OCCUPATIONAL APPLICATIONSMotion analysis of three workers at a large hospital kitchen was conducted using video recordings as part of this case study. Workers were observed during both a high-demand period and a low-demand period to evaluate their exposure to physical risk factors for work-related musculoskeletal disorders. On average, workers' reaching posture did not change significantly with customer demand. However, recovery time decreased by 18% and hand activity level (HAL) increased by 27% when customer demand increased. On an individual basis, the only worker whose work pace was constrained by processing (cooking) time and the availability of materials to complete the tasks had the most recovery time and did not show an increase in HAL even with an increase in demand. These results suggest the importance of designing tasks that are paced externally (e.g., cooking time) in a self-paced operation to limit the reduction in recovery time and increase in HAL as demand increases.
Keywords: Hand activity level; customer demand; field observation; reaching posture; recovery time; work pace.