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ORIGINAL PAPER M.A. Ashley-Ross J.U. Barker

M.A. Ashley-Ross J.U. Barker
The effect of fiber-type heterogeneity on optimized work and power
output of hindlimb muscles of the salamander Ambystoma tigrinum
Accepted: 16 July 2002 / Published online: 24 August 2002
Springer-Verlag 2002
Abstract Most vertebrate muscles are composed of a
mixture of fiber types. However, studies of muscle me-
chanics have concentrated on homogeneous bundles of
fibers. Hindlimb muscles of the tiger salamander, Am-
bystoma tigrinum, present an excellent system to explore
the consequences of fiber heterogeneity. Isometric
twitches and work loops were obtained in vitro from two
muscles, the m. iliotibialis pars posterior (heterogeneous,
containing types I, IIa and IIb fibers) and the m. ilio-
fibularis (nearly homogeneous for type IIa fibers).
Maximal isometric twitch and tetanic stresses in m. il-
iotibialis posterior were significantly greater than in il-
iofibularis. Work loops were obtained over a range of
frequencies (0.53.0 Hz) and strains (26% muscle


Source: Ashley-Ross, Miriam A. - Department of Biology, Wake Forest University


Collections: Environmental Sciences and Ecology; Biology and Medicine