Cold Plunges for Soreness and Muscle Growth

A cold plunge after hard training can make your legs feel less sore the next day. Feeling less sore is one outcome. Lifting or sprinting better in the next session is another, and adding muscle over a training block is a third. The human evidence treats them separately. Soreness relief has the most consistent support. Next-session performance shows a small improvement in muscular power recovery 24 hours after high-intensity exercise, with mixed results on other tests. Repeated plunges right after lifting may reduce muscle growth by an amount current trials cannot pin down.¹²¹¹⁴

That gives a lifter or hybrid athlete a narrower question than "do ice baths work." Which outcome does this week depend on, and is a plunge worth the time and the possible cost to growth? The answer changes between a muscle-gain block, a weekend tournament and a rest day.

01Choose the recovery outcome

"Recovery" covers four outcomes that run on different clocks. Soreness is how tender and heavy the muscles feel, and it usually peaks a day or two after hard or unfamiliar work. Next-session performance is what you can lift, jump or run the next time you train. Strength is the trend in your heavy sets across weeks. Hypertrophy is the increase in muscle size across weeks and months of training.

A cold plunge has its clearest support on the first outcome, a small measured benefit alongside mixed results on the second, and trial evidence of a possible cost on the fourth. Strength sits in between, with one trial showing a cost and another showing none. That spread explains why one athlete swears by the tub and another drops it after reading about muscle growth. They are measuring different things.

Feeling less sore after a plunge and gaining muscle over a training block are different outcomes. The growth concern comes from repeated immersion soon after lifting, not every cold exposure.²⁴

Pick the row your week depends on before you fill the tub. The sauna comparison for lifters asks whether heat adds anything after training. Cold carries measured benefits and a measured possible cost, so the decision depends on which outcome you need more.

02Less soreness does not guarantee better performance

The soreness evidence is real and modest in quality. The Cochrane review included 17 small trials with 366 participants. Fourteen compared cold water with passive rest, and the timepoint-specific pools favored cold water for soreness at 24, 48, 72 and 96 hours. Study quality was low, and few trials actively monitored adverse effects.¹

A newer umbrella review from Liang and colleagues, published on October 23, 2026, pulled together 14 systematic reviews from six databases searched through January 30, 2026. Soreness was the most consistently favorable outcome. The authors found it uncertain how much those soreness reductions matter to athletes in practice. Objective performance results, such as jumps, sprints and strength tests, were mixed and depended on when performance was measured and what cold water was compared against.²

The review has limits a reader should know before quoting it. Twelve of the 14 reviews were rated critically low quality on AMSTAR 2, and the other two were rated low. Overlap was high. Of 165 primary-study families, 99 appeared in two or more reviews, so the 14 reviews largely reanalyze the same trials and should not be counted as 14 independent replications. The authors did not pool a second-order estimate because the review-level estimates depend on each other. Long-term training adaptation was outside the review's scope, so it says nothing about muscle growth.²

A 2022 meta-analysis by Moore and colleagues compared cold water with passive recovery after a single hard session. At 24 hours after high-intensity exercise, cold water favored muscular power by a standardized mean difference of 0.22, with a 95 percent confidence interval from 0.004 to 0.43, and perceived recovery by 0.66, with an interval from 0.29 to 1.03.¹¹ These results add useful detail to the mixed performance findings across different tests and recovery conditions.

Broatch and colleagues tested expectation directly in 2014. Thirty men did four 30-second sprints, then spent 15 minutes in 10.3 degrees C water, sat in 34.7 degrees C water presented as a recovery treatment, or sat in the same thermoneutral water without the recovery claim. Over 48 hours, the cold and placebo groups recovered similarly, and both did better than the control group on strength and several self-reported measures.³ The result makes expectation a plausible contributor in that protocol. The trial does not show that every effect of cold is placebo, and it did not test whether a warm shower would do the same job.

Track what you lift, sprint or run in the next session alongside how sore you feel. The two can move separately. When a readiness score, your legs and your actual output disagree, the recovery nutrition guide for low readiness days covers what to check before blaming recovery.

03Repeated post-lift cooling may reduce muscle growth

The growth evidence comes from a handful of older trials, and they point in the same direction with wide uncertainty. Roberts and colleagues published the best-known one in 2015. Twenty-one physically active men trained twice a week for 12 weeks. After each session, one group spent 10 minutes in 10 degrees C water and the other did 10 minutes of low-intensity cycling. The cycling group gained more muscle mass and strength. A separate acute experiment in 9 men found lower anabolic signaling and satellite cell activity in muscle biopsies after cooling.⁶ The comparison was active cycling, not sitting still, and the biopsy work suggests a mechanism without proving that reduced inflammation explains the 12-week result.

Fyfe and colleagues tested a whole-body program in 2019. Sixteen men trained three times a week for 7 weeks and spent 15 minutes after each session either in 10 degrees C water or resting passively at 23 degrees C. Cold water attenuated type II muscle fiber growth. Maximal strength gains were similar between groups.⁵ Size and strength need separate answers, and this trial is the reason.

