Understanding Contrast Therapy: A Beginner's Guide

13 October 2026

Cold plunge and steam room at The Mill, Buckinghamshire

Contrast therapy means moving deliberately between heat and cold, whether that is a sauna and plunge or a steam room and cool shower. The change produces real and immediate responses in the body, and may help reduce soreness after demanding exercise. Claims about wider health benefits are less certain, but many people value the ritual for how alert, relaxed or refreshed it leaves them feeling.

What is contrast therapy?

Contrast therapy is a broad term for deliberately exposing the body to heat and cold in succession, often more than once. In its most recognisable form, that might mean warming up in a sauna before entering a cold plunge. The same principle can be applied more gently with a steam room and cold shower, a hot tub and cool rinse, or by changing the water temperature during a shower.

Although the name can make it sound like a formal treatment, there is no single way to practise it. Temperatures, timings and the number of rounds vary considerably, and the dramatic sauna-to-ice-bath routines seen online are only one version. Someone trying contrast therapy for the first time can begin with a much less extreme change in temperature.

Athletes often turn to hot and cold after strenuous exercise in the hope of reducing soreness and feeling better recovered. Away from sport, people may be drawn to the relaxation of the heat, the alertness that often follows cold exposure or simply the ritual of moving between the two.

In my own case, I use a steam room before work whenever I can, and I always follow it with a cold shower. Those mornings generally start better: I feel more alert and ready to face the day. That may be a personal response rather than evidence of a particular health benefit, but it captures much of the everyday appeal: the response to changing temperature is immediate and unmistakable, even if some of the broader claims made for contrast therapy go considerably further than current evidence.

Why combine hot and cold?

Heat and cold feel very different on their own. Heat tends to loosen the body and encourage a sense of calm, while cold demands attention almost immediately. Putting the two together creates a more pronounced change in sensation than either would provide alone, and that is a large part of the appeal.

Cooling off has long been part of sauna bathing in Finland and other parts of Northern Europe. Traditionally, that might have meant stepping into cold outdoor air, swimming in water or even rolling in snow before returning to the sauna. The term “contrast therapy” now covers these customs as well as more recent routines developed specifically for exercise recovery, so people may be doing something similar for quite different reasons.

Today, it might be used to ease out of a stressful day, provide a bracing start to the morning or follow a demanding training session. The immediate change in how you feel is easy to recognise. Whether that sensation is accompanied by a lasting health or recovery benefit is harder to establish, and that is where the research becomes important.

What happens to your body?

Your body is constantly working to keep its core temperature within a fairly narrow range. Heat and cold present it with opposite problems, and during contrast therapy it has to adjust repeatedly as you move from one to the other.

As you become hot, blood vessels near the skin widen and more blood is directed towards the surface, where heat can escape. Heart rate usually rises and, in a sauna or steam room, sweating provides another means of cooling down. Warmth can also make stiff or tired muscles feel looser, although the experience will vary with the type and intensity of the heat.

Cold exposure changes those priorities rather quickly. Blood vessels near the skin narrow to reduce heat loss, while heart rate and blood pressure can rise. The response depends partly on how the cold is applied, with full immersion generally creating a more sudden and intense challenge than cold air or a cool shower. If the water is sufficiently cold, sudden immersion may also cause an involuntary gasp followed by rapid breathing.

During contrast therapy, however, that cold phase does not begin from the body’s normal resting state. You may enter it with warm skin, widened blood vessels and an elevated heart rate, while your body is still trying to release heat. The greater temperature difference can cool the skin quickly, and the body has to reverse much of what it was doing only moments before.

The same applies when you return to the heat. Your skin and peripheral tissues may still be cool, while blood vessels near the surface remain narrowed to conserve warmth. Each phase therefore alters the conditions in which the next one begins. The sensation can be dramatic, although most of the immediate change occurs at the skin and in the peripheral circulation rather than the core temperature swinging rapidly between extremes.

This repeated widening and narrowing of blood vessels is often described as a circulatory “pumping” effect. The description reflects a real response to changing temperature, but it is sometimes taken further and credited with improving circulation or removing waste products from the muscles. Researchers have not yet established whether that pumping action is responsible for any improvement in recovery.

What are the possible benefits?

