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Heat Therapy

Regular heat exposure (sauna, hot baths) improves cardiovascular function, cognitive health, exercise performance, and metabolic markers.

Cardiovascular Benefits

  • Endothelial function: 15-20% improvement
  • Arterial stiffness: 8-12% reduction
  • Heart rate variability: enhanced

Cognitive Health

  • 4-7 sauna sessions/week: 66% lower Alzheimer's risk
  • Dose-response relationship observed

Performance

  • Time to exhaustion: +32%
  • Blood volume: +7%

Passive heating trials & BP (systematic review)

Pizzey et al. 2021 (Exp Physiol; PMID 33866630; pizzey-2021-heat-therapy-bp-vascular-meta-exp-physiol) meta-analysed 15 studies: pooled lower MAP/SBP/DBP and improved flow-mediated dilation versus control after repeated passive heat exposures—GRADE moderate for several BP domains in the abstract; pair with Kuopio-style sauna cohort rows for long-term outcomes, not as duplicate proof.

Sauna stacked on exercise vs sauna in coronary disease (RCT discipline)

  • Post-exercise sauna add-on (CVD risk factors): Lee et al. 2022 (Am J Physiol Regul Integr Comp Physiol; PMID 35785965; lee-2022-sauna-after-exercise-eight-week-rct-ajpregu) — 8 wk exercise + 15 min post-exercise sauna vs exercise alone in sedentary adults with ≥1 classic risk factor: ~−8 mmHg additional SBP signal vs exercise-only and extra CRF gain—n ≈ 47.
  • Stable CAD (null vascular biomarker trial): Debray et al. 2023 (J Appl Physiol; PMID 37650138; debray-2023-sauna-stable-cad-vascular-rct-j-appl-physiol) — 8 wk unsupervised Finnish sauna (4×/wk) did not improve brachial FMD, cf-PWV, or clinic BP vs control despite heat-acclimation signs—do not merge with Lee healthy-risk-factor cohorts.

Post-exercise recovery (RCT)

Dolezal et al. 2020 (linked row): randomised post-training sauna vs passive recovery—reports lower muscle soreness and next-session performance signals in the trial; read alongside Laitinen/Chiba performance rows, not as a substitute for long-term mortality cohorts on the Sauna protocol.

Protocol

  • 20-30 min at 80-100°C, 3-7 sessions/week

Tertiary map

Wikipedia: Hyperthermia (wikipedia-hyperthermia-overview) separates clinical / exertional core-temperature language from comfort-range dry-sauna practice—dementia HRs and performance %Δ stay on linked PubMed rows here. Wikipedia: Balneotherapy (wikipedia-balneotherapy-overview) covers thermal / mineral-water spa bathing lineages that overlap culturally with sauna use—RCT outcomes remain on linked PubMed rows here. Wikipedia: Hydrotherapy (wikipedia-hydrotherapy-overview) adds broader hydropathy / water-cure navigation.

Evidence