The influence of increasing steady-state walking speed on muscle activity in below-knee amputees
The influence of increasing steady-state walking speed on muscle activity in below-knee amputees
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DOI：
10.1016/j.jelekin.2009.02.004
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发表时间：
2010-02-01
影响因子：
2.5
通讯作者：
Neptune, R. R.
中科院分区：
文献类型：
--
作者：
Fey, N. P.;Silverman, A. K.;Neptune, R. R.
这项研究的目的是确定膝下截肢者在稳态步行速度增加时肌肉活动的变化。对14名截肢者和10名非截肢者的双侧肌电(EMG)数据进行了研究，分别采集了8条完整小腿和5条残肢肌肉在4种地面步行速度下的肌电数据。使用综合肌电测量方法，我们对仙人掌肌肉的三个假说进行了检验：(1)残肢和完整腿之间的肌肉活动没有差异；(2)完整腿和非截肢腿之间的肌肉活动没有差异；(3)残肢和完整腿的肌肉活动随着速度的增加而增加。大多数截肢者的肌电模式在腿之间是相似的，并且随着速度的增加而增加。残存小腿股二头肌长头的差异有统计学意义。股外侧肌和股直肌，在制动过程中，与完整的腿相比，其幅度增加。这些适应与在没有足底屈肌的情况下需要额外的身体支撑和向前推进是一致的。除了完整的小腿臀中肌外，所有完整的小腿肌肉与对照小腿的肌电模式相似，最后，残存的、完整的和对照小腿的肌电都有显著的速度效应，并且随着速度的增加，除了臀中肌之外，其余的小腿肌肉都有显著的速度效应。(C)2009爱思唯尔有限公司保留所有权利。
The goal of this study was to identify changes in muscle activity in below-knee amputees in response to increasing steady-state walking speeds. Bilateral electromyographic (EMG) data were collected from 14 amputee and 10 non-amputee subjects during four overground walking speeds from eight intact leg and five residual leg Muscles. Using integrated EMG measures, we tested three hypotheses for cacti muscle(1) there would be no difference in muscle activity between the residual and intact legs, (2) there would be no difference in muscle activity between the intact leg and non-amputee legs, and (3) muscle activity in the residual and intact legs would increase with speed Most amputee EMG patterns were similar between legs and increased in magnitude with speed. Differences occurred in the residual leg biceps femoris long head. vastus lateralis and rectus femoris, which increased in magnitude during braking compared to the intact leg. These adaptations were consistent with the need for additional body support and forward propulsion in the absence of the plantar flexors. With the exception of the intact leg gluteus medius, all intact leg muscles exhibited similar EMG patterns compared to the control leg Finally, the residual, intact and control leg EMG all had a significant speed effect that increased with speed with the exception of the gluteus medius. (C) 2009 Elsevier Ltd All rights reserved.