Document Detail

Trunk kinematics of one-handed lifting, and the effects of asymmetry and load weight.
MedLine Citation:
PMID:  8851536     Owner:  NLM     Status:  MEDLINE    
This study investigated trunk kinematic differences between lifts performed using either one hand (unsupported) or two hands. These effects were studied while beginning the lifts from different asymmetric starting positions and while lifting different load weights. Each subject lifted a box from a lower to an upper platform under one- and two-handed lifting conditions. Subjects wore a lumbar spine electrogoniometer, from which relative motion components were calculated in the trunk's three cardinal planes. Results of this study showed that one-handed lifting resulted in significantly higher ranges of motion in the lateral and transverse planes and greater flexion in the sagittal plane. Back motion characteristics previously found to be associated with low back disorders were all significantly higher for one-handed lifts. The two-handed lift technique, on the other hand, produced overall faster trunk motions in the sagittal plane and equal or larger acceleration and deceleration magnitudes in all planes of motion. Increases in load asymmetry affected trunk kinematics, in that magnitude values for range of motion, velocity and acceleration became much greater with increasingly asymmetric load positions. Increasing the load weight appeared to have less of an effect on trunk kinematics, with increases in position mostly occurring during sagittal and lateral bending. These results suggest that unsupported one-handed lifting loads the spine more than two-handed lifts, due to the added coupling. Applying these results to a previously developed model, one-handed lifting was also found to increase one's risk of suffering a low back disorder.
W G Allread; W S Marras; M Parnianpour
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ergonomics     Volume:  39     ISSN:  0014-0139     ISO Abbreviation:  Ergonomics     Publication Date:  1996 Feb 
Date Detail:
Created Date:  1996-12-17     Completed Date:  1996-12-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0373220     Medline TA:  Ergonomics     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  322-34     Citation Subset:  IM; S    
Biodynamics Laboratory, Ohio State University, Columbus 43210, USA.
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MeSH Terms
Functional Laterality / physiology*
Human Engineering
Lumbar Vertebrae / physiology*
Muscle, Skeletal / physiology*
Posture / physiology
Weight Lifting / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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