Re:Pushing the Limits of Extreme Breath-Holding
by YeGoblynQueenne on Thursday February 01, 2018 @10:07AM
(#16282310)
It gets worse:
Competitive diving: During competitions in breath-hold diving, most divers
hyperventilate extensively and determine the duration of their breath-hold by
means other than the hypercapnic ventilatory drive. Some seem to react to
hypoxia via the urge to breathe, while others actively decide to abort the
breath-hold when vision starts to falter, described as 'greyout' (personal
communication with elite divers).
Competitive diving: During competitions in breath-hold diving, most divers hyperventilate extensively and determine the duration of their breath-hold by means other than the hypercapnic ventilatory drive. Some seem to react to hypoxia via the urge to breathe, while others actively decide to abort the breath-hold when vision starts to falter, described as 'greyout' (personal communication with elite divers).
From:
https://www.diversalertnetwork.org/files/UHMS_DAN_2006_Breat... (Chapter 2, Physiological mechanisms involved in the risk of loss of consciousness during breath-hold diving; pg 27).