Most of the research into contrast therapy concerns recovery after demanding exercise. The clearest finding is that cold-water immersion can reduce delayed-onset muscle soreness compared with simply resting. Contrast water therapy has also performed better than passive recovery in some studies, particularly when participants were asked how sore they felt over the following few days.

Comparisons with other recovery methods are less conclusive. Alternating hot and cold has not consistently outperformed cold-water immersion, warm-water immersion or active recovery, and the studies have used a wide variety of temperatures, timings and numbers of rounds. Many have also involved relatively few participants.

It helps to be clear about what researchers mean by recovery. Feeling less sore can be useful, particularly for an athlete who needs to compete or train again soon. It does not necessarily mean that muscle tissue has repaired more quickly or that physical performance will improve at the same rate.

A large review published in 2024 illustrates the difficulty. It compared cold, hot, contrast and temperature-neutral water immersion, along with whole-body cryotherapy, following strenuous exercise. Different approaches performed better for different measurements and at different points during the following 48 hours. Contrast water therapy produced encouraging results for some biochemical markers, while other methods performed better for soreness or neuromuscular recovery.

There is evidence that contrast therapy can help people feel less sore after exercise. Claims that it repairs muscles more quickly, removes toxins or provides the best form of recovery go beyond what the research currently shows.

What about mood, alertness and general wellbeing?

Cold activates the sympathetic nervous system and causes the release of catecholamines, a group of chemical messengers involved in the body’s response to stress. This provides a credible physiological explanation for the alertness people often report after a cold shower or plunge.

Neuroscientist Andrew Huberman describes the immediate effect neatly:

“The key point is that your mental state is shifted when you are exposed to certain forms of cold.”

One frequently quoted experiment found substantial increases in plasma noradrenaline and dopamine when healthy young men were immersed up to the neck in 14°C water. The figures often repeated online are 530 per cent for noradrenaline and 250 per cent for dopamine.

The detail that tends to receive less attention is that the immersion lasted for an hour. The researchers measured chemicals circulating in the blood rather than dopamine activity in the brain, and they did not test whether the participants became happier, more focused or more motivated. It is useful evidence that cold can produce a considerable neurochemical response, but it cannot tell us what a two-minute cold shower will do to someone’s mood.

The heat phase brings a different quality to the experience. A sauna, steam room, hot tub or warm bath provides time away from other demands, and warmth itself can feel physically relaxing. Concentrating on your breathing during the cold phase can make the whole routine absorbing enough to interrupt the usual flow of thoughts.

Those effects may come from several things working together: the temperature, the surroundings, expectation and the decision to set the time aside. Research into the wider mental health effects of contrast therapy remains limited, so feeling calmer or more alert after a session should not be confused with evidence that it can treat anxiety, depression or another health condition.

Do you need a sauna and an ice bath?

A sauna and purpose-built cold plunge make it convenient to move between temperatures, but neither is essential when you are finding out whether the experience suits you. A warm bath followed by a cool shower will create a noticeable contrast.

You can also alternate between warm and cool water during a shower, sometimes known as a contrast shower or Scottish shower. Traditionally, this involves changing temperature more than once rather than merely finishing an ordinary warm shower with a brief cold rinse. The terminology varies, and there is no official sequence that must be followed.

A hot tub can provide the heat phase, although it affects the body differently from a sauna. In a sauna, the body is surrounded by hot air and cools itself partly through sweating. In a hot tub, much of the body is immersed in water, which transfers heat efficiently and also exerts pressure on the body. Temperatures and timings intended for a sauna should not simply be copied across to a hot tub.

There is similar variety at the cold end. A shower is easy to control and stop, which makes it a sensible starting point for many beginners. A cold plunge provides a more intense and consistent experience. Natural water brings additional considerations such as currents, depth, poor footing and the difficulty of getting out, particularly once the cold has begun to affect movement. A winter lake should not be treated as a larger version of a purpose-built plunge.

How to try contrast therapy for the first time

There is no scientifically established beginner’s formula. Research has used a wide range of temperatures and timings, and tolerance differs greatly between individuals. A first session is an opportunity to experience the change in temperature, not a test of how much discomfort you can withstand.

