Document Detail

Isokinetic performance capacity of trunk muscles. Part II: Coefficient of variation in isokinetic measurement in maximal effort and in submaximal effort.
MedLine Citation:
PMID:  9122648     Owner:  NLM     Status:  MEDLINE    
It has been claimed that with the aid of isokinetic trunk strength measuring devices it is possible to distinguish true muscular weakness from submaximal effort in the test. This proposition is based on the presumption that in the isokinetic trunk strength test identical performances can only be reproduced by maximal effort. The purpose of this study was to investigate whether it is possible to distinguish maximal effort from submaximal with the aid of the coefficient of variation (CV) in an isokinetic trunk muscle strength test. The study group included 35 (21 male and 14 female) subjects of whom 12 were healthy, 10 had a mild low-back pain and 13 had a more severe chronic low-back pain. The subjects performed five consecutive bendings both with maximal (100%) and submaximal (50%) efforts at a speed of 90 degrees/second. In maximal effort only healthy subjects reached an average level of CV close to 10% both in extension and in flexion. In the chronic low-back pain group the average CV was close to 20%. The difference in CV was statistically significant (p < 0.05-0.02) between the healthy and the chronic low-back pain subjects. In the submaximal effort all health groups had a CV of approximately 20% or more and no significant differences were found. The group of slightly variable measurements (CV = 11-20%) was remarkably large in both the maximal and submaximal effort. The results suggest that an effort with a CV of 11-20% cannot be classified as definitely submaximal or maximal. When the CV is less than 10% the effort can be fairly certainly classified as maximal.
S Luoto; M Hupli; H Alaranta; H Hurri
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Scandinavian journal of rehabilitation medicine     Volume:  28     ISSN:  0036-5505     ISO Abbreviation:  Scand J Rehabil Med     Publication Date:  1996 Dec 
Date Detail:
Created Date:  1997-04-24     Completed Date:  1997-04-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0212503     Medline TA:  Scand J Rehabil Med     Country:  SWEDEN    
Other Details:
Languages:  eng     Pagination:  207-10     Citation Subset:  IM    
ORTON Rehabilitation Centre Invalid Foundation, Helsinki, Finland.
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MeSH Terms
Back / physiopathology*
Low Back Pain / physiopathology*
Muscle, Skeletal / physiopathology*

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