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THERAPIES & TRADITIONS · GUIDE

Cold-Water Immersion, Cold Showers and Contrast-Water Practices

Cold-water immersion, cold showers and contrast water in a hydrotherapy context: what reviews found for recovery, mood and illness, and why cold shock and drowning risk come first.

Content last updated . This page has not been medically reviewed.

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What This Page Covers

Cold plunges, ice baths and cold-water swimming overlap with the Biohacking section, which owns the detailed evidence. This page gives the hydrotherapy view and points you there: cold-water immersion evidence summary, cold and heat exposure and the claim check on cold plunges and immunity. The hub page Where cold plunge and ice bath evidence is covered explains the split.

A 2017 review of the whole field found the evidence behind the claims made for cold-water immersion varies, and for some claims the supporting data remain at the level of anecdotal speculation. [3]

Cold-Water Immersion After Exercise

4 findings · 1 supported · 2 mixed · 1 limited or unclearThe colour follows the evidence label on each card.

  1. Muscle soreness after exercise

    Mixed

    A Cochrane review of 17 small trials (366 people) found some evidence that cold-water immersion reduced delayed onset muscle soreness compared with passive rest; study quality was low and most trials did not track adverse events [4]

  2. Recovery after hard exercise

    Promising but limited

    A meta-analysis of 52 studies found better muscular power, soreness and perceived recovery 24 hours after high-intensity exercise, but no effect on strength recovery [5]

  3. Mood, stress, wellbeing

    Insufficient evidence

    A 2026 meta-analysis of 13 studies (4,105 people) said the evidence does not establish benefit, and most studies had high or serious risk of bias [6]

  4. Mixed outcomes in healthy adults

    Mixed

    A 2025 review of 11 trials found an acute rise in inflammation after exposure and a stress reduction only at 12 hours; its authors called the evidence base constrained by few trials and small samples [7]

These trials cannot hide the cold from participants, so expectation can shape reports of feeling better. Exercise-recovery findings come mostly from athletes and active people. None of this supports cold water as a treatment for a medical condition, and it should not replace care for depression, anxiety or injury.

Cold Showers

Cold showers are a gentler form of cold exposure but the evidence is thin. See Cold showers: what research shows and what is claimed for the trials. Cold showers and cold swimming outdoors are discussed in open-water and cold-water swimming.

Contrast-Water Practices

Contrast water therapy means alternating warm and cold water. A 2013 meta-analysis of 18 trials, all at high risk of bias, found it superior to passive rest for recovery after exercise, with little evidence it beat other popular recovery methods. [8] In the Cochrane review, five studies comparing cold-water with contrast immersion found no evidence of a difference in pain. [4] Label: mixed. For a side-by-side look, see warm vs cold water immersion. Evidence on contrast showers for general health: proper evidence not found in the reviews read for this page (PubMed searches on cold showers and contrast water).

Frequently asked questions

Are ice baths good for muscle recovery?

They may reduce soreness compared with rest, based on small, low-quality trials, but they do not improve every recovery measure. [4][5]

Do cold showers boost the immune system?

In one large trial, cold showers did not change the number of illness days, though self-reported sickness absence was lower. [10]

Is a cold plunge safe?

It can be dangerous, particularly for people with heart or rhythm problems or when done alone, because of the cold shock response. [1]

Does cold water help depression?

Current evidence does not establish this, and cold water should not be a stand-alone treatment for psychiatric disorders. [6]

Should I hold my breath or hyperventilate before a plunge?

No. Do not do this in or near water. See the linked breathwork safety page.

More details: evidence, limits and cautions

The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.

Safety First: Cold Shock and Drowning
Cold water is not a gentle exposure. A review in the Journal of Applied Physiology describes a cold shock response that begins within seconds of immersion and can cause death through breathing in water, reduced blood flow to the brain, and heart rhythm problems before the body core has cooled. [1] The same review calls cold water immersion a significant cause of open-water drowning. [1]

Points that follow from the sources:

  • Do not enter cold water alone or after drinking alcohol. The World Health Organization (WHO) links swimming alone, and drinking alcohol before swimming alone, with higher drowning risk. [2]
  • Do not use breath-holding or deliberate hyperventilation in or near water. This site describes those practices only to warn against them: see breathwork safety and Wim Hof-style breathing and water.
  • If someone collapses or cannot get out of cold water, call emergency services (911 in the US) and do not go into the water yourself.
  • This site gives no safe temperature or time. Limits depend on the person and the setting. See the hydrotherapy safety guide and cold shock, hypothermia and afterdrop.
Who Should Check With a Clinician First
People with heart disease, rhythm problems, high or low blood pressure, Raynaud's phenomenon, pregnancy or a history of fainting should ask a clinician before trying cold immersion. The NHS describes Raynaud's as blood not flowing properly to the fingers and toes, and advises people with it to try to avoid sudden changes in temperature. [9] Older adults and children need extra supervision. More in heart attack, arrhythmia and sudden cardiac risks.
References
  1. Journal of Applied Physiology (2026), cold water immersion and drowning narrative review. PubMed record. Read 2026-10-22.
  2. World Health Organization. Drowning fact sheet. Read 2026-10-22.
  3. Experimental Physiology (2017), Cold water immersion: kill or cure? PubMed record. Read 2026-10-22.
  4. Cochrane Database of Systematic Reviews (2012), cold-water immersion for muscle soreness after exercise. PubMed record. Read 2026-10-22.
  5. Sports Medicine (2022), cold-water immersion and recovery after strenuous exercise, systematic review and meta-analysis. PubMed record. Read 2026-10-22.
  6. Frontiers in Physiology (2026), cold-water exposure and psychological outcomes, systematic review and meta-analysis. PubMed record. Read 2026-10-22.
  7. PLOS ONE (2025), cold-water immersion in healthy adults, systematic review and meta-analysis. PubMed record. Read 2026-10-22.
  8. PLOS ONE (2013), contrast water therapy and exercise-induced muscle damage, systematic review and meta-analysis. PubMed record. Read 2026-10-22.
  9. NHS. Raynaud's. Read 2026-10-22.
  10. PLOS ONE (2016), randomized trial of a routine hot-to-cold shower on sickness absence. PubMed record. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.