at termination of exercise , all three groups exhibited similar marked levels of leg o2 extraction ( % ) ( a , 80 +/- 2 ; b , 83 +/- 3 ; c , 89 +/- 1 ) and high femoral-arterial lactate gradients ( mg/dl ) ( a , 15.4 +/- 2.6 ; b , 18.3 +/- 3.5 ; c , 19.2 +/- 3.6 ) , suggesting that exercise was limited when a critical level of muscle underperfusion was reached .
C0023216
leg
C0015811
femoral