Contrast therapy: what the evidence says

Last verified November 2, 2026. Every grade and protocol on this page links to the study it comes from. Where we couldn't confirm something, we say so.

How we make money: MoveWell may earn a commission if you buy through links on our product pages, at no extra cost to you. This guide has no affiliate links. We have not run any contrast therapy trials ourselves; everything here comes from published research.

The short answer

Contrast therapy means switching between hot and cold, usually water. Across 13 pooled studies it reduced soreness and strength loss compared with resting, but it wasn't clearly better than cold water alone or other common recovery methods¹. The studies mostly used 1-minute switches between about 38 °C and 15 °C water for around 14 minutes²³, not a sauna and an ice bath. If you lift to build muscle, keep the cold part away from the end of your strength sessions⁴. If you have a heart condition, high blood pressure or Raynaud's, talk to your doctor first⁵⁶.

What contrast therapy is

Sports science reviews define cold-water immersion as water at or below 20 °C, hot-water immersion as 36 °C or above, and contrast water therapy as alternating between the two³. Two very different things now go by the name:

• Water to water (what the studies tested): a hot tub or bath at about 38 °C and a cold tub at about 10 to 15 °C, with short bouts in each.
• Sauna to cold plunge (what most people now do): several minutes in a sauna (Finnish saunas average about 80 °C⁷), then a cold plunge. We found no recovery trials of this format. It may still be pleasant and safe for healthy people, but the soreness data below don't directly apply to it.

Evidence map

Grades: A consistent randomized trials or meta-analyses. B supported by meta-analyses or randomized trials that are small or varied. C few or mixed trials. D no good evidence (untested, lab-only, or no effect found). X a signal it works against you.

Outcome	Grade	Best evidence	What the studies used
Muscle soreness	B	Meta-analysis of 18 trials: across 13 studies, contrast water therapy improved soreness more than passive recovery at every time point from under 6 hours to 96 hours. All trials were at high risk of bias1.	Hot and cold water, mostly short bouts of about 1 minute
Strength and power recovery	B	Less strength loss than passive recovery in the same meta-analysis1. In a trial of 38 strength-trained men, contrast therapy improved squat jump and isometric force recovery at 24, 48 and 72 hours2.	7 rounds of 1 minute at 15 °C and 1 minute at 38 °C, 14 minutes in total
Compared with cold water alone	C	Little evidence of a difference between contrast therapy and cold water immersion, warm water, compression, active recovery or stretching1.	Various
Next-day endurance and sprint	C	In a conference abstract, 12 cyclists did better over 5 days of hard sessions with contrast or cold water than with hot water or rest8.	38 °C and 15 °C, 14 minutes
General feeling of recovery	C	Mixed. In the largest recovery meta-analysis, contrast water therapy reduced soreness slightly but had no effect on perceived fatigue9. In a crossover trial of 10 elite netballers, contrast baths and contrast showers both improved perceived recovery compared with rest, but not repeated agility14.	Various
Muscle growth after lifting	Xcold part	Not tested for contrast therapy. Cold-water immersion right after strength training reduced muscle growth in a meta-analysis of 8 studies4 and a 12-week trial10.	Cold water only: 10 °C for 10 minutes after each session in the 12-week trial
Sleep	D	A review of athlete sleep interventions found cold water immersion had no effect on sleep, from few studies11. We found no contrast therapy sleep trials.	n/a
Injury healing	D	We found no good trials of contrast therapy for healing sports injuries.	n/a
Long-term health	D	No contrast therapy trials. Sauna on its own is linked to lower cardiovascular and all-cause mortality in Finnish men, in observational data only7. Regular cold water had short-lived effects on stress and quality of life in a 2025 meta-analysis12.	n/a

Protocols used in studies

These are the protocols researchers used, not a prescription. We list them so you can see what the evidence above is based on.

Study	Hot	Cold	Switching	Total time	Who
Vaile 2008, DOMS trial2	38 °C water, body below the neck	15 °C water, body below the neck	7 rounds of 1 minute each, under 5 seconds to switch	14 minutes, right after exercise and then daily for 3 days	38 strength-trained men
Vaile 2008, cycling abstract8	38 °C	15 °C	Not stated in the summary	14 minutes after each daily session	12 endurance cyclists
Versey 2013 review3	36 °C or above	20 °C or below	Equal hot and cold time (1:1), bouts of about 1 minute	Up to about 15 minutes	Summary of trials in athletes

For comparison, the same review found cold water alone worked best at 10 to 15 °C for 5 to 15 minutes³. A later meta-analysis found shorter, colder immersions did best after high-intensity exercise¹³. The review also concluded that a bigger contrast dose is unlikely to work better³.

