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Two days ago, I experienced my most recent black-out. It had been 1-1/2 years since my previous one, and I had basically forgotten that I had to be wary of the situation.
Anyway, here's how mine happened:
I hadn't eaten since 9:00 a.m. and about 4:00 p.m., I had a triple cheeseburger. Then, I went to play hockey. I put heat rub on my back to loosen-up, skated for about 3 minutes in a warm-up, and then I watched from the bench as other players skated.
Suddenly, I felt very faint/dizzy and I immediately knew what was coming, so I sat down on the bench. I was awakened about 2 minutes later by other hockey players who were trying to take off my helmet.
To make a long story short, I believe these were the factors that caused my black-out: 1. dehydration 2. too many carbs (all of a sudden) 3. high body temperature (from the heat rub) 4. anxiety/stress (from skating for a few minutes).
So I do think that having plenty of fluids (especially something high in electrolytes like salt) would better regulate body temperature, and blood pressure to avoid the fainting.