Butler Heather L, Hubley-Kozey Cheryl L, Kozey John W
Department of Industrial Engineering, Dalhousie University, Halifax, NS, Canada.
Eur J Appl Physiol. 2009 May;106(1):95-104. doi: 10.1007/s00421-009-0994-9. Epub 2009 Feb 11.
It is assumed when lifting with the dominant hand that the relationship between contralateral and ipsilateral trunk muscle responses are similar to when lifting with the non-dominant hand. The purpose of this study was to quantify trunk muscle activation amplitude patterns during right- and left-handed lifts. Surface electromyography (EMG) and kinematic variables were recorded from 29 healthy subjects. Minimal trunk and pelvis motion was observed. Three principal patterns accounted for 95% of the variation in the EMG data indicating minimal variation in the pattern. Significant differences in scores captured different recruitment strategies for reach and hand. Selective and differential recruitment of back sites characterized lifts at greater distances from the body, whereas co-activation between internal oblique and back sites characterized lifts closer to the body. While the results showed no handedness effect for back muscles, the external oblique responded differently between right- and left-handed lifts. Specific recruitment strategies were used to account for subtle changes in reach and asymmetrical demands.
假设在用优势手进行提举时，对侧和同侧躯干肌肉反应之间的关系与用非优势手进行提举时相似。本研究的目的是量化右利手和左利手提举过程中躯干肌肉激活幅度模式。从29名健康受试者身上记录了表面肌电图（EMG）和运动学变量。观察到躯干和骨盆的运动极小。三种主要模式占肌电图数据变化的95%，表明模式变化极小。分数上的显著差异反映了不同的伸手和手部募集策略。在离身体较远的提举动作中，背部不同部位的选择性和差异性募集是其特征，而在离身体较近的提举动作中，腹内斜肌和背部部位之间的共同激活是其特征。虽然结果显示背部肌肉不存在利手效应，但在右利手和左利手提举过程中，腹外斜肌的反应有所不同。采用特定的募集策略来解释伸手动作的细微变化和不对称需求。
