Pearson S J, Cobbold M, Harridge S D R
Department of Physiology, Royal Free & University College Medical School, Rowland Hill Street, London, NW3 2PF, UK.
Eur J Appl Physiol. 2004 Jun;92(1-2):176-81. doi: 10.1007/s00421-004-1046-0. Epub 2004 Mar 26.
The power-inertial load relationship of the lower limb muscles was studied during a single leg thrust using the Modified Nottingham Power Rig (mNPR) and during cycling exercise in nine young male subjects. The relationship between peak power and inertial load showed a parabolic-like relationship for mNPR exertions, with a peak [937 (SD 246) W] at 0.158 kg m(2), this being significantly (P <0.05) different from the power generated at both the lowest [723 (162) W] and highest [756 (206) W] inertial loads. In contrast, for cycling exercise power output did not differ significantly between inertial loads, except at the lowest inertia where power output was significantly ( P<0.05) less compared with all other inertial loads. Maximum peak power output during cycling was 1,620 (336) W, which was significantly (P <0.05) greater than that recorded on the mNPR. However, a close association was observed between the mean power generated by each method (r=0.84, P<0.05). The results suggest that during a single contraction a range of inertial loads is required to allow peak power to be expressed. Above a certain critical value, this is unnecessary during cycling movements where the load can be repeatedly accelerated.
利用改良的诺丁汉功率测试装置（mNPR），在9名年轻男性受试者进行单腿蹬伸以及骑自行车运动期间，研究了下肢肌肉的功率-惯性负荷关系。对于mNPR运动，峰值功率与惯性负荷之间呈抛物线状关系，在0.158 kg·m²时达到峰值[937（标准差246）W]，这与最低[723（162）W]和最高[756（206）W]惯性负荷时产生的功率有显著差异（P<0.05）。相比之下，对于骑自行车运动，除了在最低惯性负荷时功率输出显著（P<0.05）低于所有其他惯性负荷外，不同惯性负荷下的功率输出没有显著差异。骑自行车时的最大峰值功率输出为1620（336）W，显著（P<0.05）高于在mNPR上记录的值。然而，观察到两种方法产生的平均功率之间存在密切关联（r=0.84，P<0.05）。结果表明，在单次收缩过程中，需要一系列惯性负荷才能表现出峰值功率。在高于某个临界值时，在负荷可反复加速的骑自行车运动中则无需如此。
