Musculoskeletal Stress in Repetitive Precision Tasks

描述（由申请人提供）：有证据表明，精密工作是 与上肢的肌肉骨骼疾病相关， 尤其是肩膀。一系列合乎逻辑的析因实验将表明 精确度是单独作用还是与其他任务因素交互作用， 肌肉骨骼压力可能无法修改精度要求 工业工作。然而，了解更多的可控因素，如 由于任务布局或组织因素与精确度相互作用， 关于哪些人体工程学干预措施最能减轻 精度 这项研究还将提供有关运动时间的同步信息， 肌肉骨骼压力将使用几个肌肉骨骼应力指数 包括：肌肉激活模式，不适等级，姿势测量， 以及非任务相关姿势移位的数量的计数。指标 运动时间将根据从拟合数据中找到的系数来确定 在等式中移动所需的时间上，这会打断移动 移动特定距离所需的时间，以及移动特定距离所需的时间。 以接近精确目标这些信息将显示， 肌肉骨骼应力和运动时间是相关的，以及它们是否 在时间上是否一个先于另一个。关于- 运动时间与压力的联系将为农学家提供另一种工具， 评估躯体疲劳或压力。 重复测量实验将持续一到两个小时， 关于精度的有害影响是否随着 任务持续时间，以及这些影响是否因 精度和任务布局的组合。在早期的实验中， 给出工作何时应该停止和何时应该开始的预测。后期 实验，信息国家将提供一种手段来评估 工作/休息周期的有效性。

DESCRIPTION (provided by applicant): There is evidence that precision work is associated with musculoskeletal disorders of the upper extremities, particularly the shoulders. A logical series of factorial experiments will show whether precision acts alone or interactively with other task factors to elicit musculoskeletal stress. It may not be possible to modify the precision demands of industrial work. However, understanding how more controllable factors, such as task layout or organizational factors interact with precision, will provide pointers as to which ergonomic interventions would best mitigate the impact of precision. The study will also provide simultaneous information about movement time and musculoskeletal stress. Several indices of musculoskeletal stress will be used including; muscle activation patterns, discomfort ratings, postural measures, and counts of the number of non-task related postural shifts. Indices of movement time will be determined from the coefficients found from fitting data on the time it takes to make movements to an equation; that breaks movement time into the time required to move particular distances, and the time required to close in on precision targets. Such information will show whether musculoskeletal stress and movement time are correlated, and whether they coexist or whether one precedes the other in time. Information about the - association of movement time with stress would give agronomists another tool to assess somatic fatigue or stress. The repeated measures experiments will last one to two hours and will provide information about whether the deleterious effects of precision accumulate with task duration, and whether those effects are different for different combinations of precision and task layout. In the early experiments, this would give predictors for when work should stop and when should begin. In the later experiments, that info-nation would provide a means to evaluate the effectiveness of work/ rest cycles.