An electromyographic study of the plantar flexors of the ankle in normal walking on the level.
An electromyographic study of the plantar flexors of the ankle in normal walking on the level.
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正常水平行走时踝关节跖屈肌的肌电图研究。
DOI：
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发表时间：
1966
期刊：
影响因子：
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通讯作者：
David H. Sutherland
中科院分区：
文献类型：
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作者：
David H. Sutherland
本研究证实了踝跖屈肌在水平行走时的间接膝关节稳定功能。通过结合同步肌电图和步态的运动图像，踝跖屈肌的活动期和增加膝关节伸展和足背屈的活动期被证明是对应的。只有在踝关节跖屈肌活动期结束时，才发生足跖屈。膝关节伸展发生在股四头肌活动停止后，似乎不是由股四头肌活动产生的。提供了一种替代假设，而不是将站立阶段的膝关节伸展与支撑线前方的重心移动联系起来的理论。该假设是，在站立阶段期间，在水平上的普通行走中，膝关节伸展是由踝跖屈肌抵抗踝关节背屈的力引起的，该背屈是由外力（动力、重力和地板反作用力）的合力产生的。外力的合力大于内力，表现为脚的背屈增加，直到脚跟离开开始。小腿肌肉在脚趾离地中的功能已经被其他作者广泛讨论，因此，在本报告中没有强调。踝跖屈肌对胫骨在距骨上的前旋减速的抑制作用是其稳定作用的关键。
This study confirms the indirect knee-stabilizing function of the ankle plantar flexors in walking on the level. By combined simultaneous electromyograms and motion pictures of gait the periods of activity of the ankle plantar flexors and of increasinig knee extension and dorsiflexion of the foot were shown to correspond. Only at the end of the period of ankle plantar-flexor action did plantar flexion of the foot occur. Knee extension took place after the cessation of activity of the quadriceps muscle and did not appear to be produced by quadriceps action. An alternate hypothesis is offered instead of the theory that relates knee extension in the stance phase to movement of the center of gravity in front of the line of support. This hypothesis is that knee extension during the stance phase, in ordinary walking on the level, is brought about by the force of the ankle plantar flexors resisting the dorsiflexion of the ankle, this dorsiflexion being produced by the resultant of the extrinsic forces (kinetic forces, gravity, and the floor reaction). The resultant of the extrinsic forces is greater than the intrinsic force, as manifested by the increasing dorsiflexion of the foot which occurs up until heel-off begins. The function of the calf muscles in toe-off has been widely discussed by other authors and, therefore, is not emphasized in this report. The restraining function of the ankle Plantar flexors in decelerating forward rotation of the tibia on the talus is the key to their stabilizing action.