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A randomized controlled trial of chair interventions on back and hip pain among sewing machine operators: the los
Pin-Chieh Wang1, Beate R Ritz, Ira Janowitz
1Department of Epidemiology, School of Public Health, University of California, Los Angeles, California, USA.
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.