THE CONVERSATION
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The world record for a non-oxygen-assisted breath hold is 11:35 minutes* by Stephane Mifsud. For women it is 9:02 minutes, held by Natalia Molchanova. These are people who have trained for many years, and are the top professional apneists . There are also signals from the brain stem itself and lungs , but they are generally less important in relation to the topic at hand. Accordingly, the rate and depth of breathing is primarily controlled by these chemoreceptors that maintain the optimal level of blood O2 and CO2.
Still, even with 100 per cent O2, CO2 rises during the breath hold. However, fortunately for the oxygen-assisted breath holder, elevated blood O2 blunts the chemoreceptor response to CO2. The combined effect of an absent O2 response, and a dampened CO2 response, allows someone to hold their breath for much longer.Article content
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