In each volunteer, after a brief questionnaire, it will be measured the center of gravity and the range of movement of the lumbar spine before the technique.

Each volunteer will stay in supine position with arms along their body, in which their legs may be either extended or flexed.

Next, the researcher will perform the intervention protocol in Diaphragm. Then, all the measurements described before, will be repeated by the assessor right after the technique.

In each volunteer, after a brief questionnaire, it will be measured the center of gravity and the range of movement of the lumbar spine before the technique.

Each volunteer will stay in supine position with arms along their body, in which their legs may be either extended or flexed.

Next, the researcher will perform the Sham technique. Then, all the measurements described before, will be repeated by the assessor right after the technique.

The protocol consists of three techniques. The two first techniques will be applied for 10 respiratory cycles.

Muscle Stretching Technique:

the researcher will perform a cephalic traction on the inferior costal border with the ulnar border during the inspiratory phase.

Phrenic-center inhibition technique:

the researcher, with a hand on the sternum to caudal and other hand on the umbilical region to cranial, will approach his hands on the horizontal plane, when the volunteer exales.

Functional diaphragm technique:

the researcher will perform a vertical pressure on the diaphragm for 5 minutes and will search for the facilitated parameters and maintain them until the release of all the periarticular elements.

To obtain the center of gravity measurements, it will be used the system Qualisys Track Manager. First, it will be placed in the subject spheric markers on the spinous processes of T12, L3 and S2 and both anterior and posterior superior iliac spines.

The cameras will be arranged to cover the area to the test, which it will be performed in a hard surface with the help of reflector-markers that will evaluate the movements.

The data will be collected twice, with the eyes open and closed. They'll be standing in the platform for 90 seconds each time and the data will be collected at the 30, 60 and 90 seconds.

The software is going to be used to convert the data in coordinates in the x, y and z axis, which it will allow to analyse the tridimensional kinematics of the lumbar spine Through the intrinsical board of Qualysis Track Manager it will be evaluated the relation of the center of pressure with the vertical projection of the center of mass through the distance between both.

To obtain the center of gravity measurements, it will be used the system Qualisys Track Manager. First, it will be placed in the subject spheric markers on the spinous processes of T12, L3 and S2 and both anterior and posterior superior iliac spines.

The cameras will be arranged to cover the area to the test, which it will be performed in a hard surface with the help of reflector-markers that will evaluate the movements.

The data will be collected by asking the volunteer to perform certain movements such as anterior and lateral flexion.

The software is going to be used to convert the data in coordinates in the x, y and z axis, which it will allow to analyse the tridimensional kinematics of the lumbar spine Through the intrinsical board of Qualysis Track Manager it will be evaluated the relation of the center of pressure with the vertical projection of the center of mass through the distance between both.