Method for relaxant effect of optical emission generated by light-emitting-diode source on functional status

FIELD: chemistry.

SUBSTANCE: invention refers to medicine, and may be used for changing the functional status of an individual. The individual's open eyes are exposed to white light at colour temperature 1700 °K or 10000 °K, at lighting intensity 200 lx at the eye level. That is followed by electroencephalogram recording and spectral analysis. If an alpha wave spectral power increases by more than 50%, while a teta wave spectral power increases by more than 25% of a baseline value, the effect is considered to be relaxant.

EFFECT: method enables assessing the action of colour temperature individually that can cause the relaxant effect on an individual.

2 tbl, 2 ex

 

The invention relates to medicine and can be used to provide a relaxing effect on the functional state of the person by light radiation from the led source.

Currently, there is a wide spread of new light sources based on light-emitting diodes. Such semiconductor light sources have not only incredibly powerful, but if they are built on the principle of RGB mixing) and the ability to vary the quality (color, range), quantitative (intensity) and modulation (frequency of outbreaks) light parameters for a given algorithm. This quality is called "intellectual light".

The closest in technical essence and the achieved result is a way to determine the impact on the functional state of a human light radiation (RU, patent No. 2217182. CL A61N 5/06. 2001).

The disadvantages of this method is the impossibility of providing a relaxing effect on the functional state of the person by light radiation.

The technical result, which directed the present invention, is the ability to provide a relaxing effect on the functional state of the person by light radiation from the led source.

Specified those who practical result is achieved by a method of providing a relaxing effect on the functional state of the person by light radiation from the led light source according to the invention the influence of white light with a color temperature of 1700 K and 10000 K carry out on the open eyes of the person, record the electroencephalogram, conduct its spectral analysis and increase the spectral power of the alpha rhythm by more than 50% of theta rhythm by more than 25% of the background values assess the impact of relaxing.

Conducted investigation of effects on the functional state of the human brain dynamically managed ("intellectual") of light from a semiconductor source with a color temperature varied in the range from warm 1700 K to cold 10000 K shades of white light.

Spectral analysis of EEG allowed to objectively evaluate changes in the basic rhythms of electrical activity in the brain when exposed to light with variable color temperature.

In the course of the study tested the prototype led mining light source controlled with the help of special software. The luminous flux of the light source depending on the color temperature was 1000-4000 LM. Color temperature of white light had changed and the mouth is establishing a range from warm 1700 K to cold 10000 K shades of white light. The color rendering index for these color temperatures lying in the range of 80-90.

During the exposure of white light with various color temperatures were recorded electrical brain activity of the subject.

The EEG recording was performed with an electroencephalograph "Telepathy-D" (, St. Petersburg) monopolar method according to the international system "10-20" points Fp1, Fp2, F3, F4, C3, C4, P3, P4, O1, O2, F7, F8, T3, T4, T5 and T6 by the indifferent electrodes placed on the earlobes. The sampling rate of the signals was 250 Hz, the bandwidth of the high frequency of 35 Hz, the time constant of 0.3 C.

As a control condition was used EEG with the eyes open. Next subject, remaining with open eyes, were subjected to sequential exposure to a variety of lighting options, different preset color temperature of the led source. The duration of recording in the background and samples with different illumination corresponded to 2 min in each case, the intervals between exposures of light also had a duration of 2 minutes

The study obtained data was carried out visually and by means of spectral analysis. Determined values of the spectral power of alpha, theta, Delta and beta rhythms in all recorded areas of the cerebral cortex at all stages referred to the registration of brain activity. Spectral analysis was carried out using electroencephalographic program WinEEG Version 1.3". Epoch analysis in the calculation of the spectra was 4 C. the Average spectral indices were calculated for the entire duration of recording in the background and EEG during exposure to light samples.

When statistical processing of obtained results was calculated the average values of the analyzed characteristics, their standard deviation, standard error of the mean. Determination of the degree of reliability of the differences between averages were performed in the statistical software package Statistica 6" at the level of p<0.05 using Wilcoxon criterion.

Visual analysis of EEG dynamics during expositions of white light with variable color temperature showed the presence of mixed reactions in the group examined in the light from the led source. In some cases there was a visible increase in the representation of the alpha rhythm and the strengthening of its regularity, which corresponds to an increase in the stability of the overall functional state of the brain. On the basis of the described type reaction was allocated a group of 10 people (3 women and 7 men) with preferential amplification of the alpha rhythm.

Spectral analysis of EEG allowed to objectively evaluate changes in the basic rhythms of electrical activity grown the th brain when exposed to light with variable color temperature. The group was characterized by a distinct increase in spectral power of alpha rhythm in the exposure light from 1700 K (p<0.05 in O1) and 10000 K (p<0.05 in Fp2, F4, P3, P4, O1, O2, T4, T6). In the latter case, these dynamics are captured more areas of the cortex. A small but significant increase in the power of theta rhythm was in F7 and T4 when light from 1700 K and F3, O1, F7, T4 10000 K (p<0.05). Under illumination with 3800 K 4800 K, 7000 K, the spectra in the range of alpha, theta and Delta rhythms were not significantly changed. Spectral characteristics of beta-rhythm remained unchanged in all samples.

