Thus , the establishment of evaluation protocols that provide quantitative data concerning the functional capacity is of utmost importance . From the electromyographic analysis , one can measure the electrical activity of muscle and identify abnormal patterns of response. For the identification of kinematic changes becomes useful equipment capable of recording the speed and angle of movement, as the accelerometer . Another evaluation method applicable to cases of herniated disc and back pain is the force platform to quantify the ground reaction force during the stance phase of the movement . Also , the quality of life should be taken into account as routinely observed psychological impairment involving issues related to vitality, emotional and social aspects , which can be identified through the questionnaire of quality of life ( SF -36 ) .