Was a blackout to blame for ironman’s drowning?

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Shallow water blackout – sometimes called hypoxic blackout – results from an insufficient amount of carbon dioxide to activate the body’s natural impulse to breathe.

According to USA-based Aquatic Safety Research Group, by rapidly breathing deeply prior to submersion, swimmers blow off an excessive amount of carbon dioxide.

When the oxygen level in the blood runs low before the carbon dioxide level rises to the point that triggers the breathing reflex, the swimmer loses consciousness.

The swimmer never actually feels as though a breath is needed, the group says.

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