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首页> 外文期刊>Journal of Biomechanics >Torso loading via a harness method activates trunk muscles less than a hand loading method.
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Torso loading via a harness method activates trunk muscles less than a hand loading method.

机译：通过线束法进行躯干加载比手部加载方法能更少地激活躯干肌肉。

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摘要

There is a need for data comparing muscle activity under equivalent moments at the torso using different loading methods. In torso biomechanics, it is often necessary to apply moments to people and then measure or predict the muscle activity in response to the external load. Alternative methods exist to generate moments including applying forces by a chest harness and loads held in the hands. The limitation of previous research has been to use only one of the loading methods, generally harness loading, assuming it produces muscle activity equal to when loads are held in the hands. The objective of the this study was to test if equivalent moments at L3/L4 applied to subjects through two loading methods resulted in the same muscle activity. Subjects maintained a static posture while attempting a combination of flexion/extension, lateral bending, and torsion to counter the external loads applied via hand and harness loading methods. Hand and harness loading did not result in equal muscle activity as measured by electromyographic techniques. The left and right latissimus dorsi had increases in activity (16-25%) when loads were held with the hands instead of applied via the harness. Increased activity for hand loading was also found for the left and right rectus abdominis (13-17%) and left external oblique (24%). The left and right erector spinae and right external oblique exhibited the same activity for both loading methods. The current findings indicate that studies of torso loading using a shoulder harness to create torso moments may be lowering activity of some torso muscles.
机译：需要使用不同的加载方法来比较躯干在等效力矩下的肌肉活动的数据。在躯干生物力学中，经常需要对人施加力矩，然后测量或预测响应于外部负荷的肌肉活动。存在产生力矩的替代方法，包括通过胸带施加力和握在手中的负荷。以前的研究的局限性是仅使用一种加载方法，通常是利用线束加载，假设它产生的肌肉活动与握在手中的载荷相等。这项研究的目的是测试通过两种加载方法对受试者施加的L3 / L4等效力矩是否导致相同的肌肉活动。受试者在尝试弯曲/伸展，横向弯曲和扭转相结合时保持静态姿势，以抵消通过手和吊带加载方法施加的外部载荷。通过肌电图技术测得的手和背带负荷并未导致相等的肌肉活动。当用手握住负载而不是通过线束施加负荷时，左背阔肌和右背阔肌的活动性增加（16-25％）。还发现左腹和右腹直肌（13-17％）和左外斜肌（24％）手负荷活动增加。两种加载方法的左，右竖脊肌和右外斜肌均表现出相同的活动。目前的发现表明，使用肩带产生躯干力矩的躯干负荷研究可能会降低某些躯干肌肉的活动。

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