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Spine (Phila Pa 1976). 1988 Aug;13(8):918-21.

Influence of dynamic factors and external loads on the moment at the lumbar spine in lifting.

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Department of Orthopedics, Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois.


Flexion-extension moments occurring at the L5-S1 level of the spine were calculated when subjects lifted a box weighing from 50 to 250 N. Lifting was performed at normal and fast speed, and the lifts were performed using a freestyle and a leglifting technique. The peak moment increased linearly with increasing load. The moment/load relationship was significantly influenced by lifting speed, and a higher moment occurred at each load level when lifting fast. Lifting speed was reduced when the external load was increased, particularly when the load was 150 N and higher. Moments when lifting using the leglifting technique were lower than when lifting freestyle.

[Indexed for MEDLINE]

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