Ontogenesis of the nervous, muscular and cardiovascular systems in patients with I-II degree scoliosis. Report III. Dynamics of EMG parameters of the back muscles in patients at the age of 6-18 years with I-II degree scoliosis

The aim of this work was to study the age-related special features of EMG parameters of the back muscles in patients at the age of 6-18 years with I-II degree scoliosis. 26 patients were at the age of 7.5±0.57 years; 39 – at the age of 12.9±0.28 years; 29 – 16.6±0.5 years. The functional condition of lumbar muscles was evaluated by EMG values of m. erector spinae. It has been established the increase of maximal EMG power, that of mean EMG frequency and EMG fast waves/slow waves ratio, as well as the decrease of mean maximal EMG amplitude and m. erector spinae EMG mean power/mean frequency ratio is observed in muscles both to the left and to the right from the spine with age in children with I-II degree scoliosis. A spurt of the change in the parameters mentioned above takes place within the age-related range of 6-10 years and that of 10-14 years. Subsequently, as far as the children tested grow older, the rate of the parameter change becomes slower. It has been established for all age-related groups, that EMG maximal amplitude and EMG mean power/mean frequency ratio is higher, while EMG mean maximal power, EMG mean frequency, EMG fast waves/slow waves ratio in m. erector spinae is lower on the spine right side with respect to the left one in patients with I-II degree scoliosis of the spine.