Document Detail

In vivo mechanical response of human Achilles tendon to a single bout of hopping exercise.
MedLine Citation:
PMID:  20348337     Owner:  NLM     Status:  MEDLINE    
Stiffness of the human Achilles tendon (AT) was determined in vivo before and after a single bout of hopping exercise. It was hypothesized, based on published data using in vitro specimens, that a reduction in AT stiffness may occur after just 1000 loading cycles at physiological stress levels. Ten healthy subjects performed two-legged hopping exercise consisting of 1150-2600 high impacts. Tendon stiffness was determined in several isometric ramp contractions [20%, 40%, 60%, 80% and 100% maximum voluntary contraction (MVC)] during which tendon elongation was measured using ultrasonography and two cameras. Tendon force was calculated by dividing measured ankle torque by magnetic resonance imaging-derived AT lever arm length. Tendon stiffness remained unchanged, being 430+/-200 N mm(-1) before and 390+/-190 N mm(-1) after the exercise [not significant (n.s.)]. Despite the lack of changes in stiffness, maximum tendon force during MVC was reduced from 3.5+/-0.6 kN to 2.8+/-0.7 kN (P<0.01). As the proposed decline in stiffness was not observed, it is concluded that mechanical fatigue did not take place in the AT of healthy individuals after a single bout of high-impact exercise performed until exhaustion.
Jussi Peltonen; Neil J Cronin; Janne Avela; Taija Finni
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  213     ISSN:  1477-9145     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-03-29     Completed Date:  2010-07-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1259-65     Citation Subset:  IM    
Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, Finland.
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MeSH Terms
Achilles Tendon* / anatomy & histology,  physiology
Exercise / physiology*
Movement / physiology*
Muscle Contraction / physiology
Muscle, Skeletal / physiology
Stress, Mechanical
Young Adult

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