Danion F, Bonnard M, Pailhous J
Cognition & Mouvement, Université d'Aix-Marseille II, Faculté de Médecine, URA CNRS 1166, IBHOP, Marseille, France.
Neurosci Lett. 1995 Mar 10;187(3):185-8. doi: 10.1016/0304-3940(95)11372-4.
In human gait, alternating leg flexion/extension movements essentially require the production of extension muscle forces due to the large contribution of passive forces to leg flexion. In this experiment, we studied the adaptive capabilities of walking subjects constrained with elastic cords which further facilitated leg flexion and impeded leg extension. In order to walk, the subjects let the moments created by the elastic cords increase the ankle flexion during the whole cycle, which allowed them to reduce part of these moments. By contrast, at the knee level, they increased their extension muscle activity to compensate for the remaining constraint moments during the swing phase, which resulted in unchanged kinematics. Although neuromuscular locomotor synergy is often considered to control the lower limb as a unit, we showed here that different adaptive mechanisms can act at different joints of the same leg.
在人类步态中，由于被动力对腿部屈曲的贡献很大，交替的腿部屈伸运动本质上需要产生伸展肌肉力量。在本实验中，我们研究了用弹性绳约束行走受试者的适应能力，弹性绳进一步促进了腿部屈曲并阻碍了腿部伸展。为了行走，受试者让弹性绳产生的力矩在整个周期内增加踝关节屈曲，这使他们能够减少部分力矩。相比之下，在膝关节水平，他们增加了伸展肌肉的活动，以补偿摆动期剩余的约束力矩，这导致运动学不变。尽管神经肌肉运动协同通常被认为是将下肢作为一个整体来控制，但我们在此表明，不同的适应机制可以作用于同一条腿的不同关节。
