Altered activation pattern in synergistic ankle plantarflexor muscles in a reduced-gravity environment
Altered activation pattern in synergistic ankle plantarflexor muscles in a reduced-gravity environment
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DOI：
10.1016/j.gaitpost.2005.07.010
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发表时间：
2006-08-01
期刊：
影响因子：
2.4
通讯作者：
Akai, Masami
中科院分区：
文献类型：
--
作者：
Miyoshi, Tasuku;Nakazawa, Kimitaka;Akai, Masami
我们研究了相对激活的协同踝跖屈肌，比目鱼肌（SOL）和内侧腓肠肌（MG），而受试者在水中行走。10名健康志愿者在三种不同的负荷和四种不同的速度条件下在水中行走。水的深度是每个受试者的腋窝，这减少了他或她体重的约80%。用表面电极记录SOL和MG的肌电活动，用防水测力台测量地面反作用力（GRF）。分析了在站立阶段两块肌肉之间的肌电活动水平与负荷和步行速度的关系。结果表明，SOL肌电活动对负荷的依赖性大于对行走速度的依赖性，而MG肌电活动对速度的依赖性更强。这种协同踝跖屈肌的分离激活可能与这些肌肉在功能性运动任务中所需的不同角色有关。(C)2005 Elsevier B.V.保留所有权利。
We investigated relative activations in the synergistic ankle plantarflexor muscles, the soleus (SOL) and medial gastrocnemius (MG), while subjects were walking in water. Ten healthy volunteers walked in water under three different load- and four different speed-conditions. The depth of water was to the axilla of each subject, which reduced about 80% of his or her body weight. The EMG activities of the SOL and MG were recorded with surface electrodes, and ground reaction forces (GRF) were measured by using a water-resistant force platform. Relations of EMG activity levels between the two muscles during the stance phase were analysed with respect to the load and walking speed. The results revealed that the SOL EMG activity was more dependent on the load than the walking speed in water, while the MG EMG activity was more dependent on the speed. Such dissociated activation of the synergistic ankle plantarflexors might be relevant to the different roles required of these muscles in functional motor tasks. (C) 2005 Elsevier B.V. All rights reserved.