James Nestor blocked his nose for 10 days at Stanford and his blood pressure shot up 25 points within hours. He started snoring the same night, from zero to four hours, just by switching the pathway he was breathing through. If you're a cyclist and you haven't thought about how you breathe, this episode of the Roadman Cycling podcast is the one to start with.
Key Takeaways
Nestor's Stanford experiment with Anders Olsen is the clearest evidence I've seen that mouth breathing isn't a minor inefficiency, it's actively doing damage. Blood pressure up 25 points, snoring starting within hours, sleep quality tanking within days. The 60% of us who mouth breathe at night are running that experiment on ourselves every single night. The fix is free. A small piece of tape on your lips. I tried it for a week and my resting heart rate dropped three beats. Nestor has been doing it every night for years.
The performance side is what got my attention as a cyclist. Allison McConnell's research in the 90s showed 3 to 4% time trial improvements from inspiratory muscle training over a few weeks. Nestor and Olsen couldn't get their heart rates to 136 bpm while nasal breathing at eight breaths per minute, the body was just too efficient. Elite coaches have known about this for years and kept it quiet. Nestor told me directly. Why would I tell my competitors what's working? Start with a pulse oximeter, costs about ten euro, and watch what happens to your numbers when you switch from mouth to nasal breathing on the bike. The data is right there on your wrist.
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If your heart rate is running high on the bike and you're not sure why, the episode on five fixable reasons your heart rate is elevated covers a lot of the same territory from a different angle. And the Dr. Sellers breathing episode goes deeper into the mechanics of why your legs aren't always the limiter.