[Moderate exercise and intake of either high or low glycemic index carbohydrates in sedentary women].

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 (1gr/kg of weight) nor completed the programed exercise. There were n=10 in each group (AW/OB).

INTERVENTION: Two treatments of 55minutes 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±67.2mg/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.