The article presents the results of experimental studies of heart rate variability obtained by the exposure of the subject to the preferred color stimulus — optical radiation with a wavelength of 530 nm (green). The use of the method of variational pulsometry has demonstrated the possibility of assessing the state of autonomic homeostasis, the interaction of sympathetic and parasympathetic regulation circuits. In the course of the experiment, the degree of activity of various links of the regulatory mechanism has been assessed and the general picture of the adaptive response of the body to light has been revealed.
Some features of the frequency spectrum of the human pulse dynamics were revealed when the subject was exposed to light of different wavelengths. It has been shown that in the phase of stimulation by light, in contrast to the initial state, preferred or rejected colors cause contrasting changes in the functional state of the internal organs, either stimulating or relaxing them. The dependence of the photostimuli effect on the state and typology of the examined subjects have been detected. The obtained results can be useful for the development of technologies for managing the psychophysiological state of people.
The paper shows possibilities of wavelet coherence methods for estimat ion of the optical electromagnetic radiatio n influence on biomedical signals, which characterizes the functional state of the human heart. An analysis of the wavelet coherence coefficients between pulse signals in the dark and ones under the influence of the preferred color light shows that there is a good correlation between the wavelet spectra at low frequencies and a partial correlat ion at frequencies close to the basic heart rate. Under the influence of the rejected color light, there is a good correlation of the wavelet spectra at frequencies close to the fundamental pulse rate, but there is no correlation at low frequencies.
The paper shows a possibility of quantitative assessment of the functional state of the human regulatory systems by the parameters of pulse signals and the heart rate variability obtained under the influence of optical radiation of different wavelengths. Contrasting photostimuli have been used in the experimental pulse measurements in order to observe the response of the organism to the impact of the optical stimuli. The psychophysical and the physiological state of the subjects who took part in the experiment showed definite changes under the influence optical stimuli, which means that pulsations are very sensitive towards various stimuli, among which optical stimuli are very important. Contrasting stimuli were chosen for the experimental measurements, actually red and blue, because these colors refer to the opposite parts of the optical spectrum and the difference of the influence of contrasting colors on the organism is very prominent. The tests confirmed that the influence of light belongs to promising technologies for psychophysical and physiological control of a human organism.
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