What is contrast therapy?

How it works

In heat, blood vessels near the skin open and blood flow to the muscles rises. In cold, they clamp down and blood moves to the core. Going from one to the other creates a push and pull that many people feel as lighter, looser limbs afterward.

The second effect is in the nervous system. Heat relaxes; cold sharpens. Doing both in one visit leaves you relaxed and alert at the same time, which is an unusual and very pleasant state.

What people use it for

• Sore muscles after training, a game or a long shift
• Stiff backs, hips and shoulders
• Mild swelling in the legs
• Low energy and foggy afternoons
• Stress, and the wired-but-tired feeling

What the research says, honestly

Studies on contrast water therapy show modest benefits for perceived soreness and recovery after hard exercise, roughly on par with cold immersion alone. Effects on performance are small. Most people do it because of how they feel afterward, which is the point.

Contrast therapy vs cold plunge alone

Cold alone gives you the alertness and the anti-soreness effect. Adding heat first makes the cold easier to enter, loosens tight muscles beforehand and adds the sauna's own benefits: a deep sweat and real relaxation. If you only have time for one, pick the plunge. If you have 50 minutes, do both.

How to do it

1. 1

   Heat first: 20 to 30 minutes in the infrared sauna.

2. 2

   A quick shower, so the plunge water stays clean.

3. 3

   Then cold: 2 to 4 minutes in 41°F water with steady breathing.

4. 4

   Rewarm naturally for 10 minutes. The plunge is your finish.