在最大推拉力作用下手柄稳定性的生物力学分析。
Biomechanical analysis for handle stability during maximum push and pull exertions.
机构信息
Department of Industrial Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA.
出版信息
Ergonomics. 2009 Dec;52(12):1568-75. doi: 10.1080/00140130903287999.
This study investigated the effect of handle stability on maximum push/pull force. It was hypothesised that people apply force in directions deviated from the pure push/pull direction to generate a moment that assists producing greater push/pull force when the handle position is fixed (stable) compared to when it is not fixed (unstable). Eight healthy subjects performed maximum push and pull exertions on a stable and an unstable handle in a seated posture, while maximum push/pull force, vertical force and lateral force were recorded. For the unstable handle, vertical and lateral forces were not different from zero during push and pull. For the stable handle, subjects intuitively applied significant downward force during push and significant upward force during pull exertions. As predicted from biomechanical analysis, this downward and upward force was found to be significantly associated with increased push and pull force, respectively, for the stable handle compared to the unstable handle.
本研究旨在探讨手柄稳定性对最大推/拉力的影响。研究假设，当手柄位置固定（稳定）时，人们会施加偏离纯推/拉方向的力，产生一个力矩，以帮助产生更大的推/拉力，而当手柄位置不固定（不稳定）时则不会产生这个力矩。八名健康受试者采用坐姿分别在稳定和不稳定手柄上进行最大推和拉动作，同时记录最大推/拉力、垂直力和侧向力。对于不稳定手柄，在推和拉过程中，垂直力和侧向力均为零。对于稳定手柄，受试者在推和拉动作中会本能地施加明显的向下力和向上力。正如生物力学分析所预测的那样，与不稳定手柄相比，这种向下和向上的力与稳定手柄的推和拉力的增加分别呈显著相关。
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