Journal of Applied Physiology AJP: Cell Physiology
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J Appl Physiol 90: 461-468, 2001;
8750-7587/01 $5.00
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Vol. 90, Issue 2, 461-468, February 2001

Effect of muscle mass on VO2 kinetics at the onset of work

Shunsaku Koga1, Thomas J. Barstow2, Tomoyuki Shiojiri3, Tetsuo Takaishi4, Yoshiyuki Fukuba5, Narihiko Kondo6, Manabu Shibasaki6, and David C. Poole2

1 Applied Physiology Laboratory, Kobe Design University, Kobe 651-2196; 3 Yokohama City University, Yokohama 236-0027; 4 Nagoya City University, Nagoya 467-8501; 5 Hiroshima Women's University, Hiroshima 734-8558; 6 Kobe University, Kobe 657-0011, Japan; and 2 Department of Kinesiology, Kansas State University, Manhattan, Kansas 66506-0302

The dependence of O2 uptake (VO2) kinetics on the muscle mass recruited under conditions when fiber and muscle recruitment patterns are similar following the onset of exercise has not been determined. We developed a motorized cycle ergometer that facilitated one-leg (1L) cycling in which the electromyographic (EMG) profile of the active muscles was not discernibly altered from that during two-leg (2L) cycling. Six subjects performed 1L and 2L exercise transitions from unloaded cycling to moderate [<ventilatory threshold (VT)] and heavy (>VT) exercise. The 1L condition yielded kinetics that was unchanged from the 2L condition [the phase 2 time constants (tau 1, in s) for <VT were as follows: 1L = 16.8±8.4 (SD), 2L = 18.4 ± 8.1, P > 0.05; for >VT: 1L = 26.8 ± 12.0; 2L = 27.8 ± 16.1, P > 0.05]. The overall VO2 kinetics (mean response time) was not significantly different for the two exercise conditions. However, the gain of the fast component (the amplitude/work rate) during the 1L exercise was significantly higher than that for the 2L exercise for both moderate and heavy work rates. The slow-component responses evident for heavy exercise were temporally and quantitatively unaffected by the 1L condition. These data demonstrate that, when leg muscle recruitment patterns are unchanged as assessed by EMG analysis, on-transient VO2 kinetics for both moderate and heavy exercise are not dependent on the muscle mass recruited.

exercise energetics; one-leg exercise; pulmonary gas exchange; muscle recruitment; control of muscle oxygen uptake


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