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Belt effects on lumbar sagittal angles
1Department of Industrial Management, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei, Taiwan. yhlee@im.ntust.edu.tw
Objective:
The study examined the belt effects on the change of lumbar sagittal angles.
Design:
The effects of pelvic and lumbar belts on lumbar sagittal angles were examined both radiographically and videographically in standing, erect sitting, and slump sitting.
Background:
The resulting changes of lumbar angles when wearing belts with different mechanical characteristics should be different.
Methods:
Eighteen healthy male subjects participated in this study. L1/L3, L3/L5, L5/S1 and L1/S1 were measured with the aid of lateral radiographs. The external joint angles were also measured via the motion analysis system.
Results:
Radiographic data revealed an interactive effect between working posture and the use of a belt (P<0.046) on the change of L1/S1. In standing, both belts increased L1/S1 by increasing almost all the lumbar vertebral angles. In erect sitting, wearing lumbar belt had no effect but the pelvic belt decreased L1/S1 mainly through a decrease in L1/L3. In sitting slump with trunk flexion of 15 degrees, both belts increased L1/S1 and restricting the movement of the pelvis.
Conclusions:
Belt effect to the change of lumbar sagittal angles in posture which involve knee flexing and/or trunk flexing seems not as the same as in standing posture.
Relevance:
This study related internal vertebral angles and externally measured trunk angles with lumbar and pelvic belt usage.