Body posture is the output of complex interactions between control mechanisms of central nervous systems (visual, vestibular and somatosensory) and the musculo-skeletal actuators acting against the support surface. All these factors can be analyzed thanks to a simple and quick test suitable for the whole population.
The measurement of forces exerted against the ground can be recorded by a force platform during both quiet stance (stabilography) and during dynamic conditions (dynamic posturography). These methods allow to quantitatively measure stability of stance or postural equilibrium, obtaining information about the relative motion of the center of pressure in both antero-poeterior and medio-lateral directions. Such oscillations are related to individual balance capacities and can be trained.
Posturography is useful to quantify postural oscillations with subject in stand up position describing how position is maintained in static and dynamic conditions, discovering strategies of the tonic postural system. Moreover, it is possible to generate a sequence of standardized motions of the support platform in order to alter subject's posture in an orderly and reproducible way. In this case the anticipatory postural adjustments can be investigated.