Ejercicio moderado y consumo de alimentos de alto y bajo índice glucémico en mujeres sedentarias

OBJECTIVE: To analyze changes in blood glucose, insulin and triglyceride concentrations in relation to a moderate aerobic exercise in sedentary women of different body weight, exposed to either a high or low glycemic index carbohydrates diet. DISEÑO: Cross-over type. SITE: Research was performed in the Exercise Physiology Laboratory at Facultad de Ciencias de la Cultura Física, Universidad Autónoma de Chihuahua, México. PARTICIPANTS: Twenty-six young sedentary women who did not exercise in the last year participated in the study. Four of adequate weight (AW) and 2 with obesity (OB) were excluded for not consuming the suggested carbohydrates (1 gr/kg of weight) nor completed the programed exercise. There were n = 10 in each group (AW/OB). INTERVENTION: Two treatments of 55 minutes of aerobic exercise each were applied one day after consuming either high or low glycemic index carbohydrates. MAIN MEASUREMENTS: Plasmatic glucose, insulin, and triglycerides were determined before and after the scheduled exercise. RESULTS: Glucose, insulin, and triglycerides were higher in OB than in AW at baseline. Glucose was normalized in OB from 5.8 ± 0.35 to 5.3 ± 0.23 mmol/L (P = .001), only by eating foods with low glycemic index; triglycerides increased from 139.5 ± 66.0 to 150.8 ± 67.2 mg/dl (P = .004) at the end of the exercise, after consumption of low glycemic index carbohydrates. CONCLUSION: Elevation of triglycerides secondary to exercise after consumption of low glycemic index seems to indicate an increase of lipid oxidation in OB.