Energy cost and muscular activity required for propulsion during walking
Energy cost and muscular activity required for propulsion during walking
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DOI：
10.1152/japplphysiol.00670.2002
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发表时间：
2003-05-01
影响因子：
3.3
通讯作者：
Kram, R
中科院分区：
文献类型：
--
作者：
Gottschall, JS;Kram, R
我们认为，在最佳辅助水平力的情况下，代谢率的降低将反映正常行走时产生推进力的成本。此外，踝关节伸肌电图（EMG）活动的减少可能表明推进性肌肉活动。在受试者以1.25 m/s的速度行走时，我们在腰部施加水平力，从15%体重的辅助力到15%体重的阻碍力。当水平力为体重的10%时，1)步行的净代谢成本降低到正常步行的53%，2)在推进阶段，腓肠肌内侧（MG）的平均肌电图降低到正常步行的59%，然而3)比目鱼肌（Sol）的平均肌电图没有显著降低。我们的数据表明，产生水平推进力几乎占正常行走代谢成本的一半。此外，MG似乎在向前推进中起着重要作用，而Sol则没有。
We reasoned that with an optimal aiding horizontal force, the reduction in metabolic rate would reflect the cost of generating propulsive forces during normal walking. Furthermore, the reductions in ankle extensor electromyographic (EMG) activity would indicate the propulsive muscle actions. We applied horizontal forces at the waist, ranging from 15% body weight aiding to 15% body weight impeding, while subjects walked at 1.25 m/s. With an aiding horizontal force of 10% body weight, 1) the net metabolic cost of walking decreased to a minimum of 53% of normal walking, 2) the mean EMG of the medial gastrocnemius (MG) during the propulsive phase decreased to 59% of the normal walking magnitude, and yet 3) the mean EMG of the soleus ( Sol) did not decrease significantly. Our data indicate that generating horizontal propulsive forces constitutes nearly half of the metabolic cost of normal walking. Additionally, it appears that the MG plays an important role in forward propulsion, whereas the Sol does not.