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Effect of Fat- and Carbohydrate-rich Diets on Metabolism and Running Performance in Trained Adolescent Boys.
AuthorsCouto PG, et al. Show all Journal
J Pediatr Gastroenterol Nutr. 2014 May 5. [Epub ahead of print]
Affiliation
Abstract
OBJECTIVES:: A randomized crossover trial was designed to analyze the impact of a short-term, isoenergetic fat- or carbohydrate (CHO)-rich diet on substrate oxidation rates during submaximal exercise and on performance in a 10,000-m running time trial in trained, mid- to late-pubertal boys.
METHODS:: An incremental test was performed to determine the peak oxygen uptake (VO2peak). After two days on a fat-rich (24.2 ± 0.8% CHO, 60.4 ± 0.3% fat, and 15.5 ± 1.0% protein), CHO-rich (69.3 ± 1.2% CHO, 15.9 ± 2.1% fat, and 15.1 ± 1.1% protein), or habitual (56.1 ± 7.0% CHO, 27.5 ± 4.9% fat, and 16.5 ± 4.0% protein) diet, nineteen trained adolescent boys (15.2 ± 1.5 yr) performed a 10-minute constant run at 65% VO2peak to determine the respiratory exchange ratio (RER) during exercise and a 10,000-m running on an outdoor track.
RESULTS:: During the constant run, the RER and CHO contribution to energy expenditure were lower, and fat contribution higher, in the fat-rich diet than in the CHO-rich diet (P < 0.05), but the results were not different from those of the habitual diet. Performance in the 10,000-m run after consuming CHO- and fat-rich diets was similar to performance after a habitual diet (50.0 ± 7.0, 51.9 ± 8.3, and 50.9 ± 7.4 min, respectively), but consuming a CHO-rich diet enhanced performance compared to that after the fat-rich diet (P = 0.03).
CONCLUSIONS:: These findings indicate that CHO-rich diet provides additional benefits to 10,000-m running performance in trained adolescent boys compared to fat-rich diet.
AuthorsCouto PG, et al. Show all Journal
J Pediatr Gastroenterol Nutr. 2014 May 5. [Epub ahead of print]
Affiliation
Abstract
OBJECTIVES:: A randomized crossover trial was designed to analyze the impact of a short-term, isoenergetic fat- or carbohydrate (CHO)-rich diet on substrate oxidation rates during submaximal exercise and on performance in a 10,000-m running time trial in trained, mid- to late-pubertal boys.
METHODS:: An incremental test was performed to determine the peak oxygen uptake (VO2peak). After two days on a fat-rich (24.2 ± 0.8% CHO, 60.4 ± 0.3% fat, and 15.5 ± 1.0% protein), CHO-rich (69.3 ± 1.2% CHO, 15.9 ± 2.1% fat, and 15.1 ± 1.1% protein), or habitual (56.1 ± 7.0% CHO, 27.5 ± 4.9% fat, and 16.5 ± 4.0% protein) diet, nineteen trained adolescent boys (15.2 ± 1.5 yr) performed a 10-minute constant run at 65% VO2peak to determine the respiratory exchange ratio (RER) during exercise and a 10,000-m running on an outdoor track.
RESULTS:: During the constant run, the RER and CHO contribution to energy expenditure were lower, and fat contribution higher, in the fat-rich diet than in the CHO-rich diet (P < 0.05), but the results were not different from those of the habitual diet. Performance in the 10,000-m run after consuming CHO- and fat-rich diets was similar to performance after a habitual diet (50.0 ± 7.0, 51.9 ± 8.3, and 50.9 ± 7.4 min, respectively), but consuming a CHO-rich diet enhanced performance compared to that after the fat-rich diet (P = 0.03).
CONCLUSIONS:: These findings indicate that CHO-rich diet provides additional benefits to 10,000-m running performance in trained adolescent boys compared to fat-rich diet.
