Method Subjects were divided into group of non-specific low back pain patients and group of healthy adults,after which we measured and recorded surface electromyography(sEMG) signals of both sides\' lumbar muscles when the subjects practicing respectively three different protocols:test of demi-bridge and test of demi-bridge supported by a single leg(pain side and pain free side respectively).

This thesis has put forward the important role that hipbone muscles play in sprint, based on the analysis of the physiological mechanism of hipbone muscles, and pointed out physical strength training of hipbone muscles to improve our sprint.

Objuective To study the correlation among the lumbar flexion mobility,the lumbarextensor strength and modified Oswestry Low Back Questionnaire,and to analyse factors causing disability in low back pain tank soldiers moility.