Peculiarities of the superficial electromyography of horizontal straight muscles in healthy children

Introduction. Today there is no objective method of the extraocular muscles functional state assessing, which could be considered a certainly effective and convenient for wide use in ophthalmic practice. The aim of this study was to determine the parameters of surface electromyography of horizontal muscles (SEMG) in healthy children using the previously developed method. Material and methods. With earlier proposed method of SEMG the surface electromyography of rectus muscles was conducted in 28 (56 eyes) healthy children aged (13,9±SD2,4) y.o. The main parameters of the rectus muscles SEMG were defined: total electrical activity frequency, maximum and average signal amplitude. Results. It is established that the average values of SEMG parameters of action potentials (frequency, amplitude) of the rectus muscles in healthy children do not differ significantly. High frequency of action potentials of SEMG has the larger amplitude signal for lateral muscle, and for medial rectus high frequency SEMG has low amplitude signal. The distribution of the potential parameters of the SEMG on the groups with lower (40? 60 Hz) and higher frequency (>100 Hz) may reflect the presence of single and multi-innervated groups of muscle fibers in the extraocular muscles in healthy children.