Postexercise Macronutrient Intake and Subsequent Postprandial Triglyceride Metabolism.

• Autores: Justin R. Trombold, Edward F. Coyle, Kevin M. Christmas, Daniel R. Machin, Douglas W. Van Pelt, Ting-Heng Chou, Il-young Kim
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 46, Nº. 11, 2014, págs. 2099-2106
• Idioma: inglés
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• Resumen

  • AB Acute endurance exercise has been shown to lower postprandial plasma triglyceride (PPTG) concentrations; however, whether this is due to the negative energy and/or CHO deficit from the exercise bout is not well understood. Purpose: This study aimed to examine the effects of a postexercise meal consisting of either high or low CHO content on PPTG and postprandial fat oxidation the morning after an exercise bout. Methods: Healthy young men (n = 6) performed each of four experimental treatments: 1) nonexercise control (CON), 2) 80 min of cycling with either no meal replacement (EX), 3) a high-CHO postexercise meal (EX+HCHO), or a 4) low-CHO postexercise meal (EX+LCHO). A standardized meal for PPTG determination was provided (16.0 kcal[middle dot]kg-1 body mass, 1.02 g fat[middle dot]kg-1, 1.36 g CHO[middle dot]kg-1, 0.31 g protein[middle dot]kg-1) 12 h after the exercise, and measurements of plasma triglyceride (TG) concentration and whole-body resting fat oxidation were made in the fasted condition and during the 4-h postprandial period. Results: The total area under the curve for plasma TG was significantly lower in EX+LCHO (325 (63) mg[middle dot]dL-1 per 4 h) compared with that in EX+HCHO (449 (118) mg[middle dot]dL-1 per 4 h, P = 0.03). Postprandial fat oxidation during this period was significantly greater in EX+LCHO (257 (58) kcal per 4 h, P = 0.003) compared with that in EX+HCHO (209 (56) kcal per 4 h). The change in total postprandial fat oxidation (kcal per 4 h) relative to CON was significantly and inversely correlated with the change in the total TG area under the curve relative to CON (mg[middle dot]dL-1 per 4 h, [DELTA]TG AUC, R2 = 0.37, P = 0.008). Conclusions: The low CHO composition of the postexercise meal contributes to lower PPTG and increased fat oxidation, with lower PPTG related to an increase in fat oxidation.