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Evaluating the contributions of muscle activity and joint kinematics to weight perception across multiple joints

机译:评估肌肉活动和关节运动学对多个关节重量感知的贡献

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摘要

Perceived heaviness is clearly a function of muscle activity: objects feel heavy, in part because they are lifted with more force than lighter feeling objects. Recent research showed that participants scale their perceptions to the ratio of muscle activity to lift acceleration during elbow lifts (Waddell et al. J Exp Psychol Hum Percept Perform 42:363-374, 2016). The current study sought psychophysiological functions relating perceived heaviness to EMG and peak lift acceleration across multiple lifts employing different muscles as prime movers. Participants lifted objects with three arm lifts-shoulder, elbow, and wrist-and reported perceived heaviness. In each lift, EMG was recorded from the anterior deltoid, biceps brachii, and forearm flexors, and peak angular acceleration was recorded about each joint. The resulting psychophysiological functions revealed the hypothesized ratio of muscle activity to peak lift acceleration in all lifts. Principal component regressions showed that the EMG of the forearm flexors and peak acceleration of the lifting joint were most relevant for perceived heaviness. The special role of forearm flexors in perceiving heaviness across different lifts was interpreted in terms of the invariant structure of the inertia tensor about the wrist.
机译:感知沉重显然是肌肉活动的功能:物体感觉沉重,部分原因是它们比较轻的感觉物体更加力量。最近的研究表明,参与者将他们对肌肉活动比例的看法缩放到肘部升降机期间提升加速度(Waddell等人.J expenceCol Hum Percept 42:363-374,2016)。目前的研究寻求有效的心理生理功能,将沉重的功能与肌电有关的浓度和峰值提升加速度,以占用不同肌肉作为主要移动器。参与者用三个手臂抬起,肘部和手腕抬起物体,并报告的感知沉重。在每个电梯中,从前倍式倾角,二头肌Brachii和前臂屈肌记录EMG,并记录每个接头的峰角加速度。由此产生的心理生理功能揭示了所有升降机中肌肉活动的假设比率与峰值提升加速度。主成分回归显示,前臂屈肌的EMG和升降接头的峰值加速度最为相关,对感知沉重。前臂屈肌在不同升降机上感知沉重的特殊作用是在惯性张量的不变结构方面解释了手腕的不变结构。

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