NDLI: 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.

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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.

Content Provider	Semantic Scholar
Author	Navas, Carlos Arturo
Copyright Year	2007
Abstract	Mating success of individual male frogs within explosive breeding species can depend on their ability to compete for a mate and to hold onto that mate during amplexus. Such importance of amplexus has resulted in the evolution of sexual dimorphism in the morphology and contractile characteristics of the anuran forelimb muscles used during amplexus. The aims of our study were to use an explosive breeding frog (Rana temporaria) during the breeding season to compare extensor carpi radialis (ECR) muscle length, mass, isometric activation times, relaxation times, absolute force, relative force (stress) and fatigue between male and female frogs. We found that ECR muscle mass and length were greater (tenfold and 1.4-fold, respectively), absolute tetanic muscle force and relative tetanic force (stress) were greater (16-fold and 2.2-fold, respectively) and relaxation times were slower in males than in females. Male ECR muscles incompletely relaxed during fatigue tests and showed less fatigue than female muscles. These sex differences are likely to be beneficial to the male frogs in allowing them to produce relatively high absolute muscle forces for prolonged periods of time to hold onto their mate during amplexus.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://jeb.biologists.org/content/jexbio/210/4/715.full.pdf
PubMed reference number	17267656v1
Volume Number	210
Part	4
Journal	The Journal of experimental biology
Language	English
Access Restriction	Open
Subject Keyword	Anura Breeding Fatigue Flexor carpi radialis Muscle Physiological Sexual Disorders Rana esculenta Rana temporaria Relaxation Sex Characteristics Upper Extremity
Content Type	Text
Resource Type	Article

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