Key result
Cold anoxia attenuates both cholinergic and adrenergic cardiovascular control in freshwater turtles.
Why the study?
Cardiovascular control in cold-acclimated freshwater turtles during chronic anoxic exposure is not well understood.
Population
Red-eared slider turtles (Trachemys scripta) acclimated to 22 °C or 5 °C
Comparison
Acute (6 h) anoxia at 22 °C or chronic (22 days) anoxia at 5 °C versus normoxic conditions
Design
In vivo physiological study with pharmacological interventions
Follow-up
Up to 22 days
Authors
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Attenuated autonomic control during cold anoxia in turtles challenges the tested hypothesis; leaves open mechanisms of cardiac downregulation for further study.
In freshwater turtles, cholinergic and adrenergic control of the cardiovascular system is attenuated during cold anoxic conditions, likely facilitating their depressed physiological state.
Hicks et al. (2000) studied Cardiovascular control during anoxia. Cold acclimation and anoxic exposure vs. 22 degrees C acclimation and normoxic conditions was evaluated on Cardiovascular status (heart rate, systemic resistance, cardiac output). Cold anoxic conditions attenuated both cholinergic and adrenergic control of the cardiovascular system in freshwater turtles, contrary to the hypothesis of increased cholinergic inhibitory tone.
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