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Glossary
Contrast therapy
Contrast therapy is the deliberate switch between heat and cold, such as a sauna followed by an ice bath, repeated over several rounds.
Also: hot cold therapy, sauna and ice bath, contrast bath, hot and cold plunge
Updated
An old practice with a new name
Switching between hot and cold is part of many bathing cultures: the Finnish sauna and a jump in the lake, the Roman caldarium and frigidarium, the hot and cold affusions of Sebastian Kneipp in 19th-century Germany. “Contrast therapy” is today’s umbrella term for all of them.
A typical session
One round is a heat phase followed by a short cold phase. Two to three rounds are common. Whether you finish warm or cold is a matter of habit: Nordic tradition often ends on cold.
| Phase | Example | Time |
|---|---|---|
| Heat | Infrared sauna (45–65 °C) or traditional sauna (80–100 °C) | 10–20 minutes |
| Transition | A moment in the open air, calm breathing | 1–2 minutes |
| Cold | Ice bath or cold plunge (3–15 °C), cold shower | 1–3 minutes |
| Rest | Dry off, sit, drink | 5–10 minutes |
If you have a heart or circulation condition or high blood pressure, are pregnant, or take medication that affects temperature regulation, ask a doctor first. Stop at once if you feel unwell.
Contrast therapy at home
At home you need a heat source and a cold source close together. The Helsi™ One Sauna Dome runs on a normal power point and warms up in 15 to 20 minutes; the Helsi™ Ice Plunge keeps the water cold with its own chiller. Together they make a contrast routine without leaving the house.
More at Helsi™
Related terms
- Cold plunge vs. ice bathA cold plunge is a short dip in cold water of about 3 to 15 °C, usually in a tub with its own chiller that holds the temperature; an ice bath is the older version, cooled with bagged ice.
- Infrared vs. traditional saunaA traditional (Finnish) sauna heats the air to 80 to 100 °C, while an infrared sauna warms the body with infrared radiation at an air temperature of about 45 to 65 °C.
- Ice bath chillerAn ice bath chiller is a cooling unit that chills water with a refrigeration cycle of compressor, refrigerant and heat exchanger, keeping an ice bath at a set temperature without bagged ice.
This entry explains a term in technical terms. It makes no claim about health effects and is not medical advice. Helsi™ products are not medical devices.