Development of an effective method for physiological analysis of the elbow joint during movement assistance : a biomechanical perspective

本研究的目的是发展一种有效的方法，在运动辅助过程中手肘关节的生理分析。从生物力学的角度研究了接受援助者的身体负担变化以及肘关节角度与肌肉活动之间的关系。在第一个实验中，我们确定110度肘关节伸展和90度肘关节屈曲分别是肘关节伸展和屈曲中产生力量的最有效生物力学角度。在第二个实验中，这些结果被应用于临床试验的运动辅助模拟病人使用一组护士作为主题。将角度计连接到受试者手肘关节，并在运动辅助期间测量肘关节角度。肌电图被用来评估动作过程中的肱三头肌，肱二头肌，竖脊肌，和肱三头肌肌肉的动作电位，并确定肘角和这些肌肉的动作电位之间的关系。在第三个实验中，一组不是护士的健康志愿者女性与第二个实验一样对模拟患者进行运动辅助，并进行相同的测量。结果显示，护士能够通过在运动辅助过程中保持适当的肘部角度来减轻肱三头肌、肱二头肌、竖脊肌和肱二头肌的负担。然而，在非护士中没有观察到这种效果。

The purpose of this study was to develop an effective method for physiological analysis of the elbow joint during movement assistance. Changes in the physical burden placed on the person receiving assistance and the relationship between elbow joint angle and muscle activity were examined from the perspective of biomechanics. In the first experiment, we identified that 110 degrees of elbow joint extension and 90 degrees of elbow joint flexion were the most biomechanically efficient angles for strength production in elbow joint extension and flexion, respectively. In the second experiment, these results were applied clinically in a trial of movement assistance for a simulated patient using a group of nurses as subjects. An angle meter was attached to the elbow joint of the subjects and elbow angles were measured during movement assistance. Electromyography was used to assess the action potential of the triceps brachii, biceps brachii, erector spinae, and trapezius muscles during movement assistance, and the relationship between elbow angle and the action potential of these muscles was determined. In the third experiment, a group of healthy volunteer women who were not nurses provided performed movement assistance for a simulated patient as in the second experiment, and the same measurements were performed. The results demonstrated that nurses were able to reduce the burden on the triceps brachii, biceps brachii, erector spinae, and trapezius muscles by maintaining an appropriate elbow angle during movement assistance. However, this effect was not observed in non-nurses.