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Pooled review (meta-analysis)

Pooled review of 13 studies found mixed results for cold water and mood

Ngandeu Schepanski and colleagues · Frontiers in physiology · 2026

Original title: Cold-water exposure and psychological outcomes in adults: a systematic review and meta-analysis.

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What the study found

Mixed

Pooled results leaned toward less depression and stress and better mood, but ranges were wide and shrank in controlled-only analyses. Little sign of benefit for anxiety. Authors say evidence does not show cold water improves mood.

The study at a glance

Type of study
Pooled review (meta-analysis)
Who or what was studied
13 studies, 4,105 people · adults in 13 studies of cold showers, cold baths or winter swimming
What was tested
Cold showers, cold water immersion or winter swimming, compared with no cold or before and after
What it measured
The question itself: muscle recovery, mood and immune health
Who has a stake
No stake declared
No competing interests declared.
Journal
Frontiers in physiology, 2026
Source
PubMed record 42819812. This page is based on the abstract only.

How much this study counts

  • ✓Pools the results of 13 studies with 4,105 people.
  • •A pooled review is only as strong as the studies it pools.
  • ✓Measured the question itself: muscle recovery, mood and immune health.
  • ✓No competing interests declared.
  • •Summarized from the PubMed abstract only. The full paper may hold details the abstract leaves out.

✓ Strength– Limit• Note

These points come from fixed rules about the type of study, its size and length, what it measured, and who has a stake. Every study on Digestery gets the same rules.

Where this study sits

This paper is not on the ladder. It is a pooled review (meta-analysis), and reviews and opinion pieces discuss studies that are already counted on the steps below.

↑ Stronger evidence

  1. Trials in people: muscle recovery and mood

    8

    1 benefit, 1 mixed, 5 no difference, 1 harm

  2. Trials in people: other measures

    8

    2 benefit, 1 mixed, 4 no difference, 1 harm

  3. Trials in people: lab tests or safety

    3

    1 benefit, 2 no difference

  4. Population studies

    3

    2 benefit, 1 mixed

  5. Blood levels and genes

    0

    None among the papers we read.

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “Does cold plunging help recovery and mood?”

Eases soreness a little; mood unproven.

Confidence: low. Based on 30 on-topic papers.

Read the full answer
  • Quoted in “What we found”: A 2026 review of thirteen studies (4105 adults) says evidence does not show cold water improves mood or stress; a review of eleven trials found no mood benefit.
  • Part of the finding “Mood: no clear benefit shown”.
  • Summed up in “What reviews found”: Pooled thirteen studies with 4105 adults on cold showers, cold baths and winter swimming. Results leaned toward better mood and less stress, but most studies had high risk of bias. Authors concluded the evidence does not establish a benefit.
  • Marked as a key paper in the research timeline: Newest review: mood benefit not established.

Other reviews on this question

See all 30 studies on this question

How this page was made

Label

First read of the abstract
Claude Sonnet
Independent second read
Claude Haiku
Differences settled
The two reads differed. The reviewer checked the abstract and kept the first read. Claude Opus 5.5.
Headline
Claude Sonnet, from the checked study record. A script checked its numbers and wording.
Numbers
Checked against the abstract by a script
“How much this study counts”
Fixed rules, the same for every study
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