This paper considers methods for the analysis of non-stationary processes – the wavelet transform and the Hilbert-Huang transform. A comparative analysis of the results of time-frequency analysis of the human pulse signal using these methods has been carried out. The wavelet image and the Hilbert spectrum of instantaneous frequencies are presented here. It is shown that the obtained results are in good agreement with each other. The Hilbert-Huang transform allows for a more accurate assessment of the dynamics of changes in the spectral components of the signal over time.
A change in the frequency spectrum of a person's pulse under the influence of light of different wavelengths has been established. It has been shown that in the light stimulation phase, different colors cause functional changes in the internal organs in the subjects. At the same time, the effects of the photostimulus on the internal organs are not equivalent and depend on the initial functional state and the typology of the subject. Depending on the type of exposure, the same photostimulus can cause contrasting changes in the frequency parameters of pulse signals recorded on the radial arteries of human wrists.
Using the Automated pulse diagnostic system (APDS), the possibility of a quantitative assessment of correcting the functional state of a human organism by the method of spectral analysis of pulse waves (while the subject is exposed to light of different wavelengths) has been revealed. It has been shown that photostimuli have unequal effects on the internal organs, which depends on the functional state of the subject. At the same time, the extreme phtostimuli (blue and red) provide either toning, or relaxing effect on the psychophysiological state of the subject. The contrast effect of light on the human body is one of the promising technologies for managing the functional psychophysiological state.
The paper presents the results of quantitative studies of the heart rate variability detected when the subject was exposed to the preferred light stimulus with a wavelength of 460 nm (blue color). The use of the variational pulsometry method showed the possibility of assessing the state of homeostasis, the interaction of sympathetic and parasympathetic regulation circuits. In the course of the experiment, the activity of various links of the regulatory mechanism was assessed and a general picture of the adaptive response of the organism to the preferred blue light was revealed.
The paper presents the results of experimental studies of optical radiation impact of three colors (yellow, green and blue) on the functional state of human internal organs using the method of energy coefficient. It has been shown by quantitative assessment that a biological response of the body is not determined by the properties that are common to all the waves of the visible range, but it depends on the wavelength of optical radiation. Short-term exposure to optical radiation of the visible range does not lead to any significant and stable changes in the functioning of internal organs. The results of the research can be used to develop technologies for managing the mental and physiological state of a person.
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.
The paper shows the quantitative estimation of the electromagnetic optical radiation influence on the functional state of a human organism by analyzing pulse signals. It has been established that under the influence of the color preferred by the test subject, in comparison with its initial values, the absolute value of the Power Coefficient rises; the variability of the Hilbert-Huang characteristics rises; the analysis of the heart rate indicates the improvement of the functional state of an organism. Under the influence of a rejected color, the characteristics of a pulse wave indicate a decline in the functional state of an organism.
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