Table 2 Description of the protocol of the Graded Activity Group

Aerobic training on the treadmill

5-minute warm-up with speed of 5–8 km/h;

20-minute submaximal training at 70-80% maximum heart rate;

5-minute slow-down with gradual speed reduction.

Lower limbs strengthening

Exercise for the quadriceps in sitting position;

3 sets of 12 repetitions for each limb

Exercise for the hamstrings in standing position.

Intervals between series of 30 seconds

Trunk strengthening

Exercises for the erector spinae in ventral decubitus: trunk extension.

3 sets of 10 repetitions

Intervals between series of 30 seconds