Overview
Alternating heat and cold produces strong, repeatable acute effects — vasodilation, vasoconstriction, alertness — and has a long cultural history. What it produces beyond the session is less settled: research on contrast methods for recovery is mixed, and much of it studies cold-water contrast in athletes rather than sauna rounds at home. Run it because the sessions are worth it on their own terms, not because a specific physiological outcome is guaranteed. Heat and cold both stress the cardiovascular system; if you have a heart condition, talk to a doctor first.
Evidence level
Mixed. Studies conflict or benefits depend heavily on context. How Compound evaluates evidence
