Artificial light apparatus and its use for influencing a condition in a subject

a technology of artificial light and condition, which is applied in the field of artificial light system and a method for influencing a condition in a subject, can solve the problems of reducing vigilance, reducing productivity, and increasing work-related incidents, and affecting the modulation of scn activity and biological rhythms thereby controlled

Inactive Publication Date: 2010-08-26
UNIV LAVAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0037]According to an alternate embodiment of the present invention, a method for modulating a condition in a subject is provided. The method comprises exposing the subject to a first light having a wavelength below 540 nm for a predetermined period of time, where the first light is pulsed so as to avoid a stroboscopic effect thereof and exposing the subject to a second light having a wavelength of a

Problems solved by technology

Modulation of the SCN activity and biological rhythms controlled thereby tend to be problematic where a subject's activities are not synchronized with the natural light and dark cycle.
As such, the desynchronisation of work-related activities and natural light and dark cycle is associated with a decrease in vigilance, a decrease in productivity and an increase of work-related incidents.
Because the individual can perceive the alternation of light flashes and light interruptions, refer to as the stroboscopic effect, the method taught in the U.S. Pat. No. 6,623,512 may lead to discomfort, especially when the subject is exposed to such light conditions for an extended period of time.
Further, because the methods and apparatuses taught in both previous patents make use of a generally white light (i.e. a blend of all colors in the spectrum of vi

Method used

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  • Artificial light apparatus and its use for influencing a condition in a subject
  • Artificial light apparatus and its use for influencing a condition in a subject
  • Artificial light apparatus and its use for influencing a condition in a subject

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0095]Circadian rhythms in body temperature, heart beat and arterial pressure have been demonstrated. Body temperature has been reported to influence human performance, vigilance and alertness, which are reported to be better when body temperature is high and inferior when body temperature is low.

Material and Method

[0096]Subject—The experiments were conducted on a 40-year old Caucasian male. The subject was generally healthy and did not report health condition generally associated with circadian rhythms disorders. The subject also maintained a regular sleep schedule over the two weeks of evaluation.

[0097]Light exposure—Twenty (20) minutes prior to each experiment, two (2) drops of tropicamide 1% (Mydriacyl®) were applied in each eye of the subject, to fully dilate pupils and avoid variation of pupils dilatation during experiments. The subject was comfortably seated in a reclining chair for the total duration of each experiment. Light stimulations were administered with a ganzfeld (C...

example 2

[0101]Melatonin is a good marker of the SCN response to light