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J Occup Environ Med. 2008 Mar;50(3):255-62. doi: 10.1097/JOM.0b013e318163869a.

A randomized controlled trial of chair interventions on back and hip pain among sewing machine operators: the los angeles garment study.

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1
Department of Epidemiology, School of Public Health, University of California, Los Angeles, California, USA.

Abstract

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.

PMID:
18332775
DOI:
10.1097/JOM.0b013e318163869a
[Indexed for MEDLINE]
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