Jin Sangeun, Mirka Gary A
The Human and Safety Engineering Laboratory, Department of Industrial Engineering, Pusan National University, Busan, 46241, Republic of Korea.
The Ergonomics Laboratory, Department of Industrial and Manufacturing Systems Engineering, Iowa State University, Ames, IA 50011-2164, USA.
Appl Ergon. 2017 Sep;63:72-78. doi: 10.1016/j.apergo.2017.04.002. Epub 2017 Apr 14.
Previous literature has documented the alterations in the flexion-relaxation response of the lumbar extensor musculature to passive tissue elongation (PTE) and muscle fatigue (MF). There is no study, however, that has explored this response as a function of the combined effect of both PTE and MF, which is often seen in occupational settings. Twelve participants performed three experimental protocols on three different days to achieve (1) PTE, (2) MF and (3) PTE&MF (combined). Trunk kinematics and muscle activities were monitored to assess the effects of these protocols on the peak lumbar flexion angle and the lumbar angle of the flexion-relaxation of the trunk extensor muscles. Results showed responses to the uni-dimensional stresses (PTE and MF) consistent with those seen in the previous literature, while the combined protocol elicited responses that more closely matched the PTE protocol.
以往文献已记录了腰椎伸肌对被动组织伸展（PTE）和肌肉疲劳（MF）的屈伸放松反应变化。然而，尚无研究探讨这种反应作为PTE和MF联合作用的函数，而这种联合作用在职业环境中很常见。12名参与者在三天内进行了三个实验方案，以实现（1）PTE、（2）MF和（3）PTE&MF（联合）。监测躯干运动学和肌肉活动，以评估这些方案对腰椎最大前屈角度和躯干伸肌屈伸放松腰椎角度的影响。结果显示，对一维应力（PTE和MF）的反应与以往文献中的一致，而联合方案引发的反应与PTE方案更接近。
