Also known as: cold shower, cold plunge, deliberate cold exposure
Latest evidence update: 2026-03-01
Solid mix of RCTs with some methodological gaps.
Confirmed across many independent studies with significant findings.
Tens of thousands of participants pooled across studies.
Mostly aligned, with some divergence.
Healthy mix of recent and established research.
No per-outcome numbers yet for this one. Each finding's direction and strength is shown in the research below.
Areas where research points to a consistent direction of effect. The strength of evidence is graded; the size of the effect is not quantified.
Brief immersion in cold water (11°C or below) for dopamine release, stress resilience, and metabolic activation.
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Minute ventilation response to cold water immersion habituates with repeated exposure, showing a decrease of 21.3 L per minute (Cohen's d: -1.64).
Whole-body cryotherapy reduces serum IL-1β levels compared to control in humans.
Cold-water immersion applied to trained limbs only attenuates muscular strength gains more than whole-body CWI.
Cold water immersion and cryostimulation increase RMSSD (root mean square of successive RR interval differences), a marker of parasympathetic cardiac autonomic activity.
Cold water immersion improved perceived recovery at 72 hours post-immersion.