ALPHA- AND BETA-WAVES SYNCHRONIZATION AS RECORDED BY MEANS OF EEG DURING LOCAL MUSCULAR PERFORMANCE
We have conducted an analysis of bioelectric activity of brain cortexes as recorded by means of EEG when local muscular performance until fatigue sets in. The research has been performed on subjects aged 18 to 25, of which athletes doing acyclic sports formed the study group, unfit subjects formed the control group, and subjects practicing psychophysical self-regulation (PSR) formed the «relaxation group». The analysis of alpha-activity suggests that alpha-waves predominated in the athletes in both occipital and fronto-central areas, in contrast to the control group. It is of interest to note that alpha-activity is as pronounced in the «relaxation group» subjects in the fronto-central areas as it is in the athletes. An increase in the spectral power of the alpha-waves in the fronto-central deflections is detected by a ergograph, which predominates in the brain hemisphere opposite to the performing hand, and is accompanied by an the alpha-waves synchronization. It is noteworthy that the alpha-activity synchronization period during local muscular performance is 15 to 25 % longer in the athletes than in the unfit subjects and that it takes the athletes 15 to 30 s longer than the unfit subjects to perform until fatigue sets in. When the onset of fatigue, all the subjects demonstrate a significant increase in the beta-waves power, accompanied by a refusal to continue the work. Thus, we have obtained new data on the participation of the alpha-activity synchronization processes and the increase in the beta-waves power during local muscular performance.