Document Detail

Body weight-normalized knee extension strength explains sit-to-stand independence: a validation study.
MedLine Citation:
PMID:  19050646     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to validate the ability of body weight-normalized knee extension strength to explain sit-to-stand (STS) independence in home care patients. Isometric knee extension force of 31 seated patients (mean age 72.8 years) was measured with a handheld dynamometer. The combined force of both knees was then normalized against body weight. The patients' ability to stand from a chair without using their upper limbs was observed. Independence in the task was correlated significantly (rpb = 0.711, p < 0.001) with strength. Regression analysis revealed a positive odds ratio for strength as a predictor of STS independence (1.197, 1.055-1.357). Receiver operating characteristic analysis showed an area under the curve of 93.7%. The normalized strength cutoff point of 46.3% provided the best sensitivity (85.7%) and specificity (88.2%). This study supports previous research showing a strong relationship between normalized knee extension strength and STS independence. The cutoff points of this and previous studies can serve as goals for muscle strengthening for individuals unable to stand from a chair without use of their upper limbs.
Richard W Bohannon
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Publication Detail:
Type:  Journal Article; Validation Studies    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  23     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2009-01-06     Completed Date:  2009-05-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  309-11     Citation Subset:  IM    
Department of Physical Therapy, Neag School of Education, University of Connecticut, Storrs, Connecticut, USA.
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MeSH Terms
Age Factors
Aged, 80 and over
Body Weight / physiology*
Knee Joint / physiology*
Logistic Models
Muscle Contraction / physiology
Muscle Strength / physiology*
Muscle Strength Dynamometer
Muscle, Skeletal / physiology
Posture / physiology*
ROC Curve
Range of Motion, Articular / physiology*
Reference Values
Sensitivity and Specificity

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

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