To do contrast therapy at home, spend 10 to 15 minutes in a sauna, then 1 to 3 minutes in a cold plunge, rest for a few minutes, and repeat for two or three rounds. Beginners should start with a warmer plunge, around 12 to 15°C, and fewer rounds. The research on contrast therapy is limited, so treat it as a routine you enjoy rather than a guaranteed fix.
This guide covers the common ways people structure a sauna and cold plunge session, how many rounds to do, whether to finish hot or cold, and how to stay safe. For the wider picture, see our contrast therapy guide.
What contrast therapy actually is
Contrast therapy simply means alternating between heat and cold. In a home setting that usually means a sauna followed by a cold plunge, though some people use a hot shower or warm bath instead of a sauna. The idea is old and common across Nordic and Eastern European bathing cultures, where a hot room is followed by a cold dip, a cold shower or time outside.
What the research says (honestly)
Most of the controlled research on contrast therapy looks at water to water protocols after exercise, not sauna to plunge routines. A 2013 systematic review and meta-analysis in PLOS ONE by Bieuzen, Bleakley and Costello pooled 18 small studies. It found contrast water therapy was associated with less muscle soreness and less strength loss after exercise than passive rest, but no clear advantage over cold water immersion alone, active recovery or stretching. The authors rated the overall quality of evidence as low and said the findings were not definitive.
The protocols in those studies typically used cold water of about 8 to 15°C for around 1 minute, warm water of about 35 to 45°C for 1 to 3 minutes, and 3 to 7 alternations. That is a useful reference point, but it is not the same as a 65°C infrared sauna followed by a plunge.
A small 2021 study in Cell Reports Medicine compared eight young Scandinavian men who regularly alternated winter swimming and sauna with eight men who did neither. The swimmers responded differently to cold, but the researchers noted the small sample, the absence of women, and that the study cannot show cause and effect.
In short: many people find contrast therapy refreshing and relaxing, and short term recovery findings are encouraging but weak. If your main goal is building muscle, read should you cold plunge after strength training before making plunges part of every gym day.
A simple contrast therapy routine
There is no single proven protocol. The routine below is a sensible, conservative starting point for healthy adults.
- Warm up in the sauna. 10 to 15 minutes. In an infrared sauna you might set 50 to 60°C to begin. Get out sooner if you feel dizzy or unwell.
- Cool down briefly. Take a minute to stand, rinse off sweat and let your breathing settle before the cold.
- Cold plunge. 1 to 3 minutes. Lower yourself in slowly, focus on long, controlled breaths, and keep your head above water.
- Rest. 3 to 5 minutes sitting or standing at room temperature, wrapped in a towel.
- Repeat. Two or three rounds is plenty for most people.
| Level | Sauna | Plunge temperature | Plunge time | Rounds |
|---|---|---|---|---|
| First sessions | 10 minutes | 12 to 15°C | 30 to 60 seconds | 1 to 2 |
| Comfortable | 12 to 15 minutes | 8 to 12°C | 1 to 2 minutes | 2 to 3 |
| Experienced | 15 minutes | 5 to 10°C | 2 to 3 minutes | 3 |
These are practical ranges, not targets. Colder and longer is not automatically better. For more detail on the cold side, see our beginner guide to taking an ice bath.
Which order: sauna first or plunge first?
Most people start in the sauna. Being warm makes the cold easier to face, and it mirrors traditional bathing. Starting with the cold is not wrong, but going into a sauna already chilled is less pleasant and gives you nothing obvious in return.
Should you end on cold or warm?
There is no strong evidence either way, so choose based on how you feel and what comes next.
- Ending on cold is popular, and the studies in the 2013 review commonly finished with cold water. Many people like the alert, fresh feeling. Your body then rewarms on its own, so allow time to dry off, dress warmly and move gently.
- Ending on warm can suit evenings or anyone who struggles to warm up afterwards. A short final sauna round or a warm shower brings you back to comfort faster.
Whichever you choose, do not jump straight into a hot shower after a long, very cold plunge if you feel lightheaded. Sit down, dry off and warm up gradually.
Setting up at home
Keep the sauna and plunge close together so you are not walking through a cold garden in wet feet. Have towels, a robe, sliders and a drink within reach. A water thermometer or app control helps you keep the plunge at a consistent temperature, which makes progress easier to judge. Our home recovery space ideas cover layout, flooring and ventilation in more detail.
If you are building a setup from scratch, the ThermoX OG Sauna is a two person infrared cabin that runs from a standard UK 13A socket, and the ThermoX Elite is an all-in-one cold plunge with an integrated chiller that can hold water as low as 3°C.
Safety first
Heat and cold both put real demands on your heart and circulation. The British Heart Foundation notes that cold water makes the heart work harder and can raise heart rate and blood pressure. The RNLI describes cold water shock, a sudden gasp and rapid breathing on entry, as often underestimated and a risk in any water below 15°C.
- Speak to your GP first if you have a heart condition, high or low blood pressure, are pregnant, or have any other medical condition.
- Never plunge or use a sauna after drinking alcohol, and do not plunge alone.
- Start warmer and shorter, and build up over weeks.
- Get out of the sauna if you notice signs the NHS links with heat exhaustion, such as dizziness, headache, feeling sick or excessive sweating.
- Drink water before and after your session.
Frequently asked questions
How many rounds of sauna and cold plunge should I do?
Two or three rounds is a sensible range for most healthy adults. Beginners can start with one or two rounds and add more only once the routine feels comfortable.
How long should I stay in the cold plunge after a sauna?
Around 1 to 3 minutes is a common range. Start with 30 to 60 seconds at a milder temperature and build up gradually.
Is it better to end contrast therapy on cold or warm?
There is no strong evidence either way. Ending on cold is common and feels refreshing, while ending on warm can suit evenings or anyone who finds it hard to rewarm.
Is contrast therapy proven to help recovery?
No. A 2013 meta-analysis in PLOS ONE found contrast water therapy was linked with less soreness than passive rest after exercise, but the evidence was low quality and it was not clearly better than other recovery methods.