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I'm sure most people can relate. During an intense exercise, the last thing you focus on is how you're breathing. Whether through your mouth or your nose, you simply need more oxygen to keep going. However, the way you breathe can meaningfully shift your stamina and make your workouts much more efficient. This is where nasal breathing comes into play.
Why Breathing Through Your Nose Matters
Most of us default to gulping air through the mouth the moment exercise gets hard. It feels like the fastest way to get more oxygen. But your nose does things your mouth simply can't.
Breathing through your nose filters, warms, and humidifies the air before it reaches your lungs. It also slows your breathing down and helps you take fuller, deeper breaths rather than shallow, rapid ones. The result is often more efficient breathing, where you move less air but use it better.
The Nitric Oxide Connection
Here's the part most people don't know. When you breathe through your nose, your sinuses release a gas called nitric oxide that mouth breathing largely skips.
Nitric oxide is a vasodilator, meaning it helps widen your blood vessels. This can help improve blood flow and the delivery of oxygen throughout the body. So nasal breathing isn't just filtering your air, it can help your body actually use the oxygen you take in more effectively.
What the Research Suggests
Studies comparing nasal and mouth breathing during exercise have found that nasal breathing tends to be more efficient. People often move less total air and clear carbon dioxide more effectively for the same amount of work.
One training study found that people who practiced nasal breathing during aerobic exercise for several weeks improved their oxygen uptake and breathed more efficiently than those who breathed through the mouth.
The research is still developing, and nasal breathing won't necessarily make you faster overnight. But as a way to train more efficient breathing over time, the evidence is promising.
How to Give It a Try
Note that at very high intensities, your body will naturally need more air than your nose can supply, and switching to mouth breathing is completely normal.
Nasal breathing isn't about restricting yourself. It's about training more efficient breathing at the intensities where it's doable, and letting your body adapt over time. Overall, it's a simple shift that can go a long way. Train it gradually, let your body adapt, and you may find yourself going further with less effort!
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