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首页> 外文期刊>International Journal of Industrial Ergonomics >Shoulder muscle activity in off-axis pushing and pulling tasks
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Shoulder muscle activity in off-axis pushing and pulling tasks

机译：肩部肌肉活动在轴上推动和拉动任务

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Workspace design can often dictate the muscular efforts required to perform work, impacting injury risk. Within many environments, industrial workers often use sub-maximal forces in offset directions in to accomplish job tasks. The purpose of this research was to develop methods to estimate shoulder muscle activation during seated, static, sub-maximal exertions in off-axis (non-cardinal) directions. Surface EMG signals were recorded from 14 upper extremity muscles in 20 right-handed university aged, right-handed males (age: 22 +/- 3 years, weight: 77.5 +/- 11.1 kg, height 179.0 +/- 7.0 cm) participated in this study. Each participant performed 60 submaximal exertions (40N) directed at 4 off-axis phase angles of 45 degrees (45 degrees, 135 degrees, 225 degrees, and 315 degrees) in 3 planes (frontal, sagittal, and transverse) in 5 hand locations within a right handed reach envelope. The influence of hand location and force direction on muscle activity was evaluated with a forced-entry stepwise regression model. The ability of previously published on-axis prediction equations to predict muscle activity during these off-axis exertions was also evaluated. Within each muscle, activity levels were affected by both hand location and three-dimensional force direction and activation levels ranged from <1 to 37 %MVE. For each force direction there were 75 predictive equations selected and used, and the specific equation that best predicted activation depended on the muscle, exertion direction and hand location evaluated. This work assists ergonomic workplace design to minimize muscle demands during commonly performed off-axis exertions. These estimated demands can be employed to improve workplace design to reduce workplace injuries and enhance worker productivity.
机译：工作区设计通常可以决定执行工作所需的肌肉努力，影响伤害风险。在许多环境中，工业工人经常使用偏移方向的子最大力来完成工作任务。本研究的目的是开发借助轴的静力，亚最大施加期间估计肩部肌肉激活的方法。表面EMG信号从20次右手大学的14个上肢肌肉记录，右手男性（年龄：22 +/- 3岁，重量：77.5 +/- 11.1公斤，身高179.0 +/- 7.0 cm）参加在这个研究中。每个参与者在3个平面（正面，矢状和横向）内，在4个轴上的轴颈角度（45度，135度，225度和315度）中进行了60个轴颈剥离（40n）右手到达信封。用强制进入逐步回归模型评价手位置和力方向对肌肉活性的影响。还评估了先前公布的轴上预测方程以预测这些轴轴锻炼期间的肌肉活动的能力。在每块肌内，活性水平受手位位置的影响，并且三维力方向和活化水平范围为<1至37％MVE。对于每个力方向，选择和使用75个预测方程，以及最佳预测激活的特定方程依赖于评估的肌肉，施加方向和手势。这项工作有助于符合人体工程学的工作场所设计，以最大限度地减少常轴耗尽过程中的肌肉需求。这些估计的需求可以采用来改善工作场所设计，以减少工作场所伤害，提高工人生产力。

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