Effectiveness of a lumbar support continuous passive motion device in the prevention of low back pain during prolonged sitting.
METHODS
Subjective ratings of discomfort were compared between a fixed lumbar support and lumbar support continuous passive motion (CPM) device.


OBJECTIVE
To compare a fixed lumbar support with a lumbar support CPM device during prolonged sitting.


BACKGROUND
To prevent low back pain during prolonged sitting, an inflatable lumbar support CPM has been developed. There are no studies that compare static lumbar support with lumbar CPM using the same pressure in the cushions.


METHODS
A total of 31 male volunteers without low back pain sat in the same chair for a 2-hour period on each of 3 consecutive days under 3 randomized test methods: 1, no lumbar support; 2, static lumbar support; and 3, lumbar support CPM. Each subject rated low back pain, stiffness, fatigue, and buttock numbness on a visual analog scale (VAS). Fixed lumbar support and CPM device were compared with a same inflation pressure in the cushion. For 10 subjects, the whole body posture and the pressure distribution changes of the human-seat interface during CPM were evaluated.


RESULTS
Compared with no lumbar support, a significant improvement in VAS scores for low back pain, stiffness, and fatigue was obtained with both static lumbar support and with lumbar support CPM (P < 0.005). A significant (P < 0.005) improvement for buttock numbness was obtained only with lumbar support CPM. There were no statistical differences in all VAS scores between the fixed lumbar support and the CPM device. A forward rotation of the pelvic region was obtained during inflation of the cushion during CPM. Significant differences (P < 0.05) were found between cushion inflation and deflation periods both in contact areas and in the peak pressures at the human-seat interface.


CONCLUSIONS
There were no statistical differences in the subjective ratings of discomfort between the fixed lumbar support and the CPM device.
Aota
Yoichi
Y
Department of Orthopaedic Surgery, Yokohama City University, School of Medicine, Yokohama, Japan. yaota@fukuhp.yokohama-cu.ac.jp
Iizuka
Haruhiko
H
Ishige
Yusuke
Y
Mochida
Takashi
T
Yoshihisa
Takeshi
T
Uesugi
Masaaki
M
Saito
Tomoyuki
T
D000328:Adult; D004867:Equipment Design; D006801:Humans; D006987:Hypesthesia / Q000209:etiology / Q000517:prevention & control; D007374:Interior Design and Furnishings; D017116:Low Back Pain / Q000209:etiology / Q000517:prevention & control*; D008297:Male; D015915:Motion Therapy, Continuous Passive / Q000295:instrumentation / Q000379:methods / Q000523:psychology; D018763:Muscle Fatigue; D010388:Pelvis; D011187:Posture; D011312:Pressure; D012399:Rotation