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Advan. Physiol. Edu. 33: 72-77, 2009; doi:10.1152/advan.90188.2008
1043-4046/09 $8.00
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ADV PHYSIOL EDUC 33:72-77, 2009
© 2009 American Physiological Society

RESEARCH-ARTICLE

Exercise- and hypoxia-induced anaerobic metabolism and recovery: a student laboratory exercise using teleost fish

B. B. Rees1, P. Boily1,2 and L. A. C. Williamson1

1Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana; and 2Department of Biology and Environmental Sciences, Western Connecticut State University, Danbury, Connecticut

Address for reprint requests and other correspondence: P. Boily, Dept. of Biology and Environmental Sciences, Western Connecticut State Univ., 181 White St., Danbury, CT 06810 (e-mail: boilyp{at}wcsu.edu).

Abstract

Anaerobic metabolism is recruited in vertebrates under conditions of intense exercise or lowered environmental oxygen availability (hypoxia), typically resulting in the accumulation of lactate in blood and tissues. Lactate will be cleared over time after the reoxygenation of tissues, eventually returning to control levels. Here, we present a laboratory exercise developed as part of an upper-level vertebrate physiology class that demonstrates the effects of exercise and hypoxia exposure on blood lactate in fish and the subsequent decrease in lactate during recovery. Typically, the results obtained by students demonstrate that both treatments cause significant increases in blood lactate concentrations (two to three times higher than control values) that decrease back to normal values within 3 h of recovery under normoxia. The procedures described are generally applicable to other fish species and provide an alternative to using humans or other mammalian species to investigate anaerobic metabolism.

Key words: lactic acid; oxygen






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