How does anaerobic activity “not use oxygen” if you’re breathing very heavily when you do it?

Question

How does anaerobic activity “not use oxygen” if you’re breathing very heavily when you do it?

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Answer 1

you are gonig into anaerobic breathing because even at your max capacity you still arent being supplied enough oxygen to keep your muscles running at that rate.

the process itself is much less efficient but the body doesnt discriminate where its getting its energy from.