Peripheral chemoreflex sensitivity and sympathetic nerve activity are normal in apnea divers during training season

Autonomic Neuroscience : Basic & Clinical
Toni BreskovicZeljko Dujic

Abstract

Apnea divers are exposed to repeated massive arterial oxygen desaturation, which could perturb chemoreflexes. An earlier study suggested that peripheral chemoreflex regulation of sympathetic vasomotor tone and ventilation may have recovered 4 or more weeks into the off season. Therefore, we tested the hypothesis that peripheral chemoreflex regulation of ventilation and sympathetic vasomotor tone is present during the training season. We determined ventilation, heart rate, blood pressure, cardiac stroke volume, and muscle sympathetic nerve activity (MSNA) during isocapnic hypoxia in 10 breath hold divers and 11 matched control subjects. The study was carried out at the end of the season of intense apnea trainings. Baseline MSNA frequency was 30+/-4bursts/min in control subjects and 25+/-4bursts/min in breath hold divers (P=0.053). During hypoxia burst frequency and total sympathetic activity increased similarly in both groups. Sympathetic activity normalized during the 30-minute recovery. Hypoxia-induced stimulation of minute ventilation was similar in both groups, although in divers it was maintained by higher tidal volumes and lower breathing frequency compared with control subjects. In both groups, hypoxia increased heart rat...Continue Reading

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Citations

Dec 18, 2013·Respiratory Physiology & Neurobiology·Guillaume CostalatFrédéric Lemaître
Aug 7, 2014·Current Hypertension Reports·Meghna P MansukhaniVirend K Somers
Jul 16, 2010·Autonomic Neuroscience : Basic & Clinical·Craig D SteinbackJ Kevin Shoemaker
Jun 7, 2011·Autonomic Neuroscience : Basic & Clinical·Toni BreskovicZeljko Dujic
Mar 8, 2018·Experimental Physiology·Anthony R BainPhilip N Ainslie
May 12, 2012·Sports Medicine·Zeljko Dujic, Toni Breskovic
Sep 25, 2010·Journal of Applied Physiology·Karsten HeusserZeljko Dujic
Mar 16, 2021·Frontiers in Physiology·Alexis Arce-ÁlvarezDavid C Andrade

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