Cook C S, McDonagh M J
School of Sport and Exercise Sciences, University of Birmingham, United Kingdom.
J Appl Physiol (1985). 1996 Jul;81(1):384-92. doi: 10.1152/jappl.1996.81.1.384.
Force-velocity curves in human muscle often have unexpectedly high forces at high velocities. If series elasticity is the cause, it should have less effect at lower activation levels and larger shortening amplitudes. The first dorsal interosseus muscle-tendon complex was shortened at different levels of activation and by different amplitudes. Force-velocity curves had high force well maintained at high velocities. With an actuator release of 4.21 mm at 80% of maximal activation, force was > 45% of isometric force (Po) for all actuator velocities > 200 mm/s (1.49 muscle lengths/s). At 30% activation, the force was > 25% of Po at these velocities. The smaller 2.46-mm releases produced higher forces than the 4.21-mm releases at these velocities. At 80% activation, force was > 65% of Po, and at 30% activation, it was > 50% of Po at these velocities. Corrections of these data for elasticity produced classic Hill-type force-velocity curves. A model incorporating the Hill force-velocity equation and a spring in series accounts for the results.
人体肌肉的力-速度曲线在高速度时常常具有出乎意料的高力值。如果串联弹性是其原因，那么在较低激活水平和较大缩短幅度下，它的影响应该较小。第一背侧骨间肌-肌腱复合体在不同激活水平和不同幅度下进行缩短。力-速度曲线在高速度时能很好地保持高力值。在最大激活的80%时，致动器释放4.21毫米，对于所有大于200毫米/秒（1.49肌肉长度/秒）的致动器速度，力大于等长力（Po）的45%。在30%激活时，在这些速度下力大于Po的25%。在这些速度下，2.46毫米的较小释放量产生的力比4.21毫米的释放量更高。在80%激活时，在这些速度下力大于Po的65%，在30%激活时，力大于Po的50%。对这些数据进行弹性校正后得到了经典的希尔型力-速度曲线。一个结合了希尔力-速度方程和串联弹簧的模型解释了这些结果。