Hot first or cold first? End on cold?

We found no trial that compared the order or the final bath. Even the Vaile paper lists the order differently in its methods and discussion². "Always end on cold" is a popular rule, not a tested one. Choose the ending that suits what comes next: ending warm is more comfortable before bed or a drive; ending cold may feel more alert.

Timing relative to training

• After hard conditioning, matches or races: this is where the evidence sits. The trials applied contrast therapy within minutes of exercise and, in one, again each day for three days².
• When you train again soon: for cold water, the review found that the time between immersion and the next session affects the result³. Tournaments and two-a-days are where short-term recovery matters most.
• After strength training aimed at muscle growth: avoid regular cold immersion straight afterwards⁴¹⁰. We found no trial that tested a contrast protocol after lifting, or how long to wait, so separating them by several hours or using rest days is a reasonable but untested workaround.
• Before training: we found no good trials of contrast therapy as a warm-up.

Safety: who should avoid it or ask first

Sudden cold triggers the cold shock response: gasping, fast breathing, a jump in blood pressure and sometimes abnormal heart rhythms. It is strongest in the first 30 seconds and peaks in water around 10 to 15 °C⁵. Heat puts its own load on the heart and circulation, which is why some heart conditions rule out sauna use⁶. Switching between the two stacks both stresses.

Talk to your doctor first if you have

• High blood pressure, heart rhythm problems, structural or coronary heart disease, or a family history of sudden cardiac death. Cold water researchers list all of these as conditions to screen for⁵.
• Unstable angina, a recent heart attack or severe aortic stenosis: these are listed as reasons not to use a sauna, and heart failure and arrhythmia as reasons for caution⁶.
• Raynaud's phenomenon or other circulation problems in the hands and feet, and cold urticaria (hives from cold)⁵. Cold can trigger attacks.
• Cold- or exercise-induced asthma, or medicines that can affect heart rhythm, including some antihistamines⁵.
• Pregnancy: sauna has been described as safe in uncomplicated pregnancies in women used to it, but not in high-risk pregnancies⁶. We found no contrast therapy data in pregnancy.
• A recent stroke or mini-stroke: avoid sauna until your condition is stable⁶.

Ground rules from the safety literature

• Don't drink alcohol before or during. Alcohol in the sauna is linked to low blood pressure, fainting, arrhythmias and death⁶, and to cold water deaths⁵.
• Get into cold water slowly. Don't put your face under or hold your breath, which raises arrhythmia risk⁵.
• Don't do it alone, and don't judge time by how cold you feel⁵. Use a timer.
• Warm up gradually afterwards and avoid driving for about 30 minutes after a long cold exposure, because your core keeps cooling⁵.
• Measure the water temperature with a thermometer. Feel is unreliable once you are used to cold.

Home setups

The closer your setup is to two tubs of water, the closer it is to what the studies tested.

Setup	Hot side	Cold side	How close to the studies	Where to start
Shower only	Hot shower	Cold shower	One small trial: 1-minute switches between 38 °C and 18 °C showers for 14 minutes improved how recovered 10 netballers felt, not their performance14	No purchase needed
Bath plus cold tub	Bathtub at about 38 °C	Cold tub or a second tub with ice	Closest to the trial protocols	Cold plunge picks, Ice Barrel review
Sauna plus cold plunge	Sauna (hot air, around 80 °C in a Finnish sauna)	Chilled plunge tub	Not tested for recovery; hot side is very different from 38 °C water	Infrared saunas, barrel saunas, outdoor saunas, cold plunges
Sauna blanket plus cold shower	Heated blanket	Cold shower	Not tested	Sauna blankets

Want to compare cold options first? See cryotherapy vs cold plunge. For the bigger picture, see recovery tools ranked by evidence.

Myths

• "Contrast therapy beats cold water alone." The meta-analysis found little difference between them¹.
• "More rounds and bigger temperature swings work better." A dose-response effect is unlikely, according to the main review³.
• "You must end on cold." We found no trial that tested the final bath.
• "The studies used a sauna and an ice bath." They mostly used two tubs of water at about 38 °C and 15 °C.
• "It's fine after every workout." Not if muscle growth is your goal: the cold part is the problem⁴.

FAQ

How long should contrast therapy last?

The main trials used about 14 minutes in total, switching every minute². A review suggests up to about 15 minutes, with equal hot and cold time³.

What temperatures did studies use?

Hot water around 38 °C and cold water around 15 °C². Reviews define cold as 20 °C or below and hot as 36 °C or above³.

Is a sauna and cold plunge the same as contrast therapy?

