Become a Member

Get access to more than 30 brands, premium video, exclusive content, events, mapping, and more.

Already have an account? Sign In

Become a Member

Get access to more than 30 brands, premium video, exclusive content, events, mapping, and more.

Already have an account? Sign In

Brands

Training News for Women

The Secret to Athletes’ Exercise Capacity

Perhaps the key to improving exercise capacity has been hidden in your gut all this time.

Get full access to Outside Learn, our online education hub featuring in-depth fitness and nutrition courses and more than 2,000 instructional videos when you sign up for Outside+.

According to a study published in Nature Medicine, a gut bacteria called Veillonella was found in abundance in athletic people but was almost completely absent in the guts of sedentary people.

Why? Turns out that Veillonella metabolizes lactic acid as its primary food source, converting it to propionate, a short-chain fatty acid that is used to improve exercise capacity. Since athletes are continually producing lactic acid during exercise — something the microbe favors — the microbe in turn creates something that benefits the host. Yay symbiosis!