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I remember somebody mentioned if they drink ice water after exercising and getting really hot, it can cause them to pass out. Anybody have the details on that

I remember somebody mentioned if they drink ice water after exercising and getting really hot, it can cause them to pass out. Anybody have the details on that effect?

bonzini 6y ago
It's true and it happens when nerves around the stomach (called vagus nerve) react to the cold by sending a signal to the brain. Because among other effects signals from the vagus nerve reduce cardiac frequency, you can indeed pass out as a result. Not a doctor, but it happened to my wife and it was a little scary.