Dickerson C R, Martin B J, Chaffin D B
Faculty of Applied Health Sciences, University of Waterloo, Canada.
Ergonomics. 2007 Jul;50(7):1004-16. doi: 10.1080/00140130701295947.
The mechanism of muscular effort perception in the shoulder was examined in this experiment. Two shoulder biomechanical models and experimental muscle activity data were used to assess physical exposure for a series of reaching tasks. Effort perception was quantitatively correlated to these measures of physical loading, both at the resultant torque (r(2) = 0.50) and muscle activity model-based muscle force predictions (MFPs): r(2) = 0.42, electromyography (EMG): r(2) = 0.26) levels. Muscle data did not explain variation in effort perception more fully than torque data. The inclusion of subject and task variables improved the ability of each model to explain variability in effort perception (torque: r(2) = 0.74; MFP: r(2) = 0.67, EMG: r(2) = 0.64). These results suggest that effort perception may not be fully explained by only an image of the motor command, but is rather a complex integrative quantity that is affected by other factors, such as posture and task goals, which may be dependent on sensory feedback.
本实验研究了肩部肌肉用力感知的机制。使用两个肩部生物力学模型和实验性肌肉活动数据来评估一系列伸手任务中的身体暴露情况。用力感知与这些身体负荷测量指标在合力矩（r² = 0.50）以及基于肌肉活动模型的肌肉力量预测（MFPs）：r² = 0.42、肌电图（EMG）：r² = 0.26）水平上均存在定量相关性。肌肉数据并未比扭矩数据更充分地解释用力感知的变化。纳入受试者和任务变量提高了每个模型解释用力感知变异性的能力（扭矩：r² = 0.74；MFP：r² = 0.67，EMG：r² = 0.64）。这些结果表明，用力感知可能无法仅通过运动指令的图像来完全解释，而是一个复杂的综合量，会受到其他因素的影响，如姿势和任务目标，而这些因素可能依赖于感觉反馈。
