Trunk muscle coactivation in preparation for sudden load
Trunk muscle coactivation in preparation for sudden load
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DOI：
10.1016/s1050-6411(01)00003-7
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发表时间：
2001-08-01
影响因子：
2.5
通讯作者：
Sanford, AH
中科院分区：
文献类型：
--
作者：
Granata, KP;Orishimo, KF;Sanford, AH
腰椎的生物力学稳定性是腰椎疾患的病因和控制的重要因素。生物力学稳定性的一个主要组成部分是由预备肌肉共激活产生的肌肉骨骼僵硬。这项研究的目的是量化准备行为，在静态伸展任务中评估躯干突然屈曲负荷之前的躯干肌肉活动，并与被试被告知不会发生突然负荷时观察到的活动进行比较。协同作用的激发也被作为疲劳和性别的函数进行了检验。结果显示，在静态疲劳运动后，伸肌和屈肌的协同激活增加，潜在地补偿了躯干僵硬的减少。女性受试者比男性受试者产生更大的屈肌对抗。当受试者期待突然的屈曲负荷时，与被试被告知不会施加突然负荷时，在类似的静态姿势下观察到的招募模式相比，准备共动肌招募模式没有观察到差异。这表明在动态负荷条件下，神经肌肉系统在很大程度上依赖于反应特性来维持稳定性。(C)2001爱思唯尔科学有限公司。保留所有权利。
Biomechanical stability of the lumbar spine is an important factor in the etiology and control of low-back disorders. A principle component of biomechanical stability is the musculoskeletal stiffening generated by preparatory muscle coactivation. The goal of this investigation was to quantify preparatory behavior, evaluating trunk muscle activity immediately prior to sudden trunk flexion loading during static extension tasks compared to activity observed when subjects were informed no sudden load would occur. Coactive excitation was also examined as a function of fatigue and gender. Results demonstrated increased extensor muscle and flexor muscle coactivation following static fatiguing exertions, potentially compensating for reduced trunk stiffness. Female subjects produced greater flexor antagonism than in the males. No difference in the preparatory coactive muscle recruitment patterns were observed when subjects were expecting a sudden flexion load compared to recruitment patterns observed in similar static postures when subjects were informed no sudden load would be applied. This indicates the neuromuscular system relies greatly on response characteristics for the maintenance of stability in dynamic loading conditions. (C) 2001 Elsevier Science Ltd. All rights reserved.