Influence of dynamic factors and external loads on the moment at the lumbar spine in lifting.
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.
Buseck
M
M
Department of Orthopedics, Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois.
Schipplein
O D
OD
Andersson
G B
GB
Andriacchi
T P
TP
D000328:Adult; D006801:Humans; D008159:Lumbar Vertebrae / Q000502:physiology*; D008297:Male; D005082:Physical Exertion; D013314:Stress, Mechanical; D014891:Weight Lifting