The short answer: Traditional Finnish sauna (80–100°C air temperature) and infrared sauna (45–60°C, heating body tissue directly) both produce measurable health benefits, but through different mechanisms with different research bases. The sauna health benefits mortality data showing a 50% reduction in CVD death at 4–7 sessions per week comes entirely from traditional sauna research. Infrared has stronger evidence for post-exercise recovery and shows unique vascular benefits in older populations.
The distinction between these two sauna types is not marketing language. It is a genuine physiological difference in how heat enters the body, what temperature the air reaches, and, critically, which population cohorts have been studied for long-term outcomes. Conflating the two when citing longevity research is a factual error that is widespread in wellness content.
Andrew Huberman has addressed both sauna types in his sauna essentials episode, noting that the evidence base diverges significantly between traditional and infrared for long-term outcomes.
The Core Difference: How Each Type Heats the Body
Traditional Finnish sauna heats the air in the room to between 80°C and 100°C. The body absorbs that heat primarily through convection: hot air contacts skin, the skin temperature rises, and core temperature follows. The process requires a high ambient temperature precisely because air is an inefficient heat transfer medium. Finnish sauna also produces humidity, either ambient or by pouring water on heated rocks (löyly), which further drives heat absorption by reducing the rate of evaporative cooling from sweat.
Infrared sauna operates at 45–60°C air temperature, a range that feels mild by comparison. The heat delivery mechanism is entirely different: near-infrared (NIR), mid-infrared (MIR), and far-infrared (FIR) wavelengths are emitted by panels and penetrate skin tissue to a depth of 1–4 cm, heating muscle and connective tissue directly without first requiring the surrounding air to reach a high temperature. The body's core temperature rises, sweating occurs, and the cardiovascular system responds, but the route to that response bypasses the requirement for hot ambient air.
The mechanism difference matters because it changes what the body experiences, not just what the room thermometer reads.
Hot water immersion (bath or tank) sits in a third category worth noting: a 2025 meta-analysis reported in ScienceDaily found that immersion raises core temperature more effectively than either sauna type and was the only modality that showed measurable changes in inflammatory markers in that analysis. For most people, however, immersion at therapeutic temperatures is logistically impractical compared to either sauna format.
Where the Big Research Comes From
The cardiovascular and mortality data that underpins nearly every longevity claim about sauna originates from Jari Laukkanen's cohort studies at the University of Eastern Finland. The 2015 study published in JAMA Internal Medicine followed 2,315 middle-aged Finnish men over a median of 20 years. The average sauna temperature in that cohort was 79°C, the format was traditional Finnish sauna, and the session duration averaged 14 minutes. Men using sauna 4–7 times per week showed a 50% reduction in fatal cardiovascular events compared with once-per-week users.
The 2018 follow-up in Mayo Clinic Proceedings extended the findings to dementia and Alzheimer's risk, again using the same traditional sauna cohort. Frequent sauna use (4–7 sessions per week) was associated with a 66% lower risk of developing dementia compared with once-per-week use. These numbers are from a specific format: traditional sauna at temperatures between roughly 70°C and 100°C.
No long-term cohort study of equivalent size or duration has been conducted using infrared sauna. This does not mean infrared sauna is ineffective for cardiovascular health. The mechanisms that drive adaptation (core temperature rise, elevated heart rate, heat shock protein activation) are present in infrared sessions. However, the direct evidence for longevity outcomes at the population level does not exist for infrared in the way it does for traditional. Researchers such as Rhonda Patrick have been explicit about this distinction: her recommendations for cardiovascular longevity targets reference traditional sauna at 77–88°C specifically.
Citing a 50% CVD mortality reduction and then recommending infrared sauna is a category error. The data and the format are inseparable.
What Infrared Does Uniquely Well
The infrared evidence base, while smaller and shorter in follow-up duration, contains findings that traditional sauna research has not replicated. A 2025 study published in Frontiers in Sports and Active Living (PMC11913669) examined female athletes using infrared sauna at 50°C for 10 minutes, three sessions per week over six weeks. Jump height improved by 25% and peak power output increased by 6.8% compared to baseline. The combination of mild heat stress with mechanical training appears to potentiate neuromuscular adaptation in ways not yet documented for traditional sauna at the same post-exercise timing.
