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Old 12-02-2016, 06:27 AM   #57
Mullins
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Join Date: Jan 2005
Location: Wellington
Posts: 224
Re: How long can you hold your breath?

I know the brain cannot respire anaerobically. That's kind of the point. Your muscles can, and since you have a limited O2 reservoir you want to deprive your muscles of O2 as much as possible, keeping the oxygenated blood in that heart/lungs/brain circuit. This is why we avoid warm-ups for deep dives for example. Feels horrible because of all the lactic but you stay conscious longer.

Being aerobically fit means being highly vascularised, having big cardiac output etc. Those aren't helpful things if you're trying to reduce oxygenation of your muscles under workload.
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