COMPARISON OF STANDING & SITTING POSITION IN CONSIDERING OF MAXIMUM ISOMETRIC EXTENSION TORQUE OF LUMBAR SPINE IN DIFFERENT LUMBAR FLEXION ANGLES AND ISOSTATION B-200 IN HEALTHY MALES

Today, Isostation B-200 is one of the most familiar for assessing low back muscles function.This study that is a Quasi-Experimental design was done on 30 healthy men (mean age~26.4 years). The aim of this research is to determine the best and worst motor efficiency in standing and sitting position following torque measurement. In this research maximum torque of low back extensor muscles as measured in standing & sitting position & in four different degree of trunk flexion (0, 20, 40, 60). All date was analyzed by statgraphics plus software and concluded that in standing position with increasing of tunk flexion, and after extension of low back torque was increased continously and in sitting position, with increasing of trunk flexion, extension torque increased unitl 40 degree of trunk flexion, then decreased. The most prominent clinical point of this research is using of sufficient position & angle of low back spine in stabilization exercises, that in the early stage of training non specific standing position recommended and in the late & terminal stage specific standing & sitting position preferred.