It's a version of it, but not the one that was tested. A sauna is much hotter than 38 °C water, and the sessions are usually longer.

Is contrast therapy better than an ice bath?

Not clearly. The pooled evidence shows similar results¹. Pick the one you'll actually do.

Can I do contrast therapy after lifting weights?

If you're trying to build muscle, avoid cold immersion right after lifting⁴. Do it on other days or after conditioning sessions instead.

Is contrast therapy safe with high blood pressure?

Ask your doctor first. High blood pressure is on the cold-water screening list⁵.

Does contrast therapy help you sleep?

We found no trials of contrast therapy for sleep, and cold water immersion showed no sleep effect in an athlete review¹¹.

References

Journal details were checked on the publisher page, a university repository or a database abstract on November 1 to 2, 2026. Where we could only read an abstract or a summary, the reference says so.

1. Bieuzen F, Bleakley CM, Costello JT. Contrast water therapy and exercise induced muscle damage: a systematic review and meta-analysis. PLoS ONE, 2013;8(4):e62356. doi:10.1371/journal.pone.0062356 Source
2. Vaile J, Halson S, Gill N, Dawson B. Effect of hydrotherapy on the signs and symptoms of delayed onset muscle soreness. European Journal of Applied Physiology, 2008;102:447-455. doi:10.1007/s00421-007-0605-6 Source
3. Versey NG, Halson SL, Dawson BT. Water immersion recovery for athletes: effect on exercise performance and practical recommendations. Sports Medicine, 2013;43(11):1101-1130. doi:10.1007/s40279-013-0063-8 Source
4. Piñero A, Burke R, Augustin F, et al. Throwing cold water on muscle growth: a systematic review with meta-analysis of the effects of post-exercise cold water immersion on resistance training-induced hypertrophy. European Journal of Sport Science, 2024;24(2):177-189. doi:10.1002/ejsc.12074 Source
5. Tipton M, Massey H, Mayhew A, Morgan P. Cold water therapies: minimising risks. British Journal of Sports Medicine, 2022;56(23):1332-1334. doi:10.1136/bjsports-2022-105953 (we read the University of Portsmouth author manuscript). Source
6. Hannuksela ML, Ellahham S. Benefits and risks of sauna bathing. American Journal of Medicine, 2001;110(2):118-126. Source
7. Laukkanen T, Khan H, Zaccardi F, Laukkanen JA. Association between sauna bathing and fatal cardiovascular and all-cause mortality events. JAMA Internal Medicine, 2015;175(4):542-548. doi:10.1001/jamainternmed.2014.8187 Source
8. Vaile J, Halson S, Gill N, Dawson B. Effect of hydrotherapy on the recovery of exercise-induced fatigue and performance. Conference abstract, ACSM 55th Annual Meeting, 2008 (summary page; not peer-reviewed full paper). Source
9. Dupuy O, Douzi W, Theurot D, Bosquet L, Dugué B. An evidence-based approach for choosing post-exercise recovery techniques to reduce markers of muscle damage, soreness, fatigue, and inflammation: a systematic review with meta-analysis. Frontiers in Physiology, 2018;9:403. doi:10.3389/fphys.2018.00403 Source
10. Roberts LA, Raastad T, Markworth JF, et al. Post-exercise cold water immersion attenuates acute anabolic signalling and long-term adaptations in muscle to strength training. Journal of Physiology, 2015;593(18):4285-4301. doi:10.1113/JP270570 Source
11. Cunha LA, Costa JA, Marques EA, Brito J, Lastella M, Figueiredo P. The impact of sleep interventions on athletic performance: a systematic review. Sports Medicine - Open, 2023;9:58. doi:10.1186/s40798-023-00599-z Source
12. Cain T, Brinsley J, Bennett H, Nelson M, Maher C, Singh B. Effects of cold-water immersion on health and wellbeing: a systematic review and meta-analysis. PLOS One, 2025. doi:10.1371/journal.pone.0317615 Source
13. Moore E, Fuller JT, Buckley JD, et al. Impact of cold-water immersion compared with passive recovery following a single bout of strenuous exercise on athletic performance in physically active participants: a systematic review with meta-analysis and meta-regression. Sports Medicine, 2022;52(7):1667-1688. doi:10.1007/s40279-022-01644-9 Source
14. Juliff LE, Halson SL, Bonetti DL, Versey NG, Driller MW, Peiffer JJ. Influence of contrast shower and water immersion on recovery in elite netballers. Journal of Strength and Conditioning Research, 2014;28(8):2353-2358. doi:10.1519/JSC.0000000000000417 Source