Faculty of Health Sciences (Kinesiology), University of Ontario Institute of Technology, Oshawa, Ontario, Canada.
Faculty of Human Kinetics, University of Windsor, Windsor, Ontario, Canada.
Appl Ergon. 2019 Nov;81:102896. doi: 10.1016/j.apergo.2019.102896. Epub 2019 Jul 16.
Accurate estimations of manual arm strength (MAS) are crucial in the evaluation of occupational force demands relative to population capacity. Most current strength predictions assume force application with a vertically oriented handle, but it is unknown how uni-manual force capability changes as a function of handle orientation and hand location. This study evaluated the effect of handle orientation on MAS throughout the reach envelope. Fifteen female participants exerted maximum forces in six directions (i.e. superior, inferior, anterior, posterior, medial, lateral), at five different hand locations, and MAS was measured with the handle oriented at 0° (i.e. horizontal), 45°, 90° (i.e. vertical) and 135°. Handle orientation affected MAS in all but the anterior exertion direction, with significant interactions between hand location and grip orientation existing for the superior and inferior directions. These results suggest that handle orientation is important to consider in future predictive models of manual arm strength.
准确估计手动臂力（MAS）对于评估与人群能力相关的职业力需求至关重要。大多数当前的强度预测假设力的施加是通过垂直方向的手柄进行的，但手柄方向和手的位置如何影响单手力量能力的变化尚不清楚。本研究评估了手柄方向在手臂伸展范围内对 MAS 的影响。十五名女性参与者在六个方向（即上方、下方、前方、后方、内侧、外侧）、五个不同的手位置上施加最大力，手柄方向分别为 0°（即水平）、45°、90°（即垂直）和 135°。除了前方的用力方向外，手柄方向对 MAS 有影响，在上方和下方用力方向，手的位置和握持方向之间存在显著的相互作用。这些结果表明，在未来的手动臂力预测模型中，手柄方向是需要考虑的重要因素。
