A randomized controlled trial of chair interventions on back and hip pain among sewing machine operators: the Los Angeles garment study.
Rempel-DM; Wang-PC; Janowitz-I; Harrison-RJ; Yu-F; Ritz-BR
J Occup Environ Med 2008 Mar; 50(3):255-262
OBJECTIVE: Determine whether an adjustable chair with a curved or a flat seat pan improved monthly back and hip pain scores in sewing machine operators. METHODS: This 4-month intervention study randomized 293 sewing machine operators with back and hip pain. The participants in the control group received a placebo intervention, and participants in the intervention groups received the placebo intervention and one of the two intervention chairs. RESULTS: Compared with the control group, mean pain improvement for the flat chair intervention was 0.43 points (95% CI = 0.34, 0.51) per month, and mean pain improvement for the curved chair intervention was 0.25 points (95% CI = 0.16, 0.34) per month. CONCLUSIONS: A height-adjustable task chair with a swivel function can reduce back and hip pain in sewing machine operators. The findings may be relevant to workers who perform visual- and hand-intensive manufacturing jobs.
Ergonomics; Musculoskeletal-system-disorders; Mathematical-models; Statistical-analysis; Questionnaires; Factory-workers; Assembly-line-workers; Machine-shop-workers; Machine-operation; Equipment-operators; Back-injuries; Posture
David Rempel, MD, University of California, San Francisco, Department of Medicine, 1301 S 46th Street, Building 163, Richmond, CA 94804
Journal of Occupational and Environmental Medicine
University of California - Los Angeles