In vivo mechanical response of human Achilles tendon to a single bout of hopping exercise

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Title In vivo mechanical response of human Achilles tendon to a single bout of hopping exercise
Author Peltonen, Jussi; Cronin, Neil; Avela, Janne; Finni, Taija
Journal Name Journal of Experimental Biology
Year Published 2010
Place of publication United Kingdom
Publisher The Company of Biologists Ltd
Abstract 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.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1242/jeb.033514
Copyright Statement Self-archiving of the author-manuscript version is not yet supported by this journal. Please refer to the journal link for access to the definitive, published version or contact the author for more information.
Volume 213
Issue Number 8
Page from 1259
Page to 1265
ISSN 0022-0949
Date Accessioned 2010-10-27
Date Available 2011-03-08T06:50:16Z
Language en_AU
Faculty Griffith Health Faculty
Subject Biomechanics
URI http://hdl.handle.net/10072/36058
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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