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Energy Turnover in the Normoxic and Anoxic Turtle Heart

We examined the possibility that the heart of the turtle Chrysemys scripta is an exceptional anaerobic performer, by measuring myocardial power output, lactate output, and estimated ATP turnover in perfused heart preparations. Over a range of myocardial power outputs at 5 and 15°C we find that turtl...

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Published in:Comparative biochemistry and physiology. A, Comparative physiology Comparative physiology, 1997-05, Vol.117 (1), p.121-126
Main Authors: Arthur, Peter G, Franklin, Craig E, Cousins, K.L, Thorarensen, H, Hochachka, P.W, Farrell, A.P
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container_title Comparative biochemistry and physiology. A, Comparative physiology
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description We examined the possibility that the heart of the turtle Chrysemys scripta is an exceptional anaerobic performer, by measuring myocardial power output, lactate output, and estimated ATP turnover in perfused heart preparations. Over a range of myocardial power outputs at 5 and 15°C we find that turtle hearts perfused with anoxic saline do not show a particularly outstanding ability to produce ATP anaerobically. Furthermore, at 15°C anoxia reduced the ATP turnover rate to 50% of the normoxic rate. At 5°C the anoxia-induced depression of ATP turnover was even more pronounced, being 4-fold lower than the normoxic rate. In addition, anoxia at 5°C reduced the basal metabolic rate of the turtle heart. We conclude that long-term cardiac tolerance of hypoxia in this species is more likely related to metabolic depression rather than to an exceptional anaerobic performance.
doi_str_mv 10.1016/S0300-9629(96)00283-6
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subjects Adenosine Triphosphate - metabolism
Anaerobic Threshold - physiology
Animals
anoxia
ATP
cardiac
cardiac output
Chrysemys scripta
Energy Metabolism
Freshwater
glycolysis
Glycolysis - physiology
heart rate
Hypoxia
Hypoxia - metabolism
lactate
Lactic Acid - metabolism
metabolic rate
Myocardium - metabolism
Oxygen Consumption
Physical Exertion - physiology
Space life sciences
Temperature
Turtles
title Energy Turnover in the Normoxic and Anoxic Turtle Heart
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