Claim Verification: "Contrast therapy alternating sauna and ice bath is scientifically proven superior for recovery and longevity." — Disproved

Automated fact-verification of the claim: "Contrast therapy alternating sauna and ice bath is scientifically proven superior for recovery and longevity." Verdict: DISPROVED Key Findings 3 of 3 independent peer-reviewed meta-analyses and systematic reviews confirm that contrast water therapy (CWT) is not scientifically proven superior to other active recovery modalities (cold water immersion, compression, active recovery). A 2013 PLOS One meta-analysis (18 RCTs) found "little evidence for a superior treatment intervention" when comparing CWT against other active methods. A 2017 PubMed meta-analysis found cold water immersion (CWI) outperforms CWT for neuromuscular recovery after team sport; CWT provided no statistically significant neuromuscular benefit at 24 hours. No prospective cohort studies or RCTs exist that specifically examine combined contrast therapy (sauna + cold immersion) and longevity outcomes in humans. The sauna-longevity evidence (Laukkanen et al.) studies sauna use alone, not contrast therapy. Files proof.py — Re-runnable Python verification script proof.md — Structured proof report proof_audit.md — Full verification audit trail proof_narrative.md — Plain-language summary proof.json — Machine-readable structured data Generated by Proof Engine v1.3.1.