• Respir Physiol Neurobiol · Feb 2014

    Cardio-ventilatory responses to poikilocapnic hypoxia and hypercapnia in trained breath-hold divers.

    • Guillaume Costalat, Aurélien Pichon, Jeremy Coquart, Fabrice Bauer, and Frédéric Lemaître.
    • Faculté des sciences du sport, CETAPS, EA n°3832, Université de Rouen, France. Electronic address: guillaume.costalat1@univ-rouen.fr.
    • Respir Physiol Neurobiol. 2014 Feb 1; 192: 48-54.

    AbstractTrained breath-hold divers (BHDs) are exposed to repeated bouts of intermittent hypoxia and hypercapnia during prolonged breath-holding. It has thus been hypothesized that their specific training may develop enhanced chemo-responsiveness to hypoxia associated with reduced ventilatory response to hypercapnia. Hypercapnic ventilatory responses (HCVR) and hypoxic ventilatory responses at rest (HVRr) and exercise (HVRe) were assessed in BHDs (n=7) and a control group of non-divers (NDs=7). Cardiac output (CO), stroke volume (SV) and heart rate (HR) were also recorded. BHDs presented carbon dioxide sensitivity similar to that of NDs (2.85±1.41 vs. 1.85±0.93Lmin(-1)mmHg(-1), p>0.05, respectively). However, both HVRr (+68%) and HVRe (+31%) were increased in BHDs. CO and HR reached lower values in BHDs than NDs during the hypoxic exercise test. These results suggest that the exposure to repeated bouts of hypoxia/hypercapnia frequently experienced by trained breath-hold divers only enhances their chemo-responsiveness to poikilocapnic hypoxia, without altering HCVR. Copyright © 2013 Elsevier B.V. All rights reserved.

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