The total activity level will be evaluated during the
first week by pedometers. Based on this information,
patients will be instructed to increase their activity level
progressively and monitor the amount of daily steps with
the pedometer. (Table 2). Interval walking will be added
to the exercise program four months after the beginning
of the intervention. Each interval exercise consists of 5–
10 minutes warm-up at normal walking speed, followed
by periods of 30s - 1 min of brisk walking and 3 min of
walking at normal speed alternated four times. The total
length of the exercise bout will be 25–30 minutes. The
length and intensity of brisk walking will be gradually
increased during the last eight months.