
Cold water therapy delivers brief relief, with uncertain long-term gains, study finds
Researchers from the University of South Australia conducted a comprehensive review and meta-analysis of 11 studies with 3,177 participants to assess cold water immersion. They found that it can temporarily reduce stress (about 12 hours) and may improve sleep and reduce illness-related absences in some cases, with brief cold showers showing small quality-of-life gains. However, benefits are often short-lived, highly context-dependent, and not guaranteed across populations. A temporary inflammatory spike occurs after exposure, which may aid adaptation rather than signal harm. Caution is advised for people with pre-existing health conditions, and more high-quality, long-term research is needed to identify who benefits most and how best to implement cold-water exposure.





