Impact of a fat-rich diet on endurance in man: role of the dietary period

Time to exhaustion increased by 166% in the fat-rich diet group and 150% in the carbohydrate-rich diet group after 4 weeks of training.

• Endurance performance improved in both diet groups after 4 weeks of training.
• Maximal oxygen uptake increased by 9% in both the fat-rich and carbohydrate-rich diet groups.
• The respiratory exchange ratio (RER) was significantly lower during exercise in the fat-rich diet group after 4 weeks compared to both the initial test and the carbohydrate-rich diet group.
• No changes were observed in RER for the carbohydrate-rich diet group.

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