention,
Washington, D.C.

Sandra E. Jewell, MS., Statistician, Division of
Nutrition and Physical Activity, National Center for
Chronic Disease Prevention and Health Promotion,
Centers for Disease Control and Prevention, Atlanta,
Georgia.

Loretta G. Johnson, Secretary, Division of Nutrition
and Physical Activity, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta, Georgia.

Deborah A. Jones, Ph.D., Epidemiologist, Division
of Nutrition and Physical Activity, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Wanda K. Jones, M.P.H., Dr.P.H., Associate Director
for Women's Health, Office of Women's Health,
Centers for Disease Control and Prevention, Atlanta,
Georgia.

Robert E. Keaton, Consultant, Cygnus Corporation,
Rockville, Maryland.

Delle B. Kelley, Technical Information Specialist,
Technical Information and Editorial ServicesBranch,
National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Mescal J. Knighton, Writer-Editor, Technical
Information and Editorial Services Branch, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Sarah B. Knowlton, J.D., M.S.W., Attorney Advisor,
Office of the General Council, Centers for Disease
Control and Prevention, Atlanta, Georgia.

FredKroger,ActingDirector,HealthCommunication,
Office of Communication (proposed), Centers for
Disease Control and Prevention, Atlanta, Georgia.

Sarah A. Kuester, M.P.H., R.D., Public Health
Nutritionist, Division of Nutrition and Physical
Activity, National Center for Chronic Disease
Prevention and Health Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

Becky H. Lankenau, M.S., R.D., M.P.H., Dr.P.H.,
Public Health Nutritionist, Division of Nutrition and
Physical Activity, National Center for Chronic Disease
Prevention and Health Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

Nancy C. Lee, M.D., Associate Director for Science,
Division of Cancer Prevention and Control, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

xiv


Physical Activity and Health

Leandris C. Liburd, M.P.H., Public Health Educator,
Division of Diabetes Translation, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Richard Lowry, M.D., M.S., Medical Epidemiologist,
Division of Adolescent and School Health, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Salvatore J. Lucido, M.P.A., Program Analyst,
National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and
Prevention, Atlanta,, Georgia.

Gene W. Matthews, Esq., Legal Advisor to CDC and
ATSDR, Office of the General Council, Centers for
Disease Control and Prevention, Atlanta, Georgia.

Urcnda W. Mazzocchi, M.S.L.S., Technical
Information Specialist, Technical Information and
Editorial Services Branch, National Center for
Chronic Disease Prevention and Health Promotion,
Ccntcrs for Disease Control and Prevention, Atlanta,
(icorgia.

Sharon McDonnell, M.D., M.P.H., Medical
Ilpidcmiologist, Division of Nutrition and Physical
:\ctivity, National Center for Chronic Disease
I'rcvcntionand Health Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

Michael A. McGeehin, Ph.D., M.S.P.H., Chief, Health
9udics Branch, Division of Environmental Hazards
and Health Effects, National Center for Environmental
1 icalth, Centers for Disease Control and Prevention,
Atlanta, Georgia.

ZU~UO Mei, M.D., M.P.H. Visiting Scientist, Division
of Nutrition and Physical Activity, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease . Control and
Prcvcntion, Atlanta, Georgia.

lames M. Mendlein, Ph.D., Epidemiologist, Division
of Nutrition and Physical Activity, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
frcvenlion, Atlanta, Georgia.

Robert K. Merritt, M.A., Behavioral Scientist, Office
on Smoking and Health, National Center for Chronic
,Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta,
Georgia.

Gaylon D. Morris, M.P.P., Program Analyst, Office
of Program Planning and Evaluation, Centers for
Disease Control and Prevention, Atlanta, Georgia.

Melba Morrow, M.A., Division Manager, The Cooper
Institute for Aerobics Research, Dallas, Texas.

Marion R. Nadel, Ph.D., Epidemiologist, Division of
Cancer Prevention and Control, National Center for
Chronic Disease Prevention and Health Promotion,
Centers for Disease Control and Prevention, Atlanta,
Georgia.

David E. Nelson, M.D., M.P.H., Medical Officer,
Division of Adult and Community Health, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Reba A. Norman, M.L.M., Technical Information
Specialist, Technical Information and Editorial
Services Branch, National Center for Chronic Disease
Prevention andHealth Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

Ward C. Nyholm, Graphic Designer, Cygnus
Corporation, Rockville, Maryland.

Stephen M. Ostroff, M.D., Associate Director for
Epidemiologic Science, National Center for Infectious
Diseases, Centers for Disease Control and Prevention,
Atlanta, Georgia.

Ibrahim Parvanta, MS., Acting Deputy Chief,
Maternal and Child Health Branch, Division of
Nutrition and Physical Activity, National Center for
Chronic Disease Prevention and Health Promotion,
Centers for Disease Control and Prevention, Atlanta,
Georgia.

Terry F. Pechacek, Ph.D., Visiting Scientist, Office
on Smoking and Health, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta, Georgia.

xv


A Report of the Surgeon General

Geraldine S. Perry, Dr.P.H., Epidemiologist, Division
of Nutrition and Physical Activity, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Todd M. Phillips, M.S., Deputy Project Director,
Cygnus Corporation, Rockville, Maryland.

Audrey L. Pinto, Writer-Editor, Technical
Information and Editorial Services Branch, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Kenneth E. Powell, M.D., M.P.H., Associate Director
for Science, Division of Violence Prevention, National
Center for Injury Prevention and Control, Centers
for Disease Control and Prevention, Atlanta,Georgia.

