Could my heart hold stopped?

I did an experiment on myself to see if I had a diving reflex.

I took a really hot sauna and got my heart rate up to 160 (heart rate monitor on) and dunked my entire body including my head underwater surrounded by a "soaker style tub" filled with cold water and 3 40# stacks of ice.

My heart rate went from 150 to about 50 within 45 seconds.

I'm 51 years old and in polite shape with resting heart rate of about 56.

Could this experiment have be dangerous? Could it have stopped my heart?

I did get really dizzy and the in one piece room was spinning for about 5 minutes after the experiment.
Answers:
Yeah, sounds incredibly dangerous. You could put your body into shock.
I have an answer that's in a question form:
Can you type?
The answer is yes to both question. This time, you were unlucky. Next time, slit your wrist too. Twice as effective. Source(s): Friend did it.
I don't know,but that is extreme by greater than 50%
I think you could crash your circulation.
yes it could enjoy! please be safe
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Yes, that was hazardous. You can bet that you have some coronary artery disease at your age (and I'm older and also have no symptoms). I wouldn't repeat the experiment.
No, you'll not stop your heart, though a "sinus arrest" of several second is possible.
That was just awfully stupid. I mean seriously what the hell! It could hold been very dangerous. Yes it could enjoy kill you even more if you're 51.
It's unlikely that your heart would have stopped. You might have faint, however, which could have been disastrous if you were still contained by the plunge pool.
yes you could have died from shock, basically like a fish when you change tanks. sounds approaching an awesome expierment i wish i was your buddy, we would be doing stuff like that adjectives the time!
I don't know why you would do that, but it sure was awesome. Get video subsequent time.
Psh, that would be benificial for me! As my resting heart rate is always around 110 or if not higher!
No, not possible.
could be...

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