在矢状面的坐姿负重移动任务中，躯干和下肢的力学作用。
The mechanical role of the trunk and lower extremities in a seated weight-moving task in the sagittal plane.
作者信息
Son K, Miller J A, Schultz A B
机构信息
Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor 48109-2125.
出版信息
J Biomech Eng. 1988 May;110(2):97-103. doi: 10.1115/1.3108424.
A two-dimensional, sagittally-symmetric biomechanical model was developed to analyze the joint moments required to stabilize the trunk in a seated, dynamic, weight-moving task. Kinematic and reaction force data were measured while subjects moved a hand-held weight (0-4 kgf) at shoulder level to and fro at 1 Hz. These data were then used for model input and validation purposes. A second, simpler model was used to simulate how joint loads varied with weight held, trunk inclination, and movement frequency. The results for this seated task demonstrate a) significant trunk, hip, knee, and ankle joint moments (37, 13, 4, 13 percent of maximum strength values, respectively) were required, b) considerable intersubject differences in mean joint moments (more than 66 percent) were found, which primarily were due to subtle differences in body segment kinematics and lower extremities use, and c) the important role of the lower extremities in stabilizing the trunk in the seated posture.
开发了一个二维、矢状面对称的生物力学模型，以分析在坐姿动态移重任务中稳定躯干所需的关节力矩。在受试者以1Hz的频率在肩部水平来回移动手持重物（0-4千克力）时，测量运动学和反作用力数据。然后将这些数据用于模型输入和验证。使用了第二个更简单的模型来模拟关节负荷如何随手持重量、躯干倾斜度和运动频率而变化。该坐姿任务的结果表明：a）需要显著的躯干、髋、膝和踝关节力矩（分别为最大力量值的37%、13%、4%、13%）；b）发现平均关节力矩存在相当大的个体间差异（超过66%），这主要是由于身体节段运动学和下肢使用的细微差异；c）下肢在坐姿中稳定躯干方面的重要作用。
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