Document Detail

Effects of transient muscle contractions and stretching on the tendon structures in vivo.
MedLine Citation:
PMID:  12028136     Owner:  NLM     Status:  MEDLINE    
This study compared the effects of static stretching (ST) and repeated muscle contractions (CON) on the viscoelastic properties of tendon structures in vivo. Eight male subjects performed ST (passively flexed to 35 of dorsiflexion) for 5 min and 50 repetitions of isometric maximum voluntary contraction (MVC) for 3 s each with 3 s relaxation. Before and after each task, the elongation of the tendon and aponeurosis of the medial gastrocnemius muscle (MG) was directly measured by ultrasonography, while the subjects performed ramp isometric plantar flexion up to MVC, followed by a ramp relaxation. The relationship between the estimated muscle force (Fm) and tendon elongation (L) during the ascending phase was applied to a linear regression, the slope of which was defined as stiffness of the tendon structures. The percentage of the area within the Fm-L loop to the area beneath the curve during the ascending phase was calculated as an index representing hysteresis. The ST protocol significantly decreased the stiffness (-8%) and hysteresis (29%)., respectively. In contrast, the CON protocol significantly decreased the stiffness, but not the hysteresis. These results suggested that the stretching and repeated contractions would make the tendon structures more complaint, and further decreased the hysteresis of the tendon structures.
K Kubo; H Kanehisa; T Fukunaga
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  175     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  2002 Jun 
Date Detail:
Created Date:  2002-05-24     Completed Date:  2002-09-16     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  England    
Other Details:
Languages:  eng     Pagination:  157-64     Citation Subset:  IM    
Department of Life Science (Sports Sciences), University of Tokyo, Meguro, Japan.
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MeSH Terms
Exercise / physiology*
Isometric Contraction / physiology
Muscle Contraction / physiology*
Tendons / anatomy & histology*,  physiology*
Time Factors

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