Cold-water immersion after resistance training may slightly reduce strength gains, meta-analysis finds

Researchers pooled data from ten controlled studies involving 170 participants to examine whether cold-water immersion applied after resistance training sessions affects long-term muscular strength development. The combined analysis found a small but statistically significant reduction in strength gains when cold-water immersion was used, though the effect varied depending on whether immersion covered only the trained limb or the whole body.

What the study found

The primary finding of this meta-analysis runs counter to the common assumption that cold-water immersion is a straightforwardly beneficial recovery tool for strength athletes. Across all ten included studies, cold-water immersion was associated with a small reduction in muscular strength gains compared to control conditions, with an effect size of −0.23 — a statistically significant but modest difference.

When the researchers separated studies by immersion type, the picture became more nuanced. In studies where cold water was applied only to the limb being trained, the attenuation of strength gains was somewhat larger (effect size −0.31) and remained statistically significant. In contrast, studies using whole-body immersion showed no meaningful difference in strength outcomes between the cold-water and control groups, and that comparison did not reach statistical significance.

The authors assessed the methodological quality of included studies using a standardized checklist and rated them as good or fair overall. A random-effects model was used to account for variability across study designs, populations, and protocols. The authors note that the overall effect, while statistically significant, sits at the lower boundary of its confidence interval and should be interpreted with appropriate caution.

The authors conclude that the relationship between cold-water immersion and strength adaptation is not uniform and that individual context — including the type of immersion and the training goals of the individual — appears to matter when interpreting these results.

Limits worth knowing

The meta-analysis included only ten studies with a combined sample of 170 participants, 92% of whom were male, which substantially limits how broadly the findings can be applied, particularly to women. The included studies varied in immersion protocols, training programs, and outcome measurement methods, introducing heterogeneity that the random-effects model only partially addresses. Study duration and the specific timing of immersion relative to training sessions also differed across the literature. Funding sources for the individual included studies were not discussed in the abstract, and the review itself does not disclose industry support. Outcomes beyond muscular strength — such as hypertrophy, power, or subjective recovery — were outside the scope of this analysis.

About this entry. The Heartwood Review summarizes published, peer-reviewed research in its own words and links to the original source. It is not medical advice; consult a physician before beginning or changing any thermal or recovery practice. Findings summarized here describe the study cited, not any product sold by Teak & Marble Atelier. Corrections.