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• A quick demonstration of the Mammalian Diving Reflex. Here, I dunk my face in cold water for a few seconds, lowering my heart rate from the 100s, into the 60s. • Dunking your face into cold water stimulates the trigeminal nerve, which sends signals to the brain to activate the parasympathetic nervous system via the vagus nerve, thereby lowering heart rate. • Physiological responses include: \t•\tLowered heart rate \t•\tConstriction of blood vessels in the extremities to shunt blood toward the
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Three vagus nerve benefits from a cold water face dip:1.Triggers the mammalian dive reflex. When cold water hits your face (especially forehead, eyes, cheeks), it activates the trigeminal nerve which signals the vagus nerve directly. Heart rate drops immediately — sometimes 10-25% within seconds. This forces your body out of fight-or-flight and into a parasympathetic (calm-down) state. It's one of the fastest vagal activation methods that exists.2.Lowers sympathetic nervous system arousal. The c
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