McCartney N, Heigenhauser G J, Jones N L
J Appl Physiol Respir Environ Exerc Physiol. 1983 Jul;55(1 Pt 1):218-24. doi: 10.1152/jappl.1983.55.1.218.
We studied maximal torque-velocity relationships and fatigue during short-term maximal exercise on a constant velocity cycle ergometer in 13 healthy male subjects. Maximum torque showed an inverse linear relationship to crank velocity between 60 and 160 rpm, and a direct relationship to thigh muscle volume measured by computerized tomography. Peak torque per liter thigh muscle volume (PT, N X ml-1) was related to crank velocity (CV, rpm) in the following equation: PT = 61.7 - 0.234 CV (r = 0.99). Peak power output was a parabolic function of crank velocity in individual subjects, but maximal power output was achieved at varying crank velocities in different subjects. Fiber type distribution was measured in the two subjects showing the greatest differences and demonstrated that a high proportion of type II fibers may be one factor associated with a high crank velocity for maximal power output. The decline in average power during 30 s of maximal effort was least at 60 rpm (23.7 +/- 4.6% of initial maximal power) and greatest at 140 rpm (58.7 +/- 6.5%). At 60 rpm the decline in power over 30 s was inversely related to maximal oxygen uptake (ml X min-1 X kg-1) (r = 0.69). Total work performed and plasma lactate concentration 3 min after completion of 30-s maximum effort were similar for each crank velocity.
我们研究了13名健康男性受试者在恒速自行车测力计上进行短期最大运动时的最大扭矩-速度关系和疲劳情况。最大扭矩在60至160转/分钟之间与曲柄速度呈反比线性关系，与通过计算机断层扫描测量的大腿肌肉体积呈正比关系。每升大腿肌肉体积的峰值扭矩（PT，N×ml-1）与曲柄速度（CV，转/分钟）的关系如下式：PT = 61.7 - 0.234 CV（r = 0.99）。峰值功率输出在个体受试者中是曲柄速度的抛物线函数，但不同受试者达到最大功率输出时的曲柄速度各不相同。在两名差异最大的受试者中测量了纤维类型分布，结果表明高比例的II型纤维可能是与最大功率输出时的高曲柄速度相关的一个因素。在最大努力的30秒内，平均功率下降在60转/分钟时最小（为初始最大功率的23.7 +/- 4.6%），在140转/分钟时最大（为58.7 +/- 6.5%）。在60转/分钟时，30秒内功率的下降与最大摄氧量（ml×min-1×kg-1）呈反比关系（r = 0.69）。对于每个曲柄速度，30秒最大努力完成后3分钟内的总功和血浆乳酸浓度相似。
