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Breath-hold diving as a brain survival response

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  • Published:
Translational Neuroscience

Abstract

Elite breath-hold divers are unique athletes challenged with compression induced by hydrostatic pressure and extreme hypoxia/hypercapnia during maximal field dives. The current world records for men are 214 meters for depth (Herbert Nitsch, No-Limits Apnea discipline), 11:35 minutes for duration (Stephane Mifsud, Static Apnea discipline), and 281 meters for distance (Goran Čolak, Dynamic Apnea with Fins discipline). The major physiological adaptations that allow breath-hold divers to achieve such depths and duration are called the “diving response” that is comprised of peripheral vasoconstriction and increased blood pressure, bradycardia, decreased cardiac output, increased cerebral and myocardial blood flow, splenic contraction, and preserved O2 delivery to the brain and heart. This complex of physiological adaptations is not unique to humans, but can be found in all diving mammals. Despite these profound physiological adaptations, divers may frequently show hypoxic loss of consciousness. The breath-hold starts with an easy-going phase in which respiratory muscles are inactive, whereas during the second so-called “struggle” phase, involuntary breathing movements start. These contractions increase cerebral blood flow by facilitating left stroke volume, cardiac output, and arterial pressure. The analysis of the compensatory mechanisms involved in maximal breath-holds can improve brain survival during conditions involving profound brain hypoperfusion and deoxygenation.

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  1. Department of Integrative Physiology, University of Split School of Medicine, Split, Croatia

    Zeljko Dujic, Toni Breskovic & Darija Bakovic

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  1. Zeljko Dujic
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  2. Toni Breskovic
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  3. Darija Bakovic
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Correspondence to Zeljko Dujic.

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Dujic, Z., Breskovic, T. & Bakovic, D. Breath-hold diving as a brain survival response. Translat.Neurosci. 4, 302–313 (2013). https://doi.org/10.2478/s13380-013-0130-5

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