Do infrared saunas improve workout recovery? The evidence remains lukewarm

Overview

The Conversation reports on a 2026 analysis of infrared saunas for post-exercise recovery, comparing infrared heat with traditional saunas and exploring whether any recovery benefits come from faster tissue repair or simply a perceived reduction in soreness. The article also discusses photobiomodulation, study limitations, and practical safety considerations.

• Infrared saunas heat the body more directly at lower air temperatures than traditional Finnish saunas.
• Evidence for accelerated muscle repair from infrared heating is weak and inconsistent.
• Some studies note improved perceived recovery or soreness, but objective performance markers show little, if any, reliable benefit.
• Saunas may promote relaxation and sleep quality in some contexts, but infrared sauna studies after exercise do not consistently improve sleep or resolution of muscle damage markers.

Author: The Conversation

Overview

Infrared saunas are increasingly marketed as a post‑exercise recovery tool, but the evidence supporting their use for speeding up muscle repair remains lukewarm. The Conversation article explains that traditional Finnish saunas heat the surrounding air to roughly 70–100°C, while infrared saunas heat the body more directly with panels that emit infrared radiation, allowing operation at a lower air temperature (40–60°C). The piece stresses that infrared heating is not photobiomodulation or red‑light therapy, which uses light to elicit biological effects without substantial heating. An infrared sauna primarily provides whole‑body heat. This distinction matters because the clinical applications and standardization of photobiomodulation are still under investigation, whereas infrared heating is a heat‑based intervention with different physiological implications.

How heat might aid recovery

Heat exposure can widen skin blood vessels and activate heat‑shock proteins and other cellular pathways linked to stress protection and tissue repair. This provides a plausible rationale for exploring heat as a recovery strategy. However, physiological plausibility does not guarantee meaningful improvements. A key limitation in many studies is the lack of intramuscular temperature measurement, so it remains unclear whether the target muscles reach the heat levels needed to trigger proposed repair mechanisms.

Another common recovery claim is that heat enhances blood flow and lactate clearance. The article corrects a widespread misconception: lactate accumulation is not what drives delayed muscle soreness after strenuous exercise, and clearing lactate more quickly would not necessarily accelerate tissue repair or soreness reduction the next day. The review of the 2025 systematic review highlights this point, noting that lactate is a short‑lived metabolite and its clearance is not a reliable marker of recovery speed.

Evidence from systematic reviews and key studies

A 2025 systematic review (14 studies, 194 participants) evaluated whole‑body heating after exercise, including infrared saunas, traditional saunas, and hot‑water immersion. Nine studies focused on recovery; only two examined infrared saunas. Among the nine recovery studies, four reported some benefit, four found no effect, and one found worse subsequent performance. The overall quality of evidence was rated low to moderate, with notable risk‑of‑bias concerns. Whole‑body heating generally showed little to no consistent effect on markers of muscle damage or inflammation. This suggests that infrared sauna effects on objective recovery markers are not robust across studies.

Several older but influential studies are summarized to illustrate the nuance. A 2015 study in ten physically active men compared post‑exercise recovery with a 30‑minute far‑infrared sauna versus passive rest after either strength or endurance exercise. After strength training, recovery was not improved; after endurance exercise, jump performance during a 30‑minute recovery period was slightly better with the sauna. A systematic review on muscle warming indicates that raising muscle temperature can boost rapid force development and power, but not maximal force, implying that any short‑term improvements might resemble a warm‑up effect rather than true accelerated repair.

A 2023 crossover study involving 16 male basketball players reported after 14 hours that sauna use reduced the decline in jump performance, and participants felt less soreness. However, sprint speed, maximal leg strength recovery, sleep duration, and sleep quality were not improved, and blood markers of muscle damage were unchanged. The authors noted the absence of a convincing placebo condition and acknowledged that expectations could have influenced perceptions of recovery and soreness.

Placebo effects and the placebo problem

The absence of a plausible placebo sauna in the cited studies complicates interpretation. If participants know they are receiving the intervention, positive expectations could bias subjective outcomes like soreness and perceived recovery, even when physiological markers do not corroborate the benefits. This is an important caveat when evaluating the practical value of infrared saunas in real‑world training settings.

Heat versus warm‑up and hot conditions

Some evidence indicates that heating may preserve certain explosive abilities or generate short‑term performance benefits by warming tissues. Yet these effects might reflect a warm‑up phenomenon rather than faster tissue repair. Heat acclimation in hot conditions, typically achieved through repeated heat exposure, has demonstrated more robust physiological adaptations, but results from hot‑water or infrared heating do not automatically generalize to infrared sauna protocols designed for recovery.

Sleep, relaxation, and safety

Cross‑sectional survey data suggest sauna users report reductions in stress and improvements in sleep, but such evidence is limited by self‑report and single‑timepoint collection. The 2023 post‑exercise recovery study noted that subjective sleep quality after infrared sauna use did not outperform passive rest. The take‑home message is that infrared saunas may promote relaxation and perceived recovery, but they are unlikely to replace sleep, nutrition, and hydration as the core recovery pillars. Safety considerations emphasize that sauna heat can temporarily lower blood pressure while raising heart rate; anyone feeling dizzy or nauseated should exit and cool down. Moderate sauna use is generally well tolerated among healthy adults, but individuals with unstable cardiovascular conditions should seek medical advice before use.

Bottom line

Taken together, the available literature suggests infrared saunas may influence how recovered a person feels and may help preserve certain explosive performance aspects in some contexts, but they do not provide consistent evidence of faster muscle repair or reliable improvements in standard recovery markers. They are best viewed as a relaxation and recovery aid that complements, rather than replaces, proven recovery strategies such as adequate sleep, proper nutrition, and hydration.