Julia H. Pruden, M.Ed., R.D., Public Health
Nutritionist, Division of Nutrition and Physical
Activity, National Center for Chronic Disease
Prevention and Health Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

David C. Ramsey, M.P.H., Public Health Educator,
Division of Nutrition and Physical Activity, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Brenda D. Reed, Secretary, Division of Adult and
Community Health, National Center for Chronic
Disease Prevention and Health Promotion, Centers
for Disease Control and Prevention, Atlanta, Georgia.

Susan A. Richardson, Writer-Editor, Cygnus
Corporation, Rockville, Maryland.

Christopher Rigaux, Project Director, Cygnus
Corporation, Rockville, Maryland.

Angel Rota, Program Analyst, National Center for
Chronic Disease Prevention and Health Promotion,
Centers for Disease Control and Prevention, Atlanta,
Georgia.

Cheryl V. Rose, Computer Specialist, Division of
Health Promotion Statistics, National Center for
Health Statistics,. Centers for Disease Control and
Prevention, Hyattsville, Maryland.

Patti Schwartz, Graphic Designer, Cygnus Corporation,
Rockville, Maryland.

Bettylou Sherry, Ph.D., Epidemiologist, Maternal
and Child Health Branch, Division of Nutrition and
Physical Activity, National Center for Chronic Disease
Prevention and Health Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

Margaret Leavy Small, Behavioral Scientist, Division
of Adolescent and School Health, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia

Joseph B. Smith, Senior Project Officer, Disabilities
Prevention Program, National Center for
Environmental Health, Centers for Disease Control
and Prevention, Atlanta, Georgia.

Terrie D. Sterling, Ph.D., Research Psychologist,
Division of Adult and Community Health, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Emma G. Stupp, M.L.S., Technical Information
Specialist, Technical Information and Editorial
ServicesBranch, National Center for Chronic Disease
Prevention and Health Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

William I. Thomas, M.L.I.S., Technical Information
Specialist, Technical Information and Editorial
Services Branch, National Center for Chronic Disease
Prevention and Health Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

Patricia E. Thompson-Reid, M.A.T., M.P.H.,
Program Development Consultant/Community
Interventionist, Division of Diabetes Translation,
National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Jenelda Thornton, Staff Specialist, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

xvi


Physical Activity and Health

Nancy B. Watkins, M.P.H., Health Education
Specialist, Division of Adult and Community Health,
National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Howell Wechsler, Ed.D., M.P.H., Health Education
Research Scientist, Division of Adolescent and School
Health, National Center for Chronic Disease
Preventionand Health Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

Julie C. Will, Ph.D., M.P.H., Epidemiologist, Division
of Nutrition and Physical Activity, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Lynda S. Williams, Program. Analyst, National
Center for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

David F. Williamson, Ph.D., Acting Director,
Division of Diabetes Translation, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia.

Stephen W. Wyatt, D.M.D., M.P.H., Director, Division
of Cancer Prevention and Control, National Center
for Chronic Disease Prevention and Health
Promotion, Centers for Disease Control and
Prevention, Atlanta, Georgia,

Matthew M. Zack, M.D.; M.P.H., Medical
Epidemiologist, Division of Adult and Community
Health, National Center for Chronic Disease
Prevention andHealth Promotion, Centers for Disease
Control and Prevention, Atlanta, Georgia.

xvii


PHYSICAL ACTIVITV AND HEALTH

Chapter 1: Introduction, Summary, and Chapter Conclusions   ....................... 1
Chapter 2: Historical Background, Terminology, Evolution of Recommendations
andbleasurement   .......................................................... 9

Western Historical Perspective  ............................................... .12
Terminology of Physical Activity, Physical Fitness, and Health  ..................... .2O
Evolution of Physical Activity Recommendations  .................................. 22
Summary of Recent Physical Activity Recommendations ........................... .28
Measurement of Physical Activity, Fitness, and Intensity  .......................... .29
Chapter 3: Physiologic Responses and Long-Term Adaptations to Exercise  ............ .61
Physiologic Responses to Episodes of Exercise  .................................. .61
Long-Term Adaptations to Exercise Training .................................... .67
Maintenance, Detraining, and Prolonged Inactivity  ............................... .71
Special Considerations  ..................................................... .73

Chapter 4: The Effects of Physical Activity on Health and Disease  ................... .81
Overall Mortality  ........................................................... .85

  Cardiovascular Diseases  .................................................... .87

  Cancer ................................................................ ..112
Non-Insulin-Dependent Diabetes Mellitus ..................................... .125

  Osteoarthritis                                                .129
                ................. , ..........................................
  Osteoporosis ........................................................... ..13 0
Obcsity..................................................................13 3
  McntalHealth .......................................................... ..13 5
  Health-Related Quality of Life ............................................... .141
  Adverse Effects of Physical Activity  .......................................... .142
  Occurrence of Adverse Effects  .............................................. .144
  Nature of the Activity/Health Relationship  ..................................... .144

Cllaptcr 5: Patterns and Trends in Physical Activity  ............................... 173
  Physical Activity among Adults in the United States  ............................. .177
Physical Activity among Adolescents and Young Adults in the United States  ........... 186

Chapter 6: Understanding and Promoting Physical Activity   ....................... ,209
  Theories and Models Used in Behavioral and Social Research on
   PhysicalActivity.. .................................................... ..211
  Behavioral Research on Physical Activity among Adults  .......................... .215
Behavioral Research on Physical Activity among Children and Adolescents  ........... .234
  Promising Approaches, Barriers, and Resources  ................................. .243
List of Tables and Figures   ................................................... .261

Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...265