Waddell Morgan L, Amazeen Eric L
Department of Psychology, Arizona State University, Tempe, AZ, USA.
Q J Exp Psychol (Hove). 2018 Oct;71(10):2174-2185. doi: 10.1177/1747021817739784. Epub 2018 Jan 1.
Research has shown that perceived heaviness is a function of the ratio of muscle activity (measured by electromyogram [EMG]) to the resulting acceleration of the object. However, objects will commonly be lifted at different speeds, implying variation in both EMG and acceleration. This study examined the effects of lifting speed by having participants report perceived heaviness for objects lifted by elbow flexion at three different speeds: slow, preferred, and fast. EMG and angular acceleration were recorded during these lifts. Both EMG and angular acceleration changed across lift speed. Nevertheless, despite these variations, perceived heaviness consistently scaled to the ratio of EMG to angular acceleration. The exponents on these parameters suggested that the saliency of muscle activity and movement changed across the three lift speeds.
研究表明，感知到的重量是肌肉活动（通过肌电图[EMG]测量）与物体产生的加速度之比的函数。然而，物体通常会以不同的速度被举起，这意味着肌电图和加速度都会发生变化。本研究通过让参与者报告以三种不同速度（慢、偏好速度和快）通过屈肘举起物体时的感知重量，来检验举起速度的影响。在这些举起过程中记录了肌电图和角加速度。肌电图和角加速度都随着举起速度而变化。尽管如此，尽管存在这些变化，但感知到的重量始终与肌电图与角加速度的比值成比例。这些参数的指数表明，肌肉活动和运动的显著性在三种举起速度下有所变化。
