Rodgers SL, Siconolfi SF.
FASEB J. 1993 Feb 19; 7: A452.
Louisiana Tech U., Ruston.
AnC is expressed as the lactate (L), work (W) or power (P) produced during a short-term (30-90 s) exercise test. Correlations of W or P to peak L (or delta L peak-rest) range from poor (r=0.15) to acceptable (r=0.79) [0.61 +/- 0.20]. Estimating AnC from a GXT increases the efficiency of testing and decreases subject risk by eliminating a 2nd maximum exercise test. We developed and examined the validity of 2 estimates of AnC using variables (oxygen deficit & external P) from a GXT. AnC, expressed as W (AnC-W), average P (AnC-P), peak L, or delta L, was assessed using a 2nd treadmill test (1 min at 5 mph, then run to exhaustion at 8 mph and 20% grade). The treadmill GXT consisted of 3-min stages at 5, 6, and 7 mph, and then 3% increases in grade until volitional fatigue. Stepwise, multiple-regression estimates of AnC-W and AnC-P accounted for 86% and 90% of the variance in the measured AnC-W and AnC-P, respectively. Correlations of estimated AnC-W and AnC-P with L, delta L, and VO2max (mL/kg/min) in subjects (13M/2F, VO2max =52.7 +/- 9 ml/kg/min, age = 32.3 +/- 5.8 years, wt=74.2 +/- 14.9 kg) are shown below. [table: see text] The correlations between the estimated AnC-W and AnC-P versus peak L and delta L were similar to those observed for the measured values. Nonsignificant correlations with VO2max suggest these measures are not associated with aerobic capacity. Valid estimations of AnC-W and AnC-P can be obtained with variables derived from a GXT.
Publication Types:
Keywords:
- Exercise Test
- Fatigue
- Lactic Acid
- Regression Analysis
- Rest
- NASA Center JSC
- NASA Discipline Cardiopulmonary
- NASA Discipline Number 00-00
- NASA Program Flight
Other ID:
UI: 102212801
From Meeting Abstracts