Document Detail

The difference in stiffness of the active plantarflexors between young and elderly human females.
MedLine Citation:
PMID:  8473695     Owner:  NLM     Status:  MEDLINE    
The purpose of this investigation was to determine the difference in the intrinsic stiffness of the active plantarflexor muscles between young and elderly human females, and to determine changes in this stiffness associated with a 6-week strengthening exercise program. Intrinsic muscle stiffness was determined by measuring the resistance in the first 62 milliseconds offered by the muscle to multiple single stretch trials at 20% to 60% of maximal isometric contraction. Stiffnesses were related to pre-stretch torque (K/PST) by a linear fit. The K/PST relationship of the elderly subjects exhibited a steeper slope, indicating a greater increase in stiffness with an increase in pre-stretch torque. The effect of testing subjects at identical relative, but different absolute pre-stretch torque levels precluded definitive conclusions on possible stiffness differences between the age groups. After the strengthening exercise program, the plantarflexors showed an increase in maximum produced torque, and a decrease in stiffness as well as a decrease in the slope of the K/PST relationship.
P Blanpied; G L Smidt
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of gerontology     Volume:  48     ISSN:  0022-1422     ISO Abbreviation:  J Gerontol     Publication Date:  1993 Mar 
Date Detail:
Created Date:  1993-05-17     Completed Date:  1993-05-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0374762     Medline TA:  J Gerontol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  M58-63     Citation Subset:  AIM; IM    
Program in Physical Therapy, University of Rhode Island, Kingston.
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MeSH Terms
Aging / physiology*
Ankle Joint / physiology*
Exercise / physiology
Foot / physiology*
Isometric Contraction / physiology
Middle Aged
Muscle Contraction / physiology*
Muscle Relaxation / physiology
Muscles / physiology*
Physical Education and Training
Range of Motion, Articular / physiology
Stress, Mechanical

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

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