A separate line of infrared research concerns vascular density in aged muscle tissue. One infrared intervention in older adults found blood vessel density in muscle increased by 33% following a course of infrared exposure, with no corresponding increase in muscle cross-sectional area. This is a different mechanism to hypertrophy: the adaptation is vascular, not structural, and it may be particularly relevant for older adults whose capillary density in muscle tissue declines with age independently of strength loss.
The whole-body hyperthermia (WBH) protocol for depression studied by Mason and colleagues (2024, PMC12553885) uses an infrared sauna dome specifically, targeting a core temperature of 38.5°C. The protocol is designed to produce a controlled febrile-like state and has shown antidepressant effects in clinical trials. This application specifically requires infrared format because the dome allows selective body heating while the head remains outside the heat environment, which is not possible in a traditional sauna cabin.
Head Heat and Temperature: Why Traditional Needs More Active Management
Traditional sauna creates pronounced heat stratification inside the cabin. Because hot air rises, the temperature at ceiling level in a Finnish sauna can be 10–15°C higher than at bench level. A sauna at 85°C measured at the bench may be 95–100°C at head height when seated upright. The head and neck contain a high density of thermoreceptors and the proximity of the brain to extreme external heat creates a different physiological situation to heat experienced at the torso and limbs.
Infrared sauna, by contrast, distributes heat more uniformly across the cabin. Because the panels emit radiation rather than heating air, there is no hot-air column rising to the ceiling. Head and torso experience similar temperatures. This is one practical advantage of infrared at lower ambient temperatures.
For traditional sauna users, particularly at the higher end of the temperature range used in optimisation protocols (Bryan Johnson uses 93°C / 200°F; Patrick targets 77–88°C), head heat management becomes a relevant consideration. A wool sauna hat insulates the scalp and reduces the rate of heat absorption at the head, allowing longer comfortable session duration at high ambient temperatures. The detail on why head exposure specifically limits session tolerance, and the evidence behind hat use in traditional sauna, is covered in the Rí article Why Your Head Is the Enemy in a Sauna.
Managing head temperature in traditional sauna is not about comfort preference. It is about extending time in the adaptive zone without heat stress overwhelming the session.
How to Choose Between Infrared and Traditional
The choice is goal-dependent, not a matter of one format being categorically superior. Traditional sauna holds the evidence base for cardiovascular longevity, all-cause mortality reduction, and dementia risk. Infrared holds stronger recent evidence for post-exercise recovery performance, vascular adaptation in aged muscle, and the specific clinical depression protocol. Cost and accessibility differ: infrared panels can be installed in a smaller space and at lower electrical load than a traditional Finnish sauna, which requires the room to sustain 80–100°C ambient temperatures and adequate insulation and ventilation.
For people using sauna primarily as a post-workout recovery tool and who do not have access to a traditional sauna, the infrared evidence base is sufficient to justify the practice. For people whose primary interest is replicating the longevity and cognitive risk-reduction data from Laukkanen's cohort research, the format should be traditional Finnish sauna at temperatures above 70°C, at a frequency of at least four sessions per week.
Frequently Asked Questions
Can infrared sauna produce the same cardiovascular benefits as traditional sauna?
The cardiovascular mechanisms (core temperature rise, elevated heart rate, plasma volume expansion, heat shock protein activation) are present in infrared sessions. However, no long-term cohort study has followed infrared sauna users over 20 years at population scale. The 50% reduction in CVD fatal events cited in sauna research comes from Laukkanen's 2015 JAMA Internal Medicine study, which used traditional Finnish sauna at an average temperature of 79°C. Infrared may confer cardiovascular benefits, but the direct evidence at that scale does not yet exist.
Does infrared sauna actually raise core body temperature?
Yes. Despite the lower ambient air temperature (45–60°C versus 80–100°C in traditional sauna), infrared sauna does raise core body temperature measurably. The Mason 2024 depression protocol targets a core temperature of 38.5°C using an infrared dome, and achieves it reliably. The mechanism is direct tissue heating rather than convective air heating. Sweating onset, heart rate elevation, and cardiovascular response all occur, generally within 10–15 minutes of infrared exposure.
