Sam on Instagram: "Cold water immersion triggers an immediate “cold shock response,” characterized by a reflex gasp, rapid hyperventilation, and increased heart rate and blood pressure. This initial reaction, lasting 1–2 minutes, is accompanied by peripheral vasoconstriction to conserve heat, a surge of adrenaline and endorphins, and potential panic. These responses are designed to protect the body, but can be dangerous if not prepared. Immediate Physiological Responses (0–2 Minutes) * Cold Shoc