Body Atlas

Who Controls Your Breathing · Lungs

Why do I start breathing hard the moment I start running?

Demand rises, and ventilation rises to meet it — immediately.

The simple answer

Start running and your breathing deepens almost instantly — before carbon dioxide has had any time to build up. Your body anticipates rather than waits.

Go deeper

There's more: demand rises, and ventilation rises to meet it — immediately. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.

Explore this concept in Body Atlas →

Body Atlas is an educational product. It does not provide diagnosis, treatment, or personal medical advice. · Privacy