[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.