NDD,
Just before 2000, there was a study performed on the British Freediving team to determine if their ability to hold their breaths was a function of physical abnormality or mental ability to minimize the stress response and thereby maintain normal, and lesser, bodily requirements for oxygen. The results were inconclusive.
It makes sense, though, that as your body needs more oxygen when stressed, your ability to hold your breath for a long time is at least partially determined by your ability to control your stress response.
HTH,
Solid
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