Metabolic characteristics of keto-adapted ultra-endurance runners
Metabolism, Clinical and Experimental
Many successful ultra-endurance athletes have switched from a high-carbohydrate to a low-carbohydrate diet, but they have not previously been studied to determine the extent of metabolic adaptations.
Twenty elite ultra-marathoners and ironman distance triathletes performed a maximal graded exercise test and a 180 min submaximal run at 64% VO2max on a treadmill to determine metabolic responses.
Results: Compared to highly trained ultra-endurance athletes consuming an HC diet, long-term keto-adaptation results in extraordinarily high rates of fat oxidation, whereas muscle glycogen utilization and repletion patterns during and after a 3 hour run are similar.
Jeff Volek - Ketogenic Diet Research
Why Is A Low Carb Diet Good for You?
Jeff S. Volek Ph.D., R.D.