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Atsuki Fukutani and Toshiyuki Kurihara

Recent studies have reported that resistance training increases the cross-sectional areas (CSAs) of tendons; however, this finding has not been consistently observed across different studies. If tendon CSA increases through resistance training, resistance-trained individuals should have larger tendon CSAs as compared with untrained individuals. Therefore, in the current study, we aimed to investigate whether resistance training increases tendon CSAs by comparing resistance-trained and untrained individuals. Sixteen males, who were either body builders or rugby players, were recruited as the training group, and 11 males, who did not participate in regular resistance training, were recruited into the control group. Tendon CSAs and muscle volumes of the triceps brachii, quadriceps femoris, and triceps surae were calculated from images obtained by using magnetic resonance imaging. The volumes of the 3 muscles were significantly higher in the training group than in the control group (P < .001 for all muscles). However, a significant difference in tendon CSAs was found only for the distal portion of the triceps surae tendon (P = .041). These findings indicate that tendon CSA is not associated with muscle volume, suggesting that resistance training does not increase tendon CSA.

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Tijs Delabastita, Stijn Bogaerts and Benedicte Vanwanseele

. , & Arampatzis , A. ( 2014 ). Human Achilles tendon plasticity in response to cyclic strain: Effect of rate and duration . The Journal of Experimental Biology, 217 ( Pt. 22 ), 4010 – 4017 . PubMed ID: 25267851 doi:10.1242/jeb.112268 Carroll , C.C. , Dickinson , J.M. , Haus , J.M. , Lee , G