Athletes are always looking for an edge, and it turns out one might be found not in the gym, but in the sauna. Heat acclimation – the process of adapting to hot conditions – can enhance endurance and performance, especially in hot weather.
While traditional athletes acclimate by training in the heat, sitting in a sauna after exercise can produce similar adaptations. Research has shown that adding post-workout sauna sessions can increase endurance performance in athletes.
How Sauna Sessions Aid Performance
When you regularly expose yourself to high heat, your body gradually adapts. Your plasma volume (the liquid part of blood) increases, which improves cardiovascular function. You start to sweat earlier and more efficiently, enhancing cooling.
Your heart rate for a given workload might decrease because your body becomes better at handling heat stress. All these changes can help an athlete perform better, particularly in hot conditions, but even in cooler conditions, thanks to improved overall cardiovascular capacity.
One notable study in distance runners had them sit in a sauna for about 30 minutes after their regular training runs, several times a week for three weeks. The results were impressive: on a subsequent treadmill test to exhaustion, the runners who did post-exercise saunas improved their endurance by 32% compared to when they hadn’t been using the sauna.
This translates to running nearly a third longer before exhaustion – a huge difference. The sauna group also showed a roughly 7% increase in blood plasma volume. The researchers concluded that the sauna sessions produced beneficial adaptations similar to those we see with traditional heat training (like exercise in hot weather).
To break down some potential benefits of heat acclimation via saunas:
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Increased Blood Volume: More plasma means the heart can pump more blood per beat, delivering oxygen to muscles more effectively. This supports endurance.
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Better Cooling: An acclimated athlete will start sweating sooner and more, which cools the body efficiently and delays overheating during exercise.
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Lower Core Temperature: Regular heat exposure can lead to a lower resting core body temperature and a higher threshold before the body triggers heavy sweating. This means you can handle exercise heat better without performance declining.
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Heart Efficiency: Over time, the heart doesn’t have to beat as fast at a given exercise intensity in the heat. Your circulatory system becomes more efficient at distributing blood between muscles and skin (for cooling).
All of these changes can give you an edge, whether you’re a runner, a cyclist, or play team sports. For instance, if you’re a marathoner preparing for a race in warm conditions, doing sauna sessions in the weeks prior can simulate some of the heat stress and get your body ready for the real thing.
Practical Tips for Athletes Using Saunas
If you’re an athlete thinking of using saunas to boost performance, here are some practical considerations:
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Timing: The easiest method is to use the sauna right after your workout (within about 30 minutes after exercise). This way, you’re already warmed up, and you can extend that heat exposure. Plus, it doubles as a relaxation and recovery session.
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Duration & Frequency: In studies, athletes did around 20–30 minutes per session, several times a week (e.g., 3–4 times weekly for a few weeks). Start at shorter times if you’re new to it (maybe 10–15 minutes) and build up as you feel comfortable.
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Hydration and Minerals: Sweating in a sauna will cause fluid and electrolyte loss. Be sure to rehydrate with water and consider a sports drink or adding electrolytes if you sauna frequently, to replace sodium and other minerals.
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Listen to Your Body: Heat can be demanding. If you feel dizzy or unwell, leave the sauna and cool down. It’s normal for your heart rate to be elevated (similar to light exercise) and to sweat heavily, but you shouldn’t feel like you’re going to faint.
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Keep It Up: Heat adaptations fade after a few days if not maintained. To keep the benefits, continue regular sauna sessions until your target event, and maybe as upkeep during training cycles in hot seasons.
It’s fascinating that something as simple as sitting in a wooden hot room could translate to measurable performance gains on the track or field. For athletes, incorporating sauna bathing is a relatively low-tech, drug-free way to potentially enhance training outcomes. If you're considering adding one to your routine, you can browse all sauna options at Inner Light Sauna – from compact indoor models to spacious outdoor builds designed for serious recovery.
And for recreational fitness enthusiasts, it can add an extra health boost to your routine. Just remember, it’s one tool among many – you still have to put in the training! But those sweaty minutes in the sauna could be the secret sauce that helps you go a bit farther or faster when it counts.
References
Kirby, N. V., Lucas, S. J. E., Cable, T. G., Armstrong, O. J., Weaver, S. R., & Lucas, R. A. I. (2021). Intermittent post‑exercise sauna bathing improves markers of exercise capacity in hot and temperate conditions in trained middle‑distance runners. European Journal of Applied Physiology, 121(2), 621–635. https://doi.org/10.1007/s00421-020-04541-z
Scoon, G. S. M., Hopkins, W. G., Mayhew, S., & Cotter, J. D. (2007). Effect of post‑exercise sauna bathing on the endurance performance of competitive male runners. Journal of Science and Medicine in Sport, 10(4), 259–262. https://doi.org/10.1016/j.jsams.2006.06.009
Stanley, J., Halliday, A., D’Auria, S., Buchheit, M., & Leicht, A. S. (2015). Effect of sauna‑based heat acclimation on plasma volume and heart rate variability. European Journal of Applied Physiology, 115(4), 785–794. https://doi.org/10.1007/s00421-014-3060-1
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