5. Evaluation of daily physical activity. It will be made using a Sense Wear accelerometer (Body Media), that it will be placed on the no dominant arm for 7 consecutive days. The physical activity level (PAL) will be recorded. Depending on this parameter, the subjects will be classified as very sedentary (PAL <1.40), sedentary (PAL 1.40 to 1.69) or moderately active (PAL> 1.70). The mean of steps per day, minutes per day of moderate to high intensity (>3 METs) and daily energy expenditure >3 METs will be also determined.