The Effects of High Fat Diet on Energy Metabolism in Endurance Training

Journal of Exercise Nutrition & Biochemistry 1997;1(1):87-112.

Abstract

This study was performed to present the most effective diet protocol(DP) in endurance training and also to elucidate the effect of HFAT on body composition, serum components, 15㎞ run record, and gas exchange ratio. Four high school long distance runners were chosen as subjects in this experiment. Endurance training and high fat diet(20% of proteins, 51% of lipids, and 29% of carbohydrates) were applied to these subjects for 20 days. Gas exchage ratio was tested through modified treadmill exercising test before and after the experiment. Body composition, serum components, and 15㎞ run records were analyzed through 15㎞ run performed with 10days of interval during endurance training given with high fat diet. As a result of 2 experiments for 20 days, these subjects showed decreases in the production of total body water through 15㎞ run. Serum insulin was decreased, whereas serum glucagon, serum triglyceride, and serum free fatty acids were increased before 15㎞ run. Serum glucagon was decreased, but serum insulin, serum glucose, serum triglyceride, and serum free fatty acids were increased after 15㎞ run. Also, respiratory quotient was decreased by an increase of oxygen intake and a decrease of carbon dioxide production. These results suggest that high fat diet was an effective diet protocol in accelerating 15㎞ run. Therefore, it was obvious that "Glucose-FFA cycle" is available during exercise and at rest.