Interindividual variation of isolated muscle performance and fibre-type composition in the toad Bufo viridus

Wilson, R. S., James, R. S., Kohlsdorf, T. and Cox, V. M. (2004) Interindividual variation of isolated muscle performance and fibre-type composition in the toad Bufo viridus. Journal of Comparative Physiology B-biochemical Systemic And Environmental Physiology, 174 6: 453-459. doi:10.1007/s00360-004-0431-7


Author Wilson, R. S.
James, R. S.
Kohlsdorf, T.
Cox, V. M.
Title Interindividual variation of isolated muscle performance and fibre-type composition in the toad Bufo viridus
Journal name Journal of Comparative Physiology B-biochemical Systemic And Environmental Physiology   Check publisher's open access policy
ISSN 0174-1578
Publication date 2004-01-01
Sub-type Article (original research)
DOI 10.1007/s00360-004-0431-7
Volume 174
Issue 6
Start page 453
End page 459
Total pages 7
Editor G. Heldmaier
Place of publication Germany
Publisher Springer-Verlag
Collection year 2004
Language eng
Subject C1
270604 Comparative Physiology
780105 Biological sciences
Abstract Interindividual analyses of physiological performance represent one of the most powerful tools for identifying functional positive and negative linkages between various performance traits. In this study we investigated functional linkages in the whole-gastrocnemius performance of juvenile Bufo viridis by examining interindividual variation in in vitro muscle performance and muscle fibre-type composition. We used the work-loop technique to investigate the maximum in vitro power output and fatigue resistance of the gastrocnemius muscle during repeated sets of three cycles at the cycle frequency of 5 Hz, simulating an intermittent style of locomotion. We found several significant correlations between different measures of in vitro muscle performance, including a negative correlation between maximum net power output and fatigue resistance of power, indicating functional trade-offs between these performance traits. We also investigated the extent of individual variation in the proportions of different fibre types, and tested for correlations between individual variation in muscle fibre-type composition and the previously measured isolated muscle performance. Fast glycolytic fibres represented 84.0+/-3.4% of the muscle, while the combined slow oxidative and fast oxidative-glycolytic fibres represented 16+/-3.4%. We found no significant correlations between measures of in vitro muscle performance and the proportion of different fibre types in the gastrocnemius muscle. However, despite this lack of correlation between whole-muscle performance and muscle fibre-type composition data, we suggest the functional linkages detected between different measures of in vitro muscular performance have important ecological and evolutionary consequences.
Keyword Physiology
Zoology
Toad
Performance
Muscle
Power Output
Fatigue Resistance
Laboratory House Mice
Myosin Heavy-chain
Locomotor Performance
Contractile Properties
Quantitative Genetics
Skeletal-muscle
Trade-offs
Activity Metabolism
Anuran Amphibians
Mammalian Muscle
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 13:08:52 EST