BlogNovember 9, 20268 min read

Does contrast water therapy help you recover after training?

Pedro RodriguesFounder of Actus
Bruna GüntherFounder of Actus

A 2026 meta-analysis of 10 studies and 199 athletes found that contrast water therapy, switching between hot and cold water after hard exercise, lowered perceived exertion compared with passive rest (Hedges' g of −1.009). It did not significantly reduce muscle soreness or creatine kinase, a blood marker of muscle damage. For lifters, it may help you feel more recovered, but the evidence is low certainty and does not show faster physical repair.

Contrast water therapy means moving back and forth between warm and cold water after training. It is popular in team sports and is now easy to copy at home with a shower or a gym with a cold plunge next to a hot tub. The new review asks a simple question: does it help athletes recover better than just resting?

What did the study do?

Liang and colleagues pooled every trial they could find that compared contrast water therapy with passive recovery, meaning sitting or lying still after exercise. They searched five research databases and used a three-level meta-analysis. That method lets one study contribute several results, for example soreness measured at more than one time point, without counting that study as if it were several separate studies.

Item	Detail
Journal and year	Frontiers in Physiology, 2026
Design	Systematic review and three-level meta-analysis
Studies included	10
Participants	199 athletes
Age	Group averages from 15.5 to 26.2 years
Comparison	Contrast water therapy versus passive recovery
Outcomes	Perceived exertion (Borg scale), muscle soreness (visual analogue scale), creatine kinase (CK)
Evidence grading	Risk of Bias 2.0 tool and GRADE certainty ratings

The outcomes matter for how you read the result. Two of the three are feelings that athletes rate on a scale. Only CK is a blood measure, and it is a surrogate: it hints at muscle damage but is not the same as strength or performance coming back.

What did it find?

Perceived exertion dropped. Across 5 studies and 10 effect sizes, contrast water therapy lowered perceived exertion compared with passive recovery, with a Hedges' g of −1.009 (95% CI −1.672 to −0.346; P = 0.007). Hedges' g is an effect size in standard deviation units, so a value near 1 is large on paper. The authors rated the certainty as low.
The studies did not agree with each other very well. Heterogeneity for perceived exertion was 70.41%, which means the size of the benefit changed a lot from study to study.
Muscle soreness did not change significantly. Across 5 studies and 12 effect sizes, the effect on soreness was g = −0.439, with a 95% CI from −1.619 to 0.741 and P = 0.431. The interval crosses zero, so the true effect could be a benefit, nothing, or a small harm. Heterogeneity was 93.85% and certainty was very low.
CK did not change significantly either. Across 3 studies and 6 effect sizes, g was −0.257 (95% CI −0.614 to 0.100; P = 0.123), with low certainty. The studies were consistent here (heterogeneity of 0%), but there were only a few of them.

The authors are careful about their own headline. In their words, "the available evidence remains insufficient to draw strong conclusions about the reliability or practical magnitude of this effect." They also say the null results for soreness and CK do not prove that contrast water and rest work the same. Both readings are open.

How does this compare with earlier evidence?

Cold water alone has a larger body of evidence than contrast water. A 2022 Sports Medicine meta-analysis by Moore et al. pooled 52 studies comparing cold-water immersion with passive recovery. At 24 hours after high-intensity exercise, cold water reduced muscle soreness (SMD −0.89) and serum CK (SMD −0.85), and improved perceived feelings of recovery (SMD 0.66). So cold water alone showed effects on soreness and CK that the new contrast water review did not find.

A second 2022 review by the same team compared cold water with other recovery methods across 28 studies. It concluded that cold water was more effective than active recovery, contrast water therapy and warm-water immersion for most recovery outcomes. That fits the new result: contrast water may help how you feel, but it has not beaten plain cold water in head-to-head comparisons.

The picture is not one-sided. A 2024 network meta-analysis by Chen et al. ranked recovery methods across 57 studies with 1220 healthy participants. It ranked contrast water first for recovering CK (SUCRA 79.9%), while cryotherapy ranked best for delayed onset muscle soreness (SUCRA 88.3%). SUCRA is a ranking score, not an effect size, so it tells you which method came out on top, not by how much. The new review found no significant CK effect against passive rest, so the two papers point in different directions on CK.

Finally, a 2025 PLoS One meta-analysis by Cain et al. looked at cold-water immersion for general health in 11 studies with 3177 participants. It is not about sport recovery, but it is a reminder that cold exposure has real body effects: inflammation rose immediately after cold water (SMD 1.03). Contrast water includes cold phases, so it is not a neutral habit.

What are the limits?

Small evidence base. The review has 10 studies and 199 athletes in total, and the CK result rests on just 3 studies.
Mostly feelings, not performance. The one significant result is perceived exertion. The review did not pool strength, power or sprint outcomes, so you cannot say contrast water helps you lift more in the next session.
Blinding is impossible. Athletes know whether they sat in alternating hot and cold water or rested. Self-rated outcomes are the ones most open to expectation effects.
Low and very low certainty. The GRADE ratings were low for perceived exertion and CK and very low for soreness.
Young athletes. Group average ages ran from 15.5 to 26.2 years. Results may not carry over to recreational lifters, older trainees or people with health conditions.
No protocol answer. The summary does not tell you which water temperatures, time splits or session lengths worked best.

What should you do with it?

If you already like contrast showers or baths after hard sessions, there is no reason to stop. The review found a lower perceived exertion compared with rest, so it may help you feel fresher.
If your goal is less soreness or faster muscle repair, do not expect contrast water to deliver it. Soreness and CK did not change significantly, and earlier reviews favour plain cold water over contrast water for most outcomes.
If you are time-poor, skip it without guilt. The benefit is low certainty and limited to how you feel, so sleep and sensible training load deserve your time first.
Older lifters and anyone with a heart or circulation condition should get medical advice before using cold or contrast water. The studies were in young athletes, and cold water produces a short-term inflammatory response.

Is contrast water therapy better than an ice bath?

The new review did not compare the two. A 2022 review by Moore et al. found cold-water immersion was more effective than contrast water therapy for most recovery outcomes. A 2024 network meta-analysis ranked contrast water first for CK recovery. On balance, cold water alone has the stronger case for soreness.

Does contrast water therapy help muscle growth or strength?

This review cannot answer that, because it measured perceived exertion, soreness and CK, not muscle size or strength. It looked at recovery in the short term after hard exercise, not long training programmes. Treat any claim that it builds muscle as unsupported by this paper.

Sources

This brief was drafted with AI from the sources listed above and passed automated source checks before publishing. Pedro Rodrigues, founder of Actus, is the responsible author.

Educational content, not medical advice. Training and diet changes carry risk; stop if you feel pain and talk to a physician before changing your program.