Contrast Therapy (Hot/Cold)

Contrast water therapy (CWT) alternates immersion in hot and cold water in repeated cycles (a common protocol is several rounds of ~1–4 min hot then ~1 min cold). The proposed mechanism is a "vascular pump" from alternating vasodilation and vasoconstriction. The evidence:

• ↓ Perceived soreness/fatigue: contrast therapy reduces DOMS and perceived fatigue, with effects broadly similar to cold-water immersion alone (see muscle-soreness, cold-water-immersion).
• Not clearly better than CWI or heat used individually; the "pump" mechanism is plausible but the added benefit over a single temperature is small/uncertain.
• Adaptation note: because contrast includes a cold phase, the same caution about routine post-lift cold blunting hypertrophy may partly apply — though the hot phase and shorter cold exposure may soften this.

Practical take: contrast is a reasonable option if an athlete finds it pleasant or has easy access to hot/cold facilities. It's a perception/comfort tool in the recovery-modalities tier, not a meaningful upgrade over cold or heat alone.

• Alternates hot and cold in cycles ("vascular pump").
• ↓ perceived soreness similar to CWI alone.
• Not clearly superior to single-temperature methods.
• Cold-phase adaptation caution may partly apply post-lift.

• cold-water-immersion — the cold component and its trade-off.
• heat-sauna — the hot component.
• muscle-soreness — DOMS target.
• recovery-modalities — its place in the tier.