Strategies of muscular support of varus and valgus isometric loads at the human knee
Strategies of muscular support of varus and valgus isometric loads at the human knee
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DOI：
10.1016/s0021-9290(01)00095-1
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发表时间：
2001-10-01
影响因子：
2.4
通讯作者：
Buchanan, TS
中科院分区：
文献类型：
--
作者：
Lloyd, DG;Buchanan, TS
在本文中，我们研究了受试者如何激活他们的肌肉在静态膝关节内翻和外翻负荷。肌肉对外部力矩的贡献使用膝的EMG驱动的生物力学模型来估计。检查个体肌肉激活和负荷模式，以确定神经系统用于支持膝内翻和外翻力矩的策略。结果发现：（1）股四头肌和腘绳肌的共同收缩。（2）股薄肌和阔筋膜张肌的激活随内翻和外翻力矩的增加而增加。这2种激活模式为膝关节的外翻和内翻载荷提供了积极支持。缝匠肌似乎被激活，为膝关节的外翻载荷提供了积极支持。而在内翻力矩期间，该肌肉增加了膝关节上的内翻负荷，即提供负支撑。一般来说，腘绳肌和股四头肌的共同收缩有助于内翻和外翻力矩的大部分肌肉支撑。此外，在纯内翻和纯外翻时，共收缩分别支持11-14%的外部力矩。似乎有特定目的的激活策略来支持内翻和外翻力矩，尽管很小，这表明在内翻和外翻力矩的支持过程中神经运动系统的双重目标。(C)2001爱思唯尔科技有限公司版权所有。
In this paper we studied how subjects activate their muscles in response to static varus and valgus loads at the knee. The muscles' contributions to the external moments were estimated using an EMG driven biomechanical model of the knee. The individual muscle activation and loading patterns were examined to identify the strategies that the nervous system uses to support varus and valgus knee moments. It was found that the (1) co-contraction of the hamstrings and quadriceps. and (2) activation of the gracilis and tensor fascia lata increased with the increasing magnitude of the varus and valgus moments. These 2 activation patterns provided positive support of valgus and varus loads at the knee The sartorius appears to be activated to provide positive support of valgus loads at the knee. whereas during varus moments this muscle increases the varus load on the knee, i.e. provides negative support. Generally, the hamstrings and quadriceps co-contraction contributed to most of the muscular support of the varus and valgus moments. In addition, co-contraction supported 11-14% of the external moment in pure varus and pure valgus respectively. It appears that there are activation strategies with the specific purpose to support varus and valgus moments, albeit small, which suggest dual goals of the neuromotor system during the support of varus and valgus moments. (C) 2001 Elsevier Science Ltd. All rights reserved.