Faster kinetics of VO2 during arm exercise with circulatory occlusion of the legs.
Occlusion of the nonworking leg muscles prior to the onset of supine arm exercise was examined for an effect on the kinetics of respiratory gas exchange (VO2 and VCO2), ventilation (VE), and heart rate (HR). Seven subjects performed arm cycling at 40 W (two females) or 50 W (five males) for 8 min following 4 min of "0" W pedaling. Six repetitions of each of uncuffed and cuffed leg conditions were averaged for individual subject analysis. The VO2 kinetics were significantly faster in the cuffed than the uncuffed condition (mean response time 66.0 +/- 26.4 vs 81.2 +/- 37.5 s, P less than 0.04). The kinetics of VCO2, VE, and HR were not affected by occlusion. It is concluded that the faster VO2 kinetics with the prior occlusion of nonworking leg muscles was a consequence of increased availability of oxygen to the working arm muscles at the onset of exercise.
Hughson
R L
RL
Imman
M D
MD
D000328:Adult; D001132:Arm / Q000098:blood supply / Q000502:physiology*; D001693:Biological Transport, Active; D001944:Breath Tests; D002245:Carbon Dioxide / Q000032:analysis; D005080:Exercise Test; D005260:Female; D006801:Humans; D007700:Kinetics; D007866:Leg / Q000098:blood supply*; D008026:Ligation; D008176:Lung Volume Measurements; D008297:Male; D008954:Models, Biological; D010100:Oxygen / Q000032:analysis*; D011659:Pulmonary Gas Exchange; D013997:Time Factors
D002245:Carbon Dioxide; D010100:Oxygen