Contrast therapy involves alternating periods of hot and cold water immersion, typically cycling 3 to 5 times between hot water at 38 to 42 degrees Celsius and cold water at 10 to 15 degrees Celsius, with each period lasting 1 to 4 minutes. The physiological rationale is straightforward: heat causes vasodilation, increasing blood flow to peripheral tissues. Cold causes vasoconstriction, forcing blood centrally. Alternating between the two creates a pump-like effect on the peripheral circulation that accelerates metabolite clearance, reduces local oedema, and reduces inflammatory mediator accumulation in exercised tissue.
The Evidence Compared to Cold Alone
A systematic review comparing contrast therapy to cold water immersion alone found that both were superior to passive recovery for reducing delayed onset muscle soreness and restoring functional performance. Contrast therapy was comparable to cold water immersion for most outcome measures. Some evidence suggests contrast therapy may be superior for power and strength recovery compared to cold alone, potentially because the vasodilatory phase promotes nutrient delivery and metabolite clearance more effectively than sustained vasoconstriction.
A Practical Protocol
- Begin with 3 minutes of hot water exposure at 38 to 40 degrees
- Transition to 1 minute of cold water at 10 to 15 degrees
- Repeat the cycle 3 to 5 times
- End with cold to maximise the anti-inflammatory effect
- Allow 10 to 15 minutes for body temperature to normalise before eating
- Most effective within 60 minutes of exercise; effects diminish beyond 2 to 3 hours post-exercise
Sources
- Versey, N.G., et al. (2013). Water immersion recovery for athletes: effect on exercise performance and practical recommendations. Sports Medicine, 43(11), 1101-1130.
- Bieuzen, F., et al. (2013). Contrast water therapy and exercise induced muscle damage: a systematic review and meta-analysis. PLOS ONE, 8(4), e62356.
- Higgins, T., et al. (2011). Peers and physiological responses to contrast water immersion. International Journal of Sports Physiology and Performance, 6(3), 392-403.