The General character of the changes in EEG in subjects from the selected group shows relaxing exposed to light. It is known that increasing the severity of the alpha rhythm, also accompanied by increased slow activity, associated with a decrease in the level of activation in the brain, which contributes to a more proper rest and helps sleep.

Method of providing a relaxing effect on the functional state of the person by light radiation from the led light source is illustrated by examples.

Example 1.

Test T-VA, 35.

Were recorded EEG during eyes open as in a state of passive wakefulness, and when exposed to white light from an led source with a color temperature of 10000 K. littelest exposure 120 C. Calculated spectral power of alpha and theta rhythms.

The level of changes in the spectral power of EEG rhythms when exposed to light with respect to the initial state are given in Table. 1. All derivations level spectral power of the alpha rhythm has increased by more than 50%. In the vast majority of leads, except P4, the spectral power of theta rhythm has increased by more than 25%. Thus, the light with a color temperature of 10000 K increases the spectral power of alpha and theta rhythms, indicating a lower level of activation of the cerebral cortex. In General, the surveyed T-howling white light with 10000 K is relaxing.

tr> td align="center"> 2,68
Table 1
Changes in the spectral power of alpha and theta rhythms tested T-howl when exposed to light with a color temperature of 10000 K
Leadα-rhythmθ-rhythm% change
BackgroundLightBackgroundLightα-rhythmθ-rhythm
Fp12,706,101,896,98125,84268,73
Fp2was 2.765,941,817,29115,30303,43
F3of 3.469,35to 2.575,49170,23113,29
F43,438,713,024,85154,0160,60
C32,929,952,133,92240,4083,95
C4to 2.57scored 8.382,283,24226,4542,29
P39,101,923,53239,6883,47
P42,366,532,122,41177,2813,95
011,985,031,473,02153,78104,88
021,533,181,492,05108,3937,68
F72,625,621,88of 5.92114,67214,23
F82,234,231,687,1389,69325,67
T32,387,1 1,372,42207,0176,38
T41,955,141,362,34163,1871,81
T51,564,900,822,11213,70156,38
T62,104,141,382,0297,2446,59

Example 2.

The test In s, 29 years.

Were recorded EEG during eyes open as in a state of passive wakefulness, and when exposed to white light from an led source with a color temperature of 1700 K. the exposure time of 120 C. was Calculated spectral power of alpha and theta rhythms.

The level of changes in the spectral power of EEG rhythms when exposed to light with respect to the initial state are given in Table. 2. In all derivations except Fp2, the spectral power of the alpha rhythm has increased by more than 50%. In resp is the data C3, P3, P4, O1, O2, T3, T4 spectral power of theta rhythm has increased by more than 25%, the remaining leads of theta rhythm has not exceeded this level. Given the combination of factors such as the growth of the power of the alpha rhythm throughout the cortex and increase in the power of theta rhythm in terms of derivations, we can talk about reducing the level of activation of the cerebral cortex in response to light exposure with a color temperature of 1700 K, more pronounced in the parietal-occipital and srednevysokikh areas. In General, the survey Had on white light from 1700 K is relaxing.

of 3.64
Table 2
Changes in the spectral power of alpha and theta rhythms of the test At th when exposed to light with a color temperature of 1700 K
Leadα-rhythmθ-rhythm% change
BackgroundLightBackgroundLightα-rhythmθ-rhythm
Fp17,0813,694,2193,36-13,54
Fp2a total of 8.74to 12.52of 5.054,1043,25-18,81

F3of 7.2314,103,333,4395,023,00
F47,66br12.623,72as 4.0264,75of 8.06
C39,6521,442,192,95122,1834,70
C47,1616,4to 2.673,2529,0521,72
P39,3629,222,10 3,35212,1859,52
P47,30received 19.822,34of 3.46171,5147,86
O18,6234,511,87of 3.56300,3590,37
O28,7525,452,033,99190,8696,55
F7as 4.026,171,85to 1.8653,480,54
F84,177,681,76to 2.0684,1717,05
T3to 5.9311,511,171,5394,0 30,77
T43,327,111,151,82114,1658,26
T55,5015,18of 1.341,58176,0017,91
T63,437,461,101,29117,4917,27

Spectral analysis of EEG allowed to objectively evaluate changes in the basic rhythms of electrical activity in the brain when exposed to light with variable color temperature.

Based on the obtained data we can conclude that when the exposure of white light with a color temperature of 1700 K and 10000 K spectral analysis of the electroencephalogram showed that with increasing spectral power of the alpha rhythm by more than 50%, and theta rhythm by more than 25% of the background values, we can conclude that light exposure reduces the level of activation of the cerebral cortex and is relaxing.

Offer the config method allows for individual selection of the color temperature of 1700 K and 10000 K, providing a relaxing influence on the functional state of the person when exposed to light radiation from the led source.

Method of providing a relaxing effect on the functional state of the human light emission from an led source, characterized in that the exposure to white light with a color temperature of 1700 K 10000 K exercise to open the eyes of the person registering the electroencephalogram, conduct its spectral analysis and increase the spectral power of the alpha rhythm by more than 50% of theta rhythm by more than 25% of the background values assess the impact of relaxing.



 

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6 tbl, 3 ex

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EFFECT: higher accuracy of diagnostics.

5 dwg, 1 ex, 1 tbl

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