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Muscle mass as a factor limiting physical work.

R J Shephard1, E Bouhlel, H Vandewalle

  • 1Laboratoire de Physiologie du Travail, CHU Pitié Salpetrière, Paris, France.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 1, 1988
PubMed
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Aerobic exercise performance in men and women is proportional to active muscle mass. Reduced oxygen (O2) availability significantly impacts leg exercise but not arm exercise.

Area of Science:

  • Exercise Physiology
  • Human Performance
  • Cardiovascular Regulation

Background:

  • Sex differences exist in oxygen (O2) transport and power output during maximal exercise.
  • Aerobic performance is influenced by the volume of active muscle mass.

Purpose of the Study:

  • To investigate sex-specific aerobic performance across different ergometer types.
  • To determine the relationship between active muscle volume and exercise performance.
  • To assess the impact of reduced oxygen availability (hypoxia) on exercise capacity.

Main Methods:

  • Maximal exercise tests were conducted on 16 participants (8 men, 8 women).
  • Four ergometer types were used: 2-leg, 1-leg, arm + shoulder, and arm.
  • Exercise was performed under normoxia (room air) and hypoxia (12% O2).

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  • Results were correlated with anthropometric estimates of active muscle mass.

    • Main Results:

    • Significant sex differences in O2 transport and power output were observed.
    • Aerobic performance generally scaled with active muscle volume across ergometer types.
    • Reduced oxygen (12% O2) substantially decreased 2-leg and 1-leg ergometry performance.
    • Hypoxia had a negligible effect on arm and arm + shoulder ergometry.

    Conclusions:

    • Exercise performance is largely dependent on active muscle mass, with sex-specific differences.
    • Two-leg ergometry is primarily limited by central circulatory O2 transport.
    • Arm ergometry performance is mainly limited by intrinsic muscle power, less by O2 transport.