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20 October 2026Heat therapy is the practice of warming the whole body in a controlled way, and research links regular heat with healthier blood vessels, lower blood pressure and fewer heart events over the long term. That is good news for anyone who wants to look after their heart in a relaxing way. This guide shares five heart-friendly reasons to try heat therapy, what each study measured and how to enjoy it safely. You can explore the service on Aeva’s hyperthermia therapy page.
Table of Contents
Why the Heart Loves a Little Warmth
When your body warms up, your blood vessels widen, your skin flushes and your heart beats a little faster to move blood around. In many ways, this resembles the effect of light exercise, which is one reason researchers have been curious about heat for years. Done in a controlled, comfortable way, heat gives the circulation a gentle workout while you rest.
It is important to say clearly that heat therapy is a supportive wellness habit, not a replacement for exercise, healthy eating or medical care. With that in mind, the studies below are encouraging and show why so many people include heat in their routine.
Heat Therapy at a Glance
- Vessels: eight weeks of repeated heat improved blood vessel function in sedentary adults.
- Arteries: the same trial found lower arterial stiffness than a sham group.
- Blood pressure: blood pressure was lower after the heat programme.
- Long term: frequent heat sessions were linked with a 63% lower risk of sudden cardiac death in 2,315 Finnish men.
- Session: a heat therapy session at Aeva takes about 45 minutes, including screening and cooling time.
1. Healthier Blood Vessel Function
The inner lining of your blood vessels, called the endothelium, helps control how widely they open and how smoothly blood flows. Doctors often check it with a test called flow-mediated dilation. In a randomised trial published in the Journal of Physiology, sedentary adults completed eight weeks of repeated hot water immersion, and their flow-mediated dilation improved compared with a sham group.
That matters because a healthy endothelium is one of the foundations of a healthy circulation. The researchers noted that the changes were similar to or greater than those usually seen with exercise training in sedentary people, which makes heat therapy an interesting supportive option for people who find exercise challenging. It is not a reason to skip activity, but it is a welcome addition.
Source: Brunt et al., Journal of Physiology, 2016.
2. Softer, More Flexible Arteries
Arteries naturally become stiffer with age, and flexible arteries cope better with each heartbeat. In the same trial, the heat therapy group showed lower arterial stiffness than the sham group after eight weeks. This is a measurable change in how the vessel wall behaves, not just a feeling.
Together with better endothelial function, softer arteries are part of why researchers describe heat as a promising tool for vascular health. As always, a single trial is a starting point, and larger studies will tell us even more about who benefits most and what schedule works best.
Source: Brunt et al., Journal of Physiology, 2016.
3. Lower Blood Pressure
Blood pressure is one of the best-known numbers in heart health. Participants in the same eight-week programme also had lower blood pressure than the sham group by the end of the trial. A calmer, more flexible circulation is exactly what you would expect to see alongside the vessel changes described above.
If you already take medication for blood pressure, or if your readings run low, please speak to your doctor before you begin, because heat widens blood vessels and your treatment may need to be considered. Our team will also ask about this during screening. You can read more in our guide to hyperthermia therapy insights for heart, mood and recovery.
Source: Brunt et al., Journal of Physiology, 2016.
4. A Strong Long-Term Association With Heart Health
Long-term studies add an important perspective. A study in JAMA Internal Medicine followed 2,315 middle-aged men from eastern Finland for a median of 20.7 years. Those who used traditional heat bathing four to seven times a week had a 63% lower risk of sudden cardiac death than men who used it once a week.
The study is observational, so it shows a strong association rather than proof that heat itself caused the difference. People who bathe in heat often may also share other healthy habits. Even so, results this consistent across two decades give researchers a strong reason to keep studying regular heat as part of a heart-healthy lifestyle.
Source: Laukkanen et al., JAMA Internal Medicine, 2015.
5. Relaxation That Supports a Calm Heart
Stress and tense muscles make the heart work harder, so anything that helps you unwind is worth including. Most people describe a heat therapy session as deeply relaxing, a quiet 45 minutes away from phones and deadlines. That feeling of calm is a benefit in its own right, and it makes heat therapy a pleasant habit to keep.
Research also points to a link between heat and mood. A double-blind JAMA Psychiatry trial found that adults with major depression who received whole-body hyperthermia improved more on a depression rating scale than those who received a sham. It was a small, early study, but it adds to the picture of warmth supporting both body and mind. See our article on hyperthermia in Kuala Lumpur for more.
