Adaptation to a low carbohydrate high fat diet is rapid but impairs endurance exercise metabolism and performance despite enhanced glycogen availability.

The performance changes from Race 1 to Race 2 in the current study were significantly different and manifested as a uniform and significant improvement in race times in the HCHO group and a strong trend to performance impairment in the LCHF group, with only one participant recording a faster race outcome in Race 2 following the LCHF adaptation/enhanced CHO availability intervention.

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