Document Detail

Effect of attempted lifting speed on forces and torque exerted on the lumbar spine.
MedLine Citation:
PMID:  4033399     Owner:  NLM     Status:  MEDLINE    
Factors affecting compressive and shear forces and torque at the L5/S1 vertebral joint were examined for nine different load/lifting-speed combinations during performances of a dynamic lifting task by 10 subjects. Loads were 40, 60, and 80% of each subject's maximum lifting capability. Target lifting times were 1.5, 3.5, and 7 s. A rigid link model of the human body was used to derive estimates of axial force, shear force, and torque acting at the L5/S1 vertebral joint from high-speed film data. Variables examined empirically were myoelectric activity at the fifth lumbar level of sacrospinalis and intra-abdominal pressure. The respective effects of load and attempted lifting time were assessed through two-factor ANOVA's and subsequent Scheffé tests. Heavier loads were found to result in significantly higher (P less than .001) values of mean compressive force, mean shear force, and maximum myoelectric activity. Faster target lifting times resulted in significantly higher mean and maximum values of all the variables quantified except intra-abdominal pressure.
S J Hall
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  17     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1985 Aug 
Date Detail:
Created Date:  1985-10-24     Completed Date:  1985-10-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  440-4     Citation Subset:  IM; S    
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MeSH Terms
Lumbar Vertebrae / physiology*
Models, Biological
Stress, Mechanical

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

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