I have one and do it 3 - 4 times a week. The dopamine response after is great. My tub is set to 52deg and I stay in for about 3 - 3:30 mins
What Happens During Stage 1 of Cold Water Immersion (CWI)?
As soon as you immerse yourself in cold water, your body reacts immediately, triggering the cold shock response. This first phase is marked by a steep heart rate and blood pressure increase, sometimes accompanied by involuntary gasping and rapid breathing. Your body's sympathetic nervous system also kicks into high gear, releasing a surge of adrenaline. This is a survival mechanism designed to keep your muscles primed and ready to act in potentially dangerous situations. Stay calm, control your breathing, and avoid panicking to navigate this initial shock effectively.
How long it lasts: Typically the first 0-2 minutes of CWI
What Happens During Stage 2 of Cold Water Immersion?
As you move into the second stage of CWI, your body begins to adapt to the cold temperature. Blood vessels constrict to preserve core body temperature, diverting blood flow away from extremities like hands and feet to protect vital organs. This vasoconstriction can lead to numbness and tingling in the fingers and toes, but the body periodically restores blood flow to the areas to prevent tissue damage. This cycle of constricting and dilating can improve peripheral circulation and overall vascular health. This stage is also where many people report enhanced mental clarity and alertness.
How long it lasts: Around 2-3 minutes
What Happens During Stage 3 of Cold Water Immersion?
In the third stage of CWI, your body enters thermogenesis to maintain its core temperature. This manifests in symptoms like shivering as your muscles contract to generate heat. Stage 3 also releases a significant amount of endorphins, the body's natural painkillers. These are what cause the euphoric feelings often experienced after a cold plunge. While prolonged exposure at this stage can be dangerous, brief and controlled exposure has benefits that include brown fat activation, reduced inflammation, and more.
How long it lasts: Usually 3-5 minutes