If you’re one of those everyday runners who already loves a post-run sauna or a soak in the hot tub, there’s actually science behind why that steamy ritual feels so good – and why it might help you run stronger, longer, and recover faster.
And if you’re reading this during a long Minnesota winter (here at Duluth Runner, we feel you), heat exposure can be an especially appealing way to support training when cold, snow, and ice dominate the forecast. Heat isn’t just relaxing; it creates physiological stress that prompts your body to adapt in ways that benefit endurance performance and overall cardiovascular health.
Turn Up the Heat – and the Benefits
Regular heat exposure – whether from a dry sauna, infrared session, or even a hot tub soak – elevates heart rate, expands blood volume, and improves circulation. Over time, this leads to better thermoregulation, improved cardiovascular efficiency, and more effective oxygen delivery to working muscles.
Research on trained runners shows that adding post-run sauna sessions (about 20–30 minutes a few times per week) improved VO₂ max and running performance without adding extra mileage. Heat exposure also increases plasma volume, helping runners tolerate harder efforts and warmer conditions.
Hot Tubs Count Too
No sauna? No problem. Hot tubs can deliver many of the same benefits. Studies show that hot water immersion raises core body temperature effectively, increases blood flow, and stimulates cardiovascular and recovery-related adaptations similar to sauna use.
A Touch of Altitude-Like Adaptation
While heat training doesn’t replace high altitude training, it does trigger some similar physiological responses, such as expanded blood volume and improved oxygen transport efficiency. Research suggests heat acclimation can lead to endurance improvements comparable to altitude strategies, making sauna or hot tub exposure a practical alternative for runners who train at sea level.
Optimal Heat for Runners
To gain the benefits seen in research:
- Sauna temperature: approximately 160–200°F (70–93°C)
- Hot tub temperature: approximately 100–104°F (38–40°C)
Most studies emphasize moderate-to-high heat exposure that raises core body temperature without causing dizziness or distress.
How Runners Can Use Heat Wisely
- Use heat after workouts, not before
- Start with 10–15 minutes and build gradually to 20–30 minutes
- Hydrate well and replace electrolytes
- Exit immediately if feeling dizzy or unwell
The Bottom Line
Whether it’s a gym sauna, backyard hot tub, or post-run soak at home, heat exposure can be a powerful, and enjoyable, addition to a runner’s routine. You’re not just relaxing; you’re adapting, recovering, and giving your endurance a warm boost – even when winter running in Minnesota feels endless.