Cold water therapy is a popular wellness practice, but what does the science actually say? While many users report feeling invigorated, the clinical evidence is still developing. This guide explores the potential benefits and important safety considerations of cold water immersion.
Potential Benefits of Cold Water Therapy
Muscle Recovery
Cold water immersion may help with short-term muscle recovery after exercise. Some studies suggest it can reduce delayed-onset muscle soreness (DOMS) [1]. However, a 2025 systematic review noted that while post-exercise cold-water immersion may improve short-term recovery, regular immediate post-training use can blunt desired muscular size, strength, and power adaptations [2].
Wellbeing and Mood
Many regular cold plunge users report mood-lifting and stress-reducing effects. However, the 2025 systematic review found lower stress only at the 12-hour time point, with no significant stress effect immediately, at one hour, 24 hours, or 48 hours [2]. Claims about treating depression or broadly improving mood are not strongly supported by current evidence [2].
Inflammation and Immunity
While some believe cold water therapy reduces inflammation and boosts immunity, the evidence is mixed. The 2025 meta-analysis actually found an acute increase, not decrease, in measured inflammation immediately and one hour after immersion [2]. Furthermore, it found no significant immediate or one-hour immune effect, and certainty for immunity was inconsistent or inconclusive [2].
Metabolism and Brown Fat
Cold exposure can activate brown adipose tissue (BAT), which generates heat. However, a 2022 review cautions that brown-fat thermogenesis in adults should not be translated into large calorie or weight-loss promises, estimating the effect to be equivalent to less than 20 kcal/day from existing brown-fat deposits under the studied assumptions [3].
Safety Considerations
Cold water therapy is not suitable for everyone. Sudden immersion in cold water (15°C and below) can trigger a cold shock response, causing an immediate increase in breathing, heart rate, and blood pressure [4]. This can stress the heart and increase the risk of abnormal heart rhythms [5].
People with a history of cardiovascular issues, uncontrolled hypertension, or other medical conditions should consult a healthcare professional before starting cold water therapy [5]. Always prioritize safety and listen to your body. A working home dose, if you use one at all, is typically 1–3 minutes at 10–15°C, not 10–15 minutes. Do not plunge alone.
Frequently asked questions
What are the potential benefits of cold water therapy?
Cold water therapy may help with short-term muscle recovery after exercise, though regular use might blunt training adaptations. Some users report mood-lifting effects, but clinical evidence for broad health claims is limited.
Does cold water therapy reduce inflammation?
The evidence is mixed. A 2025 meta-analysis found an acute increase, not decrease, in measured inflammation immediately and one hour after immersion.
Is cold water therapy safe?
Cold water therapy carries risks, including cold shock response which can stress the heart. People with cardiovascular issues or other medical conditions should consult a healthcare professional before starting. A working home dose, if you use one, is typically 1–3 minutes at 10–15°C. Do not plunge alone.
References
| Ref | Source | URL |
|---|---|---|
| [1] | Fundamentals or Icing on Top of the Cake? A Narrative Review of Recovery Strategies and Devices for Athletes | https://www.mdpi.com/2075-4663/11/11/213 |
| [2] | Effects of cold-water immersion on health and wellbeing: A systematic review and meta-analysis | https://pmc.ncbi.nlm.nih.gov/articles/PMC11778651/ |
| [3] | Health effects of voluntary exposure to cold water – a continuing subject of debate | https://pmc.ncbi.nlm.nih.gov/articles/PMC9518606/ |
| [4] | Royal National Lifeboat Institution: Cold water shock | https://rnli.org/water-safety/know-the-risks/cold-water-shock |
| [5] | British Heart Foundation: Cold water swimming | https://www.bhf.org.uk/informationsupport/heart-matters-magazine/activity/cold-water-swimming |