I be competent to hold my breath underneath dampen by doing this?

I can hold my breath for about 45 seconds.

But when I get my heart rate up to 160 by going into a sauna and at once dunking my whole body including my head in rime cold water, I can hold it for 120 seconds or so.

I have a sauna and a "soaker tub". I bursting my tub with cold water and 3, 40# bags of rime.

My heart rate went from 150 down to almost 45 or so rather quickly.

I feel like I could stay under water and hold my breath forever!

Is this the primitive diving reflex within humans?
Answers:
Well, think about it. If your heart rate is down, it is pumping less oxygen. If you are need less oxygen because your heart rate is down, then you can go longer short it. I don't know however if their are negative effects if you do this often though. I would look it up on some type of swimming site.

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