What temperature should a traditional sauna be set to for longevity benefits?
The Laukkanen cohort average was 79°C, with a range that reflects typical Finnish sauna practice of 70–100°C. Rhonda Patrick targets 77–88°C in her personal protocol. Bryan Johnson uses 93°C (200°F). The existing evidence does not draw a precise minimum threshold, but sessions below 70°C ambient air temperature in a traditional sauna are unlikely to replicate the thermal load experienced by the cohort subjects in the mortality studies.
Is infrared sauna better for recovery than traditional sauna?
The 2025 Frontiers in Sports and Active Living study (PMC11913669) is the strongest direct evidence for post-exercise infrared sauna: 10 minutes at 50°C, three sessions per week over six weeks produced a 25% improvement in jump height and a 6.8% increase in peak power in female athletes. No equivalent controlled study exists comparing this directly to traditional sauna post-exercise at the same session parameters. The mild temperature of infrared may also be better tolerated immediately after high-intensity training when core temperature is already elevated.
Do you need a sauna hat in an infrared sauna?
No. Sauna hats are designed to address the heat stratification problem in traditional Finnish sauna, where ceiling-level temperatures can be 10–15°C higher than bench level. Infrared saunas heat by radiation rather than by warming air, so temperature is distributed more uniformly throughout the cabin. Head and torso experience similar ambient conditions. A hat is not necessary and does not serve the same protective function it does in a high-temperature traditional sauna.
Can you use infrared sauna if you do not have access to a traditional sauna?
For most non-longevity applications, yes. The post-exercise recovery evidence, the vascular density data, and the depression protocol all use infrared specifically. Infrared panels can be installed in a domestic bathroom or spare room at considerably lower cost and electrical demand than a traditional Finnish sauna cabin. For people whose primary use case is recovery, stress reduction, or the depression protocol studied by Mason (2024), infrared is not a compromise: it is the format the research used.
How does hot water immersion compare to both sauna types?
A 2025 meta-analysis found that hot water immersion raised core temperature more effectively than either infrared or traditional sauna and was the only modality in that analysis to show measurable changes in inflammatory markers. Water conducts heat approximately 25 times more efficiently than air, which explains the faster core temperature response. The practical constraint is that maintaining a bath or cold/hot immersion tank at therapeutic temperatures (38–40°C) for repeated daily use is logistically demanding compared to a sauna session. For most people, sauna remains the more accessible format.
The Bottom Line
Traditional sauna holds the longevity and mortality evidence. Infrared sauna holds stronger recent evidence for post-exercise performance recovery, vascular adaptation in older muscle tissue, and the specific clinical protocol for depression. Neither format is universally superior: the correct choice depends on the outcome being targeted. Anyone citing the Laukkanen cardiovascular mortality data as justification for infrared sauna use is applying research to a format it did not study. Anyone dismissing infrared as insufficiently evidence-based for recovery and vascular applications is ignoring a growing and specific literature that traditional sauna research has not yet addressed.
The research does not say one type of sauna is better. It says different types have been studied for different outcomes, and the format matters when citing the evidence.
Sources
- Laukkanen JA et al. "Association Between Sauna Bathing and Fatal Cardiovascular and All-Cause Mortality Events" JAMA Internal Medicine, 2015.
- Laukkanen JA et al. "Sauna Bathing is Inversely Associated with Dementia and Alzheimer's Disease in Middle-aged Finnish Men" Mayo Clinic Proceedings, 2018.
- Podstawski R et al. "Effects of Far-Infrared Sauna Bathing on Recovery from Strength and Endurance Training Sessions in Female Athletes" Frontiers in Sports and Active Living, 2025.
- Mason A et al. "Whole-Body Hyperthermia and Depression" PMC, 2024.
Last reviewed: March 2026
Last updated: 2 April 2026
The information in this article is for educational purposes only and is not medical advice. Consult your doctor before beginning any sauna protocol.