Department of Industrial Engineering, Universidad San Francisco de Quito, Quito, Ecuador.
Institute of Occupational and Social Medicine and Health Services Research, University of Tübingen, Tubingen, Germany.
Ergonomics. 2020 Feb;63(2):163-174. doi: 10.1080/00140139.2019.1677949. Epub 2019 Oct 16.
The potential of rotating postures to alleviate the effects of prolonged standing and sitting postures has been advocated to attenuate the accumulation of muscle fatigue, considered a precursor to musculoskeletal disorders. We aimed to evaluate the effects of two posture rotations, both including standing, walking, sitting, on physiological and neuromotor measures. Twenty-two participants followed two posture rotations, with different rest-break distributions, for 5.25 h. Lower-leg muscle twitch force, volume, force control and discomfort perception were evaluated during and after work exposure on two non-consecutive days. Significant changes in all measures indicate a detrimental effect in lower-leg long-lasting muscle fatigue, oedema, performance and discomfort after 5 h for both exposures. However, for both exposures recovery was significant 1 h and 15 h post-workday. Differences between the two rotation schedules were not significant. Hence, stand-walk-sit posture rotation promotes recovery of the tested measures and is likely to better prevent muscle fatigue accumulation. Lower-leg muscle twitch force, volume, force control, and discomfort were quantified during and after 5 h of stand-walk-sit work rotations with two different rest-break distributions. Measures revealed similar significant effects of work exposures regardless of rotation; which did not persist post-work. This beneficial recovery contrasts with the standing only situations. MSDs: musculoskeletal disorders; MTF: muscle twitch force; RMSE: root mean square error; MVC: maximum voluntary contraction; : mean; SE: standard error.
旋转姿势缓解长时间站立和坐姿影响的潜力，被认为可以减轻肌肉疲劳的积累，而肌肉疲劳是肌肉骨骼疾病的前兆。我们旨在评估两种姿势旋转（均包括站立、行走和坐姿）对生理和神经运动测量的影响。22 名参与者按照两种不同的休息-间断分布进行了两种姿势旋转，持续 5.25 小时。在工作暴露期间和之后的两天内，评估小腿肌肉抽搐力、体积、力量控制和不适感知。所有测量值的显著变化表明，在两种暴露情况下，5 小时后小腿长时间肌肉疲劳、水肿、性能和不适都会产生不利影响。然而，两种暴露后 1 小时和 15 小时恢复显著。两种旋转时间表之间的差异不显著。因此，站立-行走-坐姿姿势旋转可促进所测试措施的恢复，并且可能更好地防止肌肉疲劳的积累。在两种不同的休息-间断分布下，对 5 小时的站立-行走-坐姿工作旋转过程中和之后，对小腿肌肉抽搐力、体积、力量控制和不适进行了量化。无论旋转如何，措施都显示出相似的工作暴露的显著影响；而这些影响在工作后不会持续存在。这种有益的恢复与仅站立的情况形成对比。MSD：肌肉骨骼疾病；MTF：肌肉抽搐力；RMSE：均方根误差；MVC：最大随意收缩；：平均值；SE：标准误差。
