Hot Baths Trigger Exercise-Like Effects
Dr. Joseph Mercola - Take Control of Your Health
Briana Mercola
4.6 • 1.6K Ratings
🗓️ 1 October 2025
⏱️ 8 minutes
🧾️ Download transcript
Summary
- A 45-minute hot bath raises your core body temperature by 1.1 degrees C (2 degrees F) and boosts cardiac output as much as a moderate-intensity cardio workout
- Hot water immersion increases immune activity, helps control inflammation, and supports immune surveillance
- Compared to traditional and infrared saunas, hot baths triggered the strongest cardiovascular and immune responses due to water's more efficient heat transfer
- Very hot water dries out your skin, alters its pH, and disrupts your skin microbiome, especially if you have eczema, rosacea, or sensitive skin
- You can reduce risks by keeping bath sessions under 30 minutes, moisturizing with coconut oil immediately afterward, and rotating with sauna usage if hot baths irritate your skin
Transcript
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| 0:00.0 | What if you could raise your core temperature by more than a full degree and push your heart to pump like you're doing cardio without taking a single step? |
| 0:08.0 | Welcome to Dr. Mercola's cellular wisdom. Stay informed with quick, easy to listen summaries of our latest articles, perfect for when you're on the go. No reading required. |
| 0:18.0 | Subscribe for free at Mercola.com for the latest health insights. |
| 0:21.6 | Hello and welcome to Dr. Mercola's cellular wisdom. I'm Ethan Foster and today we're |
| 0:28.5 | unpacking how a simple hot bath can deliver exercise like cardiovascular and immune |
| 0:33.4 | effects along with the limits you need to respect so you protect your skin and stay safe. |
| 0:39.3 | I'm Alara Sky. We're focusing on hot water immersion compared head-to-head with traditional |
| 0:44.6 | and far-infrared sonnas. The take-home is clear. When used the way people actually use them, |
| 0:50.7 | hot baths create a stronger thermoregulatory, cardiovascular, and immune challenge than either |
| 0:56.5 | sonotype. |
| 0:58.0 | A recent University of Oregon trial in the American Journal of Physiology tracked 20 healthy |
| 1:03.2 | adults, 10 women and 10 men in their early 20s, who weren't on medication and exercised |
| 1:09.2 | about three times a week. Each participant completed three separate sessions, spaced a week apart, |
| 1:14.6 | to test hot water immersion, a traditional sauna, and a far infrared sauna, |
| 1:19.6 | so researchers could compare each person's response across all three modalities. |
| 1:24.6 | Hot water at 40.5 degrees Celsius, roughly 105 degrees Fahrenheit. |
| 1:30.9 | For 45 minutes, raised core body temperature by 1.1 degrees Celsius. In contrast, a traditional |
| 1:38.0 | sauna at 80 degrees Celsius taken in three 10-minute bouts nudged core temperature up just |
| 1:43.8 | 0.4 degrees Celsius, and the far |
| 1:47.0 | infrared sauna didn't raise core temperature at all. That magnitude of heat load is what kicks |
| 1:52.8 | on your body's heat dissipation systems. Cardiac output told the same story. During hot baths, the |
| 1:59.6 | amount of blood pumped each minute climbed by 3.7 |
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