Yasuda N, Gaskill S E, Ruby B C
Department of Health and Human Performance, The University of Montana, Missoula, MT, USA.
Scand J Med Sci Sports. 2008 Apr;18(2):205-12. doi: 10.1111/j.1600-0838.2007.00637.x. Epub 2007 May 9.
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 %VO2peak at T(vent) served as subjects. All subjects performed 5 min of exercise at each intensity of 70%, 85%, 100%, and 115% of T(vent) 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 %VO2peak at Tvent.
本研究的目的是确定男性和女性在以特定模式通气阈值（T(vent)）的70%、85%、100%和115%进行手摇曲柄运动（AC）和腿部骑行运动（LC）时的经济性和机械效率。T(vent)时%VO2峰值相似的休闲活跃男性（n = 9）和女性（n = 9）作为研究对象。所有研究对象在AC和LC运动中，均以T(vent)的70%、85%、100%和115%的每种强度进行5分钟的运动。经济性以瓦特/升/分钟表示。总效率（GE）确定为完成的功与总能量消耗的比值（%）。增量效率（DE）确定为完成的增量功与增量能量消耗的比值（%）。男性和女性在LC运动中的经济性和效率高于AC运动。在AC或LC运动期间，在经济性（AC时P = 0.93，LC时P = 0.98）、GE（AC时P = 0.88，LC时P = 0.75）或DE（AC时P = 0.57，LC时P = 0.51）方面均未发现性别差异。这些研究结果表明，当研究对象在Tvent时具有相似的%VO2峰值时，男性和女性在AC和LC运动中表现出相似的经济性和效率。
