Network meta-analysis of 55 trials finds cold water immersion aids post-exercise muscle recovery

Researchers pooled data from 55 randomized controlled trials published between 2000 and 2024 to compare how different cold water immersion protocols affect recovery from exercise-induced muscle damage. Across three key outcomes—muscle soreness, jump performance, and a blood marker of muscle breakdown—medium-duration immersions at either low or moderate temperatures consistently outperformed control conditions.

What the study found

The analysis examined three recovery markers: delayed-onset muscle soreness (DOMS), jump performance as a proxy for neuromuscular recovery, and creatine kinase (CK), a blood enzyme that rises when muscle tissue is damaged. Data on DOMS came from 42 trials, jump performance from 36, and CK from 30, giving each outcome a reasonably broad evidence base.

Two immersion protocols stood out across all three outcomes. Both were associated with statistically significant reductions in soreness and CK levels, and with meaningful improvements in jump performance, compared with control conditions. Effect sizes for soreness reduction were moderate to large, while those for jump performance were smaller but still statistically reliable.

When the researchers ranked protocols by cumulative probability, one temperature-duration combination ranked highest for reducing the muscle-damage blood marker and restoring neuromuscular function, while a slightly warmer combination ranked highest for minimizing soreness. The authors note that the two leading protocols performed similarly enough that the practical difference between them may be modest.

The authors conclude that immersion duration and water temperature both influence recovery outcomes, and that the relationship is not simply "colder is better." They call for higher-quality primary studies to confirm these rankings, particularly because network meta-analysis relies on indirect comparisons across trials that may differ in exercise protocols, participant characteristics, and outcome timing.

Limits worth knowing

The 55 included trials varied considerably in the type of exercise used to induce muscle damage, the timing of outcome measurement, and participant fitness levels, all of which could influence how well results generalize. The network meta-analysis framework allows indirect comparisons between protocols that were never tested head-to-head, introducing additional uncertainty. The review searched literature only through September 2024 and was restricted to RCTs, so observational evidence was excluded. No funding source for the meta-analysis itself is disclosed in the abstract. Individual included trials were not screened here for industry sponsorship. The authors explicitly flag limitations in the quality of the underlying studies as a reason to treat the protocol rankings as preliminary.

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.