A straightforward way to begin is:

Start with a familiar form of heat, such as a warm shower, bath, hot tub or sauna. Use it at its usual recommended temperature rather than making it hotter for the sake of creating a greater contrast.
Leave the heat before you feel light-headed, excessively tired or uncomfortable. When getting out of a hot tub, pause long enough to make sure you feel steady before moving on.
Use a cool shower for the first cold phase rather than going directly into an ice bath. Lower the temperature gradually and concentrate on keeping your breathing controlled. The water only needs to feel distinctly cooler than the heat phase.
Return to the warmth if you would like another round. One or two changes are enough for a first attempt.

You may decide to use colder water or remain in it slightly longer as the experience becomes more familiar. Any progression should be gradual. Shivering, numbness, dizziness, confusion, chest discomfort or difficulty controlling your breathing are reasons to stop.

Should you finish hot or cold?

Whether you finish hot or cold depends largely on what you want from the session and how your body responds. Cold tends to feel more alerting, which may suit a morning routine or the end of a post-exercise session. Returning to warmth may feel more comfortable and relaxing.

Time of day is worth considering. An intense cold plunge immediately before bed will not feel restful for everyone, while remaining in strong heat for too long can leave you light-headed or overheated. There is no requirement for every contrast session to end in the same way.

If you finish cold, get dry, dress warmly and allow your body to warm gradually somewhere sheltered. Staying cold for longer does not make the session more effective.

A note for strength training

Cold-water immersion is popular with athletes who need to feel ready for another event or training session within a short time. If immediate soreness is the priority, that can make practical sense.

The calculation may be different for someone trying to maximise the long-term results of resistance training. A 2024 systematic review found evidence that regularly using cold-water immersion within 15 minutes of resistance exercise may modestly reduce gains in muscle size. The researchers also noted that the available studies were generally of fair to poor quality and mainly involved young men, which limits how broadly the finding can be applied.

An occasional cold shower is unlikely to undo the benefits of a workout. Someone training specifically for muscle growth may nevertheless prefer not to make immediate, prolonged cold-water immersion part of every strength session. It may be better reserved for occasions when rapid recovery matters more than maximising adaptation from that particular workout.

Risks and precautions

Cold-water immersion requires particular care because the body’s initial response can be sudden. The RNLI defines water at 15°C and below as cold water and warns that entering it may trigger cold-water shock. This can cause an involuntary gasp, rapid breathing, an increased heart rate and higher blood pressure before the body’s core temperature has begun to fall.

Moving directly from substantial heat into very cold water makes the change especially abrupt. Enter gradually, remain somewhere you can get out easily and do not regard an inability to control your breathing as a stage to be pushed through. Cold air or a controllable shower provides a gentler alternative for a beginner.

Anyone with a heart or circulatory condition, problems with blood pressure, a history of fainting or an adverse reaction to cold should seek medical advice before trying deliberate cold-water immersion. The same applies during pregnancy or when a condition such as Raynaud’s, cold urticaria or reduced sensation could affect the response to temperature. If you are uncertain about a medical condition or medication, ask an appropriate healthcare professional.

Alcohol and recreational drugs should not be combined with contrast therapy. Moving between heat and cold requires clear judgement, steady movement and the ability to recognise when something is wrong. Drink water around the session and leave the heat if you begin to feel unwell.

Natural cold water requires further precautions. Check the location and conditions, use suitable equipment, make sure you can enter and leave safely, and never swim alone. If you enter open water unexpectedly, the RNLI advises floating on your back until the initial cold-water response settles before attempting to swim.

Is contrast therapy worth trying?

For a healthy person who is curious about contrast therapy, it can be worth exploring without taking it to extremes. You may enjoy the change in sensation, feel more alert afterwards or find that it helps with soreness following strenuous exercise. You may equally decide that you prefer the warmth on its own.

The evidence is most useful when it keeps expectations realistic. Heat and cold produce clear physical responses, while cold-water immersion and contrast water therapy may reduce perceived soreness after exercise. The much broader claims made for detoxification, long-term mental health and superior recovery are not supported to the same degree.

Begin with temperatures you already know you can tolerate and make the contrast manageable. The aim is to find out how the experience feels and whether it adds anything useful to your routine. It need not be punishing, and it does not have to promise a dramatic change to earn its place.

Sources and further reading

Written by

Chris Hands

Updated: 13/10/2026

Knowledgebase

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