Sauna & Heat Therapy: What does the Research Say?
Sauna & Heat Therapy: What Does the Research Say?
Sauna bathing and other forms of passive heat exposure have been used for generations as part of relaxation, recovery, and wellness routines.
Today, researchers continue to study how repeated heat exposure affects the body, including changes in circulation, heart rate, blood pressure, and overall cardiovascular response.
How does heat exposure affect the body?
During a sauna session, skin temperature rises and the body works to regulate heat. Blood vessels near the skin widen, heart rate can increase, and sweating helps cool the body.
These short-term responses are well established. Researchers are also studying whether repeated heat exposure over time may contribute to broader wellness and cardiovascular effects.
Why do people use saunas?
People commonly use sauna for:
- Relaxation
- Warmth and comfort
- Post-exercise recovery
- A regular wellness routine
- Time for rest and stress reduction
Individual experiences vary, and the way a person uses sauna, including temperature, duration, frequency, and sauna type, can differ significantly.
What is being studied?
Research has explored sauna and other passive heating methods in relation to:
- Cardiovascular response
- Blood pressure changes
- Vascular function
- Exercise recovery
- Perceived wellbeing
- Heat adaptation
Recent systematic reviews have found that passive heating can influence some cardiovascular measures, although results are not consistent across all outcomes and research protocols vary considerably. PubMed Central (PMC)
A 2025 review of passive heat therapy in people with cardiovascular disease also noted that the research includes several different heating methods and treatment schedules, making it difficult to apply one specific protocol to everyone. PubMed
What is still being learned?
Sauna research is continuing to evolve.
Studies differ in:
- Sauna type
- Temperature
- Humidity
- Session length
- Frequency of use
- Population being studied
Because of those differences, it is difficult to say that one specific sauna routine will produce the same outcome for every person.
Practical considerations
Comfort and tolerance matter.
People new to sauna may prefer shorter sessions and gradually increase exposure based on how they feel.
Hydration is also important because sauna use increases sweating and fluid loss.
People with medical conditions or concerns about heat exposure should discuss sauna use with their healthcare professional.
The bottom line
Sauna can be a comfortable, restorative addition to a wellness routine for people who enjoy heat exposure.
Research continues to explore how sauna and passive heating affect the body, particularly cardiovascular function and recovery. The best approach is to use sauna as one part of a broader lifestyle that includes movement, sleep, hydration, nutrition, and appropriate medical care.
References
Rodrigues S, et al. Passive heat therapy for cardiovascular disease: current evidence and future directions. 2025. (pubmed.ncbi.nlm.nih.gov)
Non-acute effects of passive heating interventions on cardiometabolic risk and vascular health: systematic review and meta-analysis of randomized controlled trials. 2025. (pubmed.ncbi.nlm.nih.gov)
Heat thermotherapy to improve cardiovascular function and cardiometabolic health: a systematic review and meta-analysis. 2025.
Effects of Post-Exercise Heat Exposure on Acute Recovery and Training-Induced Performance Adaptations: A Systematic Review. 2025. (pubmed.ncbi.nlm.nih.gov)
Clinical Effects of Regular Dry Sauna Bathing: A Systematic Review. Review of 40 clinical studies involving 3,855 participants. (pubmed.ncbi.nlm.nih.gov)
Vital Reform House provides educational information only. This content is not medical advice and is not intended to diagnose, treat, cure, or prevent disease.
