What Is Cold Water Immersion? A Plain Guide for Ireland
What cold water immersion is, what the evidence says and who should avoid it.
Cold water immersion means deliberately sitting or standing in cold water, usually somewhere between 5°C and 15°C, for a few minutes. People do it in ice baths, cold plunge tubs, rivers, lakes and the sea.
Research suggests short cold exposure can reduce the sense of muscle soreness after hard exercise and leave many people feeling more alert. Evidence for wider claims, such as improved immunity or mood, is weaker and still being studied.
Cold water carries real risks. Cold shock can cause rapid breathing and a sharp rise in heart rate and blood pressure in the first minute. People with heart conditions, high blood pressure or circulation problems should speak to a doctor first.
Never immerse alone in open water, never go in after drinking alcohol, and get out if you feel dizzy, numb or confused. Start with short exposures and build gradually.
Frequently asked questions
Is cold water immersion safe?
For healthy adults, short immersion is generally tolerated, but cold shock is a real risk. Speak to a doctor first if you have a heart or circulation condition.
How cold should the water be?
Many people use 10°C to 15°C for a few minutes. Colder is not automatically better.