Table 1 Description of the protocol of the Supervised Exercise Group

Stretching

Stretching of the erector spinae in dorsal decubitus, with flexed hips and knees;

3 sets of 30 seconds

Stretching of the hamstrings and triceps surae in dorsal decubitus, with forced flexion of 1 limb at a time with assistance of the physical therapist;

Stretching of the erector spinae with the patient sitting on heels, flexed trunk with the abdomen resting on the front of the thighs;

Intervals between series of 30 seconds

Global stretching of the posterior muscular chain (erector spinae, hamstring, triceps surae.) 2 series of 4 minutes were performed, with 1 minute of resting interval.

Strengthening

Exercises for the rectus abdominis in dorsal decubitus with flexed knees: trunk flexion;

2 sets of 12 repetitions

Exercises for the rectus abdominis, external and internal obliquus in dorsal decubitus and flexed knees: trunk flexion and rotation;

Exercises for the rectus abdominis in dorsal decubitus and semi-flexed knees: hip flexion;

Intervals between series of 30 seconds

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

Motor control

Exercises for the lumbar multifidus in ventral decubitus;

2 sets of 10 repetitions

Exercises for the transversus abdominis muscle in dorsal decubitus with flexed knees;

Exercises for the transversus abdominis muscle in 4 point kneeling;

Intervals between series of 30 seconds

Co-contraction of the transversus abdominis muscle and lumbar multifidus in the upright position.