- EurekAlert: Endurance athletes who ‘go against the grain’ become incredible fat-burners
- Metabolism Journal: Metabolic characteristics of keto-adapted ultra-endurance runners
Interestingly the study also revealed that the low-carb athletes had normal muscle glycogen levels. This was an unexpected finding to Jeff Volek, lead researcher of the study. It could be due to an elegant system for maintaining glycogen levels in muscles even when carbs are limited.