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First published online January 31, 2007
Journal of Experimental Biology 210, 715-721 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.000646

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Sexual dimorphism of extensor carpi radialis muscle size, isometric force, relaxation rate and stamina during the breeding season of the frog Rana temporaria Linnaeus 1758

Carlos A. Navas^1,* and Rob S. James²

¹ Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão–Travessa 14 No 321, CEP 05508-900, São Paulo, SP, Brasil
² Department of Biomolecular and Sport Sciences, Faculty of Health and Life Sciences, Coventry University, CV1 5FB, UK

View larger version (6K): [in this window] [in a new window]   Fig. 1. Changes in peak tetanic force production during fatigue testing of Rana temporaria extensor carpi radialis muscle. Values are mean ± s.d. (N=5 for males, N=7 for females). Males, closed symbols; females, open symbols.

View larger version (8K): [in this window] [in a new window]   Fig. 2. Typical raw force traces plotted against time for a male (solid line) and a female (broken line) extensor carpi radialis muscle from Rana temporaria during fatigue testing.