Significant effect of a pre-exercise high-fat meal after a 3-day high-carbohydrate diet on endurance performance.
We investigated the effect of macronutrient composition of pre-exercise meals on endurance performance. Subjects consumed a high-carbohydrate diet at each meal for 3 days, followed by a high-fat meal (HFM; 1007 ± 21 kcal, 30% CHO, 55% F and 15% P) or high-carbohydrate meal (HCM; 1007 ± 21 kcal, 71% CHO, 20% F and 9% P) 4 h before exercise. Furthermore, just prior to the test, subjects in the HFM group ingested either maltodextrin jelly (M) or a placebo jelly (P), while subjects in the HCM ingested a placebo jelly. Endurance performance was measured as running time until exhaustion at a speed between lactate threshold and the onset of blood lactate accumulation. All subjects participated in each trial, randomly assigned at weekly intervals. We observed that the time until exhaustion was significantly longer in the HFM + M (p < 0.05) than in HFM + P and HCM + P conditions. Furthermore, the total amount of fat oxidation during exercise was significantly higher in HFM + M and HFM + P than in HCM + P (p < 0.05). These results suggest that ingestion of a HFM prior to exercise is more favorable for endurance performance than HCM. In addition, HFM and maltodextrin ingestion following 3 days of carbohydrate loading enhances endurance running performance.
['Murakami|Ikuma|I|', 'Sakuragi|Takayuki|T|', 'Uemura|Hiroshi|H|', 'Menda|Hajime|H|', 'Shindo|Munehiro|M|', 'Tanaka|Hiroaki|H|']
D001786:Blood Glucose D018592:Cross-Over Studies D004032:Diet D004040:Dietary Carbohydrates D004041:Dietary Fats D004311:Double-Blind Method D004734:Energy Metabolism D005230:Fatty Acids, Nonesterified D006003:Glycogen D006801:Humans D007328:Insulin D007773:Lactates D008297:Male D009752:Nutritional Status D010807:Physical Endurance D011659:Pulmonary Gas Exchange D012420:Running D055815:Young Adult
fat oxidation carbohydrate oxidation glycogen marathon metabolism