Cold-water immersion survey links frequency with mental health and illness duration
People practicing cold-water immersion reported better mental health and shorter respiratory illnesses, but the survey cannot show that immersion caused those differences.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Cold-water immersion was associated with better self-reported mental health and shorter upper respiratory infections and related sick leave. Associations were most favorable at twice weekly; more frequent immersion was linked to worse results. Because this was an observational survey, the pattern does not establish a beneficial schedule or prove that cold exposure improves immunity.
All outcomes were self-reported, and the abstract does not specify the illness recall period or fully describe the control group. Statistical adjustment cannot establish cause and effect.
What the survey measured
Participants completed a questionnaire covering physical symptoms, anxiety and insomnia, social functioning and depressive symptoms. They also reported days of respiratory illness and related sick leave. These measures do not directly assess immune function.
What adjustment can tell us
Researchers accounted for sex, age, multiple illnesses, temperament and mindfulness. That helps interpret the comparisons, but people choosing cold-water immersion may still differ from controls in ways the survey cannot resolve.
The original publication
Inverted "u-shaped" association of cold-water immersion frequency with mental health and upper respiratory tract infection: a cross-sectional study.
Czarnecki J, Mokros Ł
Brain Behav Immun Health · 2025
- PubMed ID
- 41127868
- Record checked
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