Musculoskeletal Stress in Repetitive Precision Tasks

描述(申请人提供)：有证据表明，精密工作是 与上肢肌肉骨骼疾病有关， 尤其是肩膀。一系列符合逻辑的析因实验将显示 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 工业工作的影响。然而，理解更可控的因素，如 随着任务布局或组织因素的精确交互，将提供 指出哪些符合人体工程学的干预措施将最好地减轻 精确度。 该研究还将提供运动时间和运动时间的同步信息 肌肉骨骼压力。将使用肌肉骨骼应力的几个指数 包括：肌肉激活模式、不适感等级、姿势测量、 以及计算与任务无关的姿势变化的次数。索引： 移动时间将根据由拟合数据找到的系数来确定 关于将运动转化为方程所需的时间；这打破了运动 移动特定距离所需的时间，以及所需的时间 接近精确的目标。这些信息将显示出 肌肉骨骼应力和运动时间是否相关，以及它们是否 共存的或者是一个在时间上领先于另一个的。有关以下各项的资料- 将运动时间与压力联系起来将为农学家提供另一种工具来 评估躯体疲劳或压力。 重复的测量实验将持续一到两个小时，并将提供 关于精确度的有害影响是否随着 任务持续时间，以及这些影响对于不同的 精确度和任务布局相结合。在早期的实验中，这将是 给出工作何时应该停止、何时应该开始的预测值。在后者中 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.