Piñero and colleagues pooled 8 studies in a 2024 meta-analysis. Participants were mostly young men, one study included women, the ways of measuring muscle size varied, and study quality ranged from fair to poor. The comparative standardized mean difference for hypertrophy was −0.22, with a 95 percent credible interval from −0.47 to 0.04.⁴ The most likely result is a small reduction in growth, and the interval still includes no difference. A standardized effect like this cannot be turned into a percentage of muscle any one person would lose.

Fuchs and colleagues looked at protein use directly. Twelve young men trained, then cooled one leg in 8 degrees C water and the other in 30 degrees C water for 20 minutes, then drank 20 grams of labeled milk protein with 45 grams of carbohydrate. The cooled leg incorporated less of that protein into muscle and showed lower muscle protein synthesis acutely and across two weeks of repeated training and cooling.⁷ This is short-term mechanistic evidence. The study did not measure muscle growth or show that the protein was wasted.

If muscle size is the main goal of your block, repeated cold immersion right after lifting has the clearest evidence against it. The build muscle goal depends on stacking weeks of training and muscle protein synthesis, and cold right after each lift may reduce that response.

04Timing your plunge around lifting

The common advice is to wait 4 hours, or 6, or until the next day. In the Piñero meta-analysis, the included protocols applied cold within 15 minutes of finishing the session, and no study in this evidence base compared a plunge several hours after lifting with no plunge for muscle growth.⁴ Waiting may lessen the effect, but no trial has measured whether or by how much.

The same gap covers rest days, cuts and deloads. A rest-day plunge is further from the last lift, and its effect on growth has not been tested. During a cut, keeping muscle is the main goal, and no trial shows cold carries less risk then. The effects of occasional use also remain uncertain because the growth evidence mainly concerns repeated post-session cooling.

Cold showers sit outside this evidence. None of the trials discussed here used them, so a shower's effect on soreness or growth is unknown in both directions.

Protein does not settle the question either. In the Fuchs study, participants drank protein after cooling, and the cooled leg still incorporated less of it.⁷ That study did not test whether a larger dose or different timing would close that gap. Eat your normal post-lift meal because training needs it, without counting on it to offset a plunge.

If you want to keep plunging during a muscle-gain block, a practical option is to move it later in the day or to a rest day. Any specific delay you choose is a personal rule.

05Refuel before adding recovery rituals

After a hard session, the things with direct recovery evidence are carbohydrate to refill glycogen, fluid and sodium to replace sweat losses, protein for muscle repair, and sleep. A plunge supplies none of them. If time in the tub pushes dinner or bedtime later, it competes with priorities for the next hard session.

In a muscle-gain block, the post-lift meal and the next few feedings carry more weight than any recovery gadget. The peri-workout nutrition guide for hypertrophy covers what to eat before, during and after lifting, and the leucine threshold guide covers protein per meal. When the next demanding session is less than a day away, fueling two hard days in a row sets out the carbohydrate, fluid and sleep targets for the gap.

Some people plunge to burn fat. Much of the human brown-fat research uses long, mild cold exposure. In one 2013 study, 12 young men with low or undetectable brown-fat activity spent 2 hours a day at 17 degrees C for 6 weeks.⁸ Their fat mass fell by an average of 0.70 kilograms, while 10 men who kept their usual routines had a mean change of plus 0.03 kilograms, which was not significant.⁸ A few minutes in a tub is a different stimulus, and its value for fat loss has not been established. The energy deficit, protein intake and resistance training covered in the get leaner and stronger goal do the work.

If a plunge would cost you a meal, push your bedtime later or eat into the window before a morning session, skip it.

06Choose cold by the demands of your week

Three situations show how the decision changes. In a muscle-gain block, growth over months is the outcome, and repeated cold right after lifting is the pattern with evidence of a possible growth cost. In a short-turnaround tournament, you need to play again within hours or the next morning, and less soreness may be worth having if you have tolerated cold before. On a rest day, the plunge is a preference, and its effect on growth is untested.

When growth is the priority, skip routine post-lift cooling. Between matches, cold immersion is optional and should be rehearsed, with no guarantee of better performance. Rest-day use is personal preference, with effects on growth unknown.²⁴

Rehearse any cold routine in training before you use it at a competition. Keep a short record for each trial day.

1. The session you did and the cold exposure, including water temperature and minutes.
2. Food and fluid in the hours after the session.
3. Sleep that night.
4. Soreness the next morning.
5. Actual performance in the next session, such as a top set, a sprint time or a run split.
6. Adverse symptoms, such as dizziness, numbness or trouble catching your breath.

A few weeks of notes show what you tolerate and what you prefer. They cannot show that cold caused a good or bad session, because food, sleep and the training itself change at the same time.

Sudden immersion in cold water triggers cold water shock, a gasp and rapid breathing with sharp rises in heart rate and blood pressure.⁹ An American Heart Association News explainer cautions people with a cardiac history about cold immersion and advises never swimming in cold water alone. Talk with your clinician before trying it if you have a heart condition.¹⁰ Keep someone nearby, and get out if breathing does not settle.

If muscle growth is the priority, skip routine post-lift plunges. During a congested competition schedule, consider rehearsed cold immersion for soreness relief, better perceived recovery and a possible small improvement in next-day power recovery, while keeping food, fluids and sleep first.