The stability of the hemispheric difference UPP in the temporal leads under different loads Fd-Fs, Cd-Cs, Pd-Ps, Td-Ts, Od-Os – the inter-hemispheric differences UPP in the frontal, central, parietal, temporal, occipital leads, respectively, it is clear that the stronger the load, the more likely the change in the sign of the hemispheric difference UPP in the temporal leads. At the same time, depending on the impact force and the initial distribution of SCP, the proportion of subjects surveyed with a predominance of SCP in the right or left hemispheres increases and the number of subjects with approximately equal SCP values in both hemispheres decreases.
Let us consider in more detail the dynamics of SCP under various influences.
In rowing athletes after physical exertion with a significant excess of the aerobic exchange threshold, the sign of the difference in UPP in the temporal leads remained only in 41% of cases. At the same time, there was no significant shift in the difference between the SCP. After the load, the number of athletes with a predominance of UPP in the left hemisphere increased.
The proportion of the surveyed with a predominance of UPP in the left (Td <Ts) and right (Td> Ts) hemisphere or without predominance (Td ~ Ts) in the control group of healthy people and athletes before and after heavy physical training
As normal, subjects with higher SCP values in the left hemisphere than in the right prevail. In athletes, on the contrary, SCP is more often higher in the right hemisphere than in the left. Under the influence of the load in the group of athletes, the proportion of subjects surveyed decreases with a predominance of activity in the right hemisphere and the number of people with higher SCP values in the left hemisphere increases.
In principle, the same pattern occurs in athletes. After increased training load in women rowers, the sign of the difference in UCP between the temporal leads remained in 61% of female athletes, and there was no significant shift in the difference in UCP. After the load also increased the number of athletes with a predominance of UPP in the left hemisphere.
The proportions of the subjects with a predominance of SCP in the left (Td <Ts), right (Td> Ts) hemispheres or without prevalence (Td ~ Ts) in the control group of healthy women and athletes before and after heavy physical training .
It is characteristic that in athletes, both men and women, the direction of the changes in the hemispheric difference SCP under the influence of the load is similar to that which occurs in the norm. This is understandable, since the background values and the UPP increment under the influence of the load are related to each other by negative correlation. This is especially evident in male athletes, in whom the value of the inter-hemispheric difference of SCP before the load and the increase in the inter-hemispheric difference of SCP are associated with a strong correlation dependence ( r = -0.82; p <0.001)
With moderate exertion in athletes, the sign of the difference in UPP in the temporal leads remained in 82% of cases. The difference between SCP in the central leads is equally stable, but in other areas its stability is significantly lower: in the frontal – 55%, in the parietal – 45%, in the occipital – 73% of cases. Thus, the most stable hemispheric asymmetry in the temporal and central leads.
The greater the initial difference of the UPP in absolute value, the greater the shift of this difference, directed towards its average value. If we calculate the average value of the hemispheric difference of the SCP in different samples, then significant changes in the average values are not often observed, however, the variance of this difference after various influences almost always decreases significantly. In addition, as a rule, under the influence of the load, the number of subjects in whom the hemispheric difference of the SCP was close to zero is reduced to within 1 mV. Based on the above theoretical ideas about the organization of the FMA and experimental data, it can be concluded that the normal activity of both sexes is normal. globes is not a steady state. Under load, inversion of the initial hemispheric difference SCP often occurs.
As already mentioned, one type of standard functional load is a three-minute hyperventilation test. In the subjects of middle age (up to 45 years), the sign of the difference in UPP in temporal leads remained in 56% of cases. The same subjects who received the Semax preparation, which increases the adaptive capacity of the brain, retained the unchanged sign of interhemispheric potential difference in 64% of cases.
The correlation between the change in the hemispheric difference of UPP during hyperventilation and its initial value was normally r = -0.65; p <0.009.
With age, the lability of PMA under load appears to be decreasing. Elderly subjects (57.9 + 1.8 years) after hyperventilation retained a constant sign of the hemispheric difference UPP in 69% of cases. The number of subjects with a positive potential difference after loading increased slightly. However, before and after hyperventilation, the hemispheric potential difference was not significantly different from zero, which is typical for this age.