Trade-offs between speed and endurance in the frog Xenopus laevis: a multi-level approach

Wilson, Robbie S., James, Rob S. and Van Damme, Raoul (2002) Trade-offs between speed and endurance in the frog Xenopus laevis: a multi-level approach. Journal of Experimental Biology, 205 8: 1145-1152.

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Author Wilson, Robbie S.
James, Rob S.
Van Damme, Raoul
Title Trade-offs between speed and endurance in the frog Xenopus laevis: a multi-level approach
Journal name Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
Publication date 2002-04-01
Year available 2002
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 205
Issue 8
Start page 1145
End page 1152
Total pages 8
Place of publication Cambridge
Publisher Company of Biologists
Language eng
Subject 270503 Animal Anatomy and Histology
Abstract One of the most interesting trade-offs within the vertebrate locomotor system is that between speed and endurance capacity. However, few studies have demonstrated a conflict between whole-animal speed and endurance within a vertebrate species. We investigated the existence of trade-offs between speed and endurance capacity at both the whole-muscle and whole-animal levels in post-metamorphs of the frog Xenopus laevis. The burst-swimming performance of 55 frogs was assessed using a high-speed digital camera, and their endurance capacity was measured in a constant-velocity swimming flume. The work-loop technique was used to assess maximum power production of whole peroneus muscles at a cycle frequency of 6 Hz, while fatigue-resistance was determined by recording the decrease in force and net power production during a set of continuous cycles at 2 Hz. We found no significant correlations between measures of burst swimming performance and endurance capacity, suggesting that there is no trade-off between these two measures of whole-animal performance. In contrast, there was a significant negative correlation between peak instantaneous power output of the muscles at 6 Hz and the fatigue-resistance of force production at 2 Hz (other correlations between power and fatigue were negative but non-significant). Thus, our data support the suggestion that a physiological conflict between maximum power output and fatigue resistance exists at the level of vertebrate muscles. The apparent incongruence between whole-muscle and whole-animal performance warrants further detailed investigation and may be related to factors influencing both whole-muscle and whole-animal performance measures.
Keyword Biology
trade-off
constraint
locomotion
performance
muscle
power output
fatigue resistance
frog
Xenopus laevis
Aerobic Performance Variation
Mechanical Power Output
Fiber-type Composition
Laboratory House Mice
Rat Diaphragm Muscle
Locomotor Performance
Quantitative Genetics
Swimming Performance
Evolutionary Physiology
Contractile Properties
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Biological Sciences Publications
 
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Created: Thu, 20 Sep 2007, 02:47:22 EST