[Study on effect of backrest thickness to lumbar muscle fatigue during computer work].
OBJECTIVE
To investigate the relationship between backrest thickness and lumbar muscle fatigue so as to confirm the fitting backrest thickness.


METHODS
Twenty subjects coming from university seated at a computer workstation in three backrest thicknesses: 4, 7 and 10 cm. The time that the subjects reported the lumbar muscle fatigue was collected during each trial and subjective appraise was collected at the end of the entire protocol.


RESULTS
The MF value decreased and lumbar muscle felt fatigue in all three backrest thickness. Subject could feel fatigue more late [(45.0 +/- 10.8) min] and subject felt more comfort at 7 cm thickness.


CONCLUSIONS
It is better to relive computer worker lumbar muscle fatigue when the backrest thickness was kept on 7 cm. Work break was needed because one hour work could cause muscle fatigue.
Peking University Health Science Center, Beijing 100191, China.
Yan-di
YD
Huang
Sheng
S
Wang
Tong
T
Wang
Li-hua
LH
He
Yuan-feng
YF
Liu
D000328:Adult; D005260:Female; D006801:Humans; D008161:Lumbosacral Region; D008297:Male; D018763:Muscle Fatigue; D018482:Muscle, Skeletal / Q000502:physiology; D016272:Occupational Health; D011187:Posture; D013180:Sprains and Strains / Q000209:etiology / Q000517:prevention & control*; D055815:Young Adult