Source: Janssen et al., JAMA Psychiatry, 2016.
A Balanced Look at the Evidence
The vessel trial used hot water immersion rather than Aeva’s device, and the long-term study looked at traditional heat bathing in Finland. Both describe the general effect of warming the body, which is the idea behind heat therapy, but they are not studies of a specific machine. Results can differ between people and between methods.
The best way to use this research is as encouragement. Heat therapy is a pleasant way to support your circulation and relaxation, and it sits well alongside the habits with the strongest evidence, such as regular movement, a balanced diet, good sleep and routine check-ups with your doctor.
Study Snapshot: What Each Study Measured
| Study | Who took part | What they did | What was reported |
|---|---|---|---|
| Brunt et al., 2016 | Sedentary adults | Eight weeks of repeated hot water immersion versus sham | Better vessel function, lower arterial stiffness, lower blood pressure |
| Laukkanen et al., 2015 | 2,315 Finnish men | Followed for a median of 20.7 years | 63% lower sudden cardiac death risk with 4 to 7 sessions a week versus once |
| Janssen et al., 2016 | Adults with major depression | Whole-body hyperthermia versus sham | Greater improvement on a depression rating scale |
What a Heat Therapy Session Is Like
A session lasts about 45 minutes, including screening and cooling time. Our team reviews your health history, you drink water, your body is warmed gradually in a purpose-built device with technology from Korea, and you then cool down and rehydrate. The aim is a steady, monitored and comfortable rise in body warmth, which is quite different from simply sitting in a hot room.
Studies used repeated sessions over weeks, so heat therapy works best as a routine. Our team will suggest a rhythm that suits your schedule, and our hyperthermia therapy safety guide lists seven simple checks.
Heart-Healthy Habits That Pair Well
- Aim for 150 to 300 minutes of moderate activity a week, as the World Health Organization recommends for adults.
- Add muscle-strengthening activities on two or more days each week.
- Eat plenty of vegetables, fruit, whole grains and healthy fats.
- Protect your sleep, since regular, restful sleep supports a calm heart.
- Keep up with routine blood pressure and cholesterol checks.
Our guide to a weekly longevity routine shows how to fit these into a busy week.
Who Should Check With a Doctor First
Most healthy adults can enjoy heat therapy. A quick doctor check helps you get the most from it if you have any of the conditions below, as noted in a review by Patrick and Johnson:
- low blood pressure
- a recent heart attack or severe aortic stenosis
- reduced sweating from some autoimmune or neurological conditions
- pregnancy
The friendly team at Aeva Longevity Centre is happy to help you plan a comfortable first visit. See Aeva’s medical leadership for the clinical team, or reach us on the contact page.
Related Reading
- Hyperthermia in Kuala Lumpur: 7 essential facts
- Hyperthermia therapy insights: 5 powerful findings
- Hyperthermia therapy safety: 7 essential checks
- Hyperthermia for athletes
- Recovery technologies compared
- More longevity insights from Aeva
FAQ
What does heat therapy do for heart health?
Research links repeated heat with better blood vessel function, lower arterial stiffness and lower blood pressure in sedentary adults, and a long-term study linked frequent heat bathing with fewer sudden cardiac deaths.
How long is a heat therapy session?
About 45 minutes, including screening and cooling time.
How often should I try heat therapy?
The vessel trial ran for eight weeks of repeated sessions, so a regular routine works well. Our team will suggest a plan for you.
Is heat therapy a replacement for exercise?
No. It is a supportive extra. Regular activity, healthy eating and good sleep remain the foundation of heart health.
Can I enjoy heat therapy if I take blood pressure medication?
Please speak to your doctor first. Heat widens blood vessels, so your doctor can advise on the right approach for you.
Is heat therapy relaxing?
Yes. Most people describe it as deeply relaxing, which is a lovely benefit in its own right.
Sources
- Brunt VE et al. Passive heat therapy improves endothelial function, arterial stiffness and blood pressure in sedentary humans. J Physiol, 2016.
- Laukkanen T et al. Heat bathing frequency and fatal cardiovascular events in Finnish men. JAMA Intern Med, 2015.
- Janssen CW et al. Whole-body hyperthermia for the treatment of major depressive disorder: a randomized clinical trial. JAMA Psychiatry, 2016.
- Patrick RP, Johnson TL. Experimental Gerontology, 2021.
- World Health Organization. Physical activity fact sheet.
General information only, not medical advice. Heat therapy supports wellness and does not replace medical care. Speak to your doctor if you have a health condition.