Endurance Capacity and High-Intensity Exercise Performance Responses to a High-Fat Diet

Body mass decreased significantly by 2.2 kg in subjects on a high-fat/moderate protein diet.

• Maximal oxygen consumption decreased in the high-fat/moderate protein group but remained unchanged when adjusted for body mass.
• Perceived exertion was higher during maximal oxygen consumption tests in the high-fat/moderate protein group.
• Peak and mean power output decreased significantly during the first bout of Wingate sprints in the high-fat/moderate protein group.
• Despite increased fat oxidation, work output during a 45-minute cycling bout significantly decreased by 18% in the high-fat/moderate protein group.
• Reduced exercise performance may be linked to body mass loss and increased perceived exertion.

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