Document Detail

The influence of load knowledge on lifting technique.
MedLine Citation:
PMID:  8287855     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to analyse the influence of load knowledge on lifting technique. Ten men lifted a box containing either no weight or weights of 150, 250 or 300 N with and without knowledge of what was inside the box. The kinetics and kinematics of the lift were analysed using a force plate, an optoelectronic motion analysis system, and a rigid body link model. At 0 N lifting, the unknown load resulted in a jerk-like motion and a significantly increased peak L5-S1 flexion-extension moment. At 150 N there was also a significant increase in the speed of trunk extension with unknown weights, but the L5-S1 moment remained unchanged. At higher load levels there were only minor differences between lifting techniques when knowing and not knowing the load. We conclude that lifts are approached assuming a certain weight, and that when the assumption is wrong and the load lighter than anticipated lifting is performed with a 'jerking' motion, creating unnecessary loads on the lower back.
D Butler; G B Andersson; J Trafimow; O D Schipplein; T P Andriacchi
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Ergonomics     Volume:  36     ISSN:  0014-0139     ISO Abbreviation:  Ergonomics     Publication Date:  1993 Dec 
Date Detail:
Created Date:  1994-02-24     Completed Date:  1994-02-24     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0373220     Medline TA:  Ergonomics     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1489-93     Citation Subset:  IM; S    
Department of Orthopedic Surgery, Rush-Presbyterian-St Luke's Medical Center, Chicago, IL 60612.
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MeSH Terms
Hip Joint / physiology
Knee Joint / physiology
Movement / physiology*
Weight-Bearing / physiology*
Grant Support

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