Haque Serajul, Khan Abid Ali
Department of Mechanical Engineering, Z H College of Engineering & Technology, Aligarh Muslim University, Aligarh-202002, UP, India.
J Hum Ergol (Tokyo). 2009 Jun;38(1):1-9.
Work-related musculoskeletal disorders (WMSDs) is related with the frequency of exertion for repetitive tasks requiring heavy load. Different researchers have reported that a poor posture is very much responsible for WMSD if combined with increased load and/or frequency. In the assembly tasks in different industries involve the gripping very commonly. Therefore in the present study it was tried to find the effect of a wrist posture on grip strength. For design of experiment, subjects, flexion/extension and ulnar deviation of the wrist were taken as independent variables and the dependent variable was maximum voluntary contraction (MVC) of grip. The results showed that the effect of flexion/extension angle, ulnar angle and the subject on MVC grip were highly significant (i.e., p<0.001, 0.001 and 0.002 respectively). The two-way interaction effect of flexion/extension angle of the wrist and the subject on MVC grip was also found significant at p<0.001. The other interaction effects were not found significant. MVC grip was found maximum at the neutral wrist posture.
与工作相关的肌肉骨骼疾病（WMSDs）与需要重负荷的重复性任务的用力频率有关。不同的研究人员报告说，如果姿势不良再加上负荷增加和/或频率增加，那么WMSD的发生很大程度上与此有关。在不同行业的装配任务中，抓握动作非常常见。因此，在本研究中，试图找出手腕姿势对握力的影响。在实验设计中，将受试者、手腕的屈伸和尺偏作为自变量，因变量是握力的最大自主收缩（MVC）。结果表明，屈伸角度、尺偏角度和受试者对握力MVC的影响非常显著（即p分别<0.001、0.001和0.002）。手腕屈伸角度与受试者对握力MVC的双向交互作用在p<0.001时也显著。未发现其他交互作用显著。在手腕中立姿势时，握力MVC最大。
