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First published online September 15, 2004
Journal of Experimental Biology 207, 3629-3637 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01199

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The effects of sustained exercise and hypoxia upon oxygen tensions in the red muscle of rainbow trout

D. J. McKenzie^1,*, S. Wong², D. J. Randall³, S. Egginton⁴, E. W. Taylor¹ and A. P. Farrell²

¹ School of Biosciences, University of Birmingham, Birmingham B15 2TT, UK
² Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada
³ Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
⁴ Department of Physiology, University of Birmingham, Birmingham B15 2TT, UK

View larger version (34K): [in a new window]   Fig. 1. (A) Representative trace of red muscle PO2 (PRMO2) in a rainbow trout as measured every 1 min during approximately 42 h recovery from implantation of the micro-optode probe under anaesthesia. (B) Expanded view of the dotted box in A, with arrows indicating where the fish was observed to struggle violently in the respirometer.

View larger version (26K): [in a new window]   Fig. 2. Effects of sustained exercise, fatigue, and subsequent recovery, on rates of O2 uptake (O2; mean ± S.E.M.); arterial blood pH (pHa), PO2 (PaO2) and total O2 content (CaO2); red muscle PO2 (PRMO2), and the arterial to red muscle PO2 gradient (PaO2–PRMO2). Data are provided for rainbow trout swimming at two sustained speeds in body lengths s–1 (BL s–1); at their maximum sustained swimming speed (Max); immediately upon fatigue (note that O2 data are not available for this instance), and at 1 h and 2 h of recovery (Rec). NA, data not available. N=5 in all cases, for those variables where exercise elicited statistically significant effects by one-way ANOVA for repeated variables, a common superscript indicates no significant difference between means by Bonferroni post-hoc test (P<0.05).

View larger version (25K): [in a new window]   Fig. 3. (A) Temporal changes (mean ± S.E.M.) in red muscle PO2 (PRMO2, red diamonds) and arterial blood PO2 (PaO2, blue diamonds) in rainbow trout during exposure to mild hypoxia and recovery to normoxia (water PO2, PwO2, shown as the simple line). (B) Percentage changes (mean ± S.E.M.) in PRMO2 (blue diamonds), PaO2 (red diamonds) and PwO2 (simple line), from their respective normoxic values, over the same period. N=6 in all cases.