EFFECTS OF WORK AND REST ON UPPER EXTREMITY SIGNS AND SYMPTOMS OF WORKERS PERFORMING REPETITIVE TASKS

The temporal relationship between work and signs and symptoms of upper extremity musculoskeletal disorders among workers at risk is relative ly unexplored. The study focused on changes in upper extremity circumf erence, volume, sensory threshold, and reported symptoms after work an d rest All workers (N = 50) performed a repetitive poultry processing task and had exhibited upper extremity signs and symptoms in baseline testing prior to this study These workers manifested significantly inc reased upper extremity circumference following a period of rest, with circumferences decreasing during work. Upper extremity volume and repo rted swelling also decreased during work. Reports of tenderness were s ignificantly greater after work than after rest while reports of pain were greatest after a short rest interval. Results show that the signs and symptoms observed in these workers were manifestations of occupat ional cumulative trauma and that further study of the relationship bet ween work and signs and symptoms is needed.