Effect of glycemic index on energy expenditure and energy substrate utilization before and after exercise on a stationary bicycle

• Autor(a) principal: Guedes COCATE, Paula
• Data de Publicação: 2023
• Outros Autores: Gonçalves ALFENAS, Rita de Cássia, Gonçalves PEREIRA, Letícia, BRESSAN, Josefina, Bouzas MARINS, João Carlos, CECON, Paulo Roberto
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista de Nutrição
• Texto Completo: https://periodicos.puc-campinas.edu.br/nutricao/article/view/9435
• topic: Oxygen consumption; Exercise; Glycemic index; Energy metabolisme; Substrate; Consumo de oxigênio; Exercício físico; Índice glicêmico; Metabolismo energético; Substratos

ObjectiveThe present study assessed, on 5 consecutive days, the effect of consuming meals with different glycemic indices on energy expenditure, energy substrate oxidation and excessive oxygen consumption after exercise. MethodsA total of 15 well trained men aged M=24.4, SD=3.70 years with a mean body mass index of M=21.97, SD=1.46 kg/m2and maximum oxygen uptake (VO2max) of M=70.00, SD= 5.32 mL(kg.min)-1 participated in the study. After the meal, the participants remained 90 minutes in the indirect calorimeter Deltatrac® for assessment of the metabolic parameters. Next, they exercised at 85-95% of their maximum heart rate in three bouts of 10 minutes. The metabolic parameters were reassessed within the 60 minutes following the exercise. ResultsThe study treatments did not affect energy expenditure, excessive oxygen consumption or fat oxidation after exercise. However, the rate of fat oxidation in the 90 minutes that followed the meal was higher in those who consumed the high-glycemic index meal than in those who consumed the low-glycemic index meal. Moreover, the postprandial fat oxidation rate was lower than that observed after the exercise. ConclusionThese results suggest that, while the consumption of low-glycemic index meals may not have beneficial effects, exercise can promote greater fat oxidation and, consequently, reduce body fat.