Narrative review weighs cold-water immersion's recovery gains against its muscle-growth costs

A 2026 narrative review in Experimental Physiology synthesised the available evidence on cold-water immersion as a post-exercise recovery tool, examining both its acute physiological effects and its longer-term influence on training adaptations. The review found that the same practice that reliably speeds recovery and reduces soreness in the short term appears to blunt the muscle-building signals that accumulate over weeks of resistance training.

What the study found

The review identified a consistent short-term benefit: cold-water immersion was associated with faster restoration of parasympathetic nervous system activity after exercise and with meaningful reductions in perceived muscle soreness in the 24-to-72-hour window that follows a training session. A network meta-analysis cited within the review placed cold-water immersion near the top of recovery modalities for soreness relief.

However, the same body of evidence points to a cost when immersion is used repeatedly alongside resistance training aimed at building muscle. Molecular signalling pathways involved in muscle protein synthesis, the growth of type II muscle fibres, and the addition of new cell nuclei to muscle tissue were all found to be suppressed following cold-water immersion, and these cellular changes were associated with modest but measurable reductions in strength gains over training blocks.

Adaptations relevant to endurance — including improvements in small blood vessels and mitochondrial function — appeared less vulnerable to this suppression and may in some cases be selectively supported by cold-water immersion, suggesting the trade-off is not uniform across all types of training.

The authors conclude that cold-water immersion's effects are neither broadly helpful nor broadly harmful, but are instead predictable based on the training context. They frame the central tension as a recovery-versus-adaptation paradox: the biological mechanisms that make immersion effective for short-term recovery are the same ones that interfere with the long-term structural changes resistance training is meant to produce.

Limits worth knowing

As a narrative rather than systematic review, the synthesis reflects the authors' interpretive choices about which evidence to include and how to weight it, and is more susceptible to selection bias than a pre-registered systematic review would be. The molecular evidence underpinning the hypertrophy-attenuation argument draws heavily on studies with small samples and surrogate endpoints rather than direct measures of muscle growth over full training seasons. The population discussed is primarily trained athletes and clinical rehabilitation patients, which may limit how well the findings generalise to recreational exercisers. Funding sources for the review itself are not disclosed in the available abstract. The review also does not address populations with specific health conditions, older adults, or those new to exercise, where the risk-benefit calculation could differ substantially.

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.