No gender-specific differences in mechanical efficiency during arm or leg exercise relative to ventilatory threshold

N. Yasuda, S. E. Gaskill, B. C. Ruby

Research output: Contribution to journalArticlepeer-review

Abstract

The purpose of this study was to determine economy and mechanical efficiency in men and women during both arm cranking (AC) and leg cycling (LC) at 70%, 85%, 100%, and 115% of mode-specific ventilatory threshold (T vent). Recreationally active men (n=9) and women (n=9) with similar values for %V̇O2peak at Tvent served as subjects. All subjects performed 5 min of exercise at each intensity of 70%, 85%, 100%, and 115% of Tvent for both AC and LC. Economy was expressed as W/L/min. Gross efficiency (GE) was determined as the ratio of work accomplished to total energy expended (%). Delta efficiency (DE) was determined as the ratio of delta work accomplished to delta energy expended (%). Economy and efficiency during LC were greater than during AC in men and women. During AC or LC exercise, no sex differences were found in either economy (P=0.93 for AC, 0.98 for LC), GE (P=0.88 for AC, 0.75 for LC), or DE (P=0.57 for AC, 0.51 for LC). These findings indicate that men and women show similar economy and efficiency during both AC and LC exercise when subjects have similar %V̇O2peak at T vent.

Original languageEnglish
Pages (from-to)205-212
Number of pages8
JournalScandinavian Journal of Medicine and Science in Sports
Volume18
Issue number2
DOIs
StatePublished - Apr 2008

Keywords

  • Anaerobic threshold
  • Endurance performance
  • Muscle mass
  • Relative intensity
  • Sex-based differences

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