Institute of Sport Science, Christian-Albrechts-University of Kiel, Germany.
Institute for Movement Science, University of Hamburg, Germany.
Appl Ergon. 2019 Jan;74:172-176. doi: 10.1016/j.apergo.2018.08.022. Epub 2018 Sep 2.
The aim of this study is to investigate the neuromuscular response of shoulder muscles at different attachment heights of a carrying system during arm movement. It was hypothesized that (1) different height adjustments lead to changes in muscle activity and (2) the shoulder horizontal provides a benchmark for the optimal attachment height of the shoulder belts. The musculus deltoideus was significantly relieved after the elevation of the shoulder belt for subjects with an initial attachment height of 2 cm below the shoulder. The musculus trapezius was relieved with the elevation above the shoulder. At a height of more than 2 cm above the shoulder, no further muscle unloading was achieved. These findings prove that a height adjustment can provide a systematic unloading or deloading of the shoulder musculature. Despite the fact that the magnitude and direction of changes in muscle activity lead to rather individual responses, the intra-individual responses are consistent. Therefore, support systems should provide the range of individual requirements.
本研究旨在探讨在手臂运动过程中，不同的承载系统附着高度对肩部肌肉的神经肌肉反应。假设（1）不同的高度调整会导致肌肉活动的变化，（2）肩部水平提供了肩部安全带最佳附着高度的基准。对于初始附着高度低于肩部 2cm 的受试者，肩带抬高后三角肌明显得到缓解。肩带抬高超过肩部时，斜方肌也得到缓解。在肩部以上超过 2cm 的高度，无法进一步减轻肌肉负荷。这些发现证明，高度调整可以对肩部肌肉进行系统的减压。尽管肌肉活动变化的幅度和方向导致了相当个体的反应，但个体内的反应是一致的。因此，支撑系统应提供个体需求的范围。
