Abstract
IT has been known for nearly a century that bradycardia is a common feature of the circulatory response to the asphyxia of diving. Heart slowing has been observed in a wide variety of both aquatic and terrestrial animals during submersion1–3. Several lines of evidence indicate that this bradycardia is associated with a decreased cardiac output and widespread arterial vasoconstriction with vastly diminished blood flow in viscera and skeletal muscle2,4,5. Flow in the cerebral and coronary circulations appears to be sustained.
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References
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ELSNER, R., KENNEY, D. & BURGESS, K. Diving Bradycardia in the Trained Dolphin. Nature 212, 407–408 (1966). https://doi.org/10.1038/212407a0
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DOI: https://doi.org/10.1038/212407a0
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