Earle-Richardson Giulia, Jenkins Paul L, Freivalds Andris, Burdick Patrick, Park Shihyun, Lee Cheol, Mason Christine, May John J
Northeast Center for Agricultural and Occupational Health, Cooperstown, New York, NY 13326, USA.
Am J Ind Med. 2006 Jan;49(1):23-9. doi: 10.1002/ajim.20239.
Migrant and seasonal orchard harvest workers experience musculoskeletal strain caused by carrying heavy loads and holding awkward postures. An ergonomic hip belt designed to redistribute weight from the upper back, neck, and shoulders to the hips was evaluated.
A comparison of muscle exertion (using electromyography [EMG]) of four key back and shoulder muscles and shoulder surface pressure (using a surface pressure sensor [PS]) was made among 10 laboratory volunteers under intervention and control conditions, in two postures (standing erect [0 degrees ]) and flexed [45 degrees ]).
All but one measure showed a significant reduction in the flexed posture with the intervention. Two of eight measures showed a significant reduction in the erect posture. Correlations with shoulder discomfort were found for deep shoulder EMG (r=0.71, P=0.021) and shoulder surface pressure (r=0.58, P=0.082).
The hip belt intervention produces significant reductions in muscle activity while in a posture commonly assumed during orchard work.
移民及季节性果园采摘工人因搬运重物和保持别扭姿势而遭受肌肉骨骼劳损。对一种旨在将重量从上背部、颈部和肩部重新分配到臀部的人体工程学髋带来进行了评估。
在干预和对照条件下，让10名实验室志愿者以两种姿势（直立[0度]和弯曲[45度]）对四块关键背部和肩部肌肉的肌肉用力情况（使用肌电图[EMG]）以及肩部表面压力（使用表面压力传感器[PS]）进行比较。
除一项测量指标外，所有指标在弯曲姿势下经干预后均显著降低。八项测量指标中有两项在直立姿势下显著降低。发现肩部深层肌电图（r = 0.71，P = 0.021）和肩部表面压力（r = 0.58，P = 0.082）与肩部不适存在相关性。
髋带干预在果园工作中常见的姿势下能显著降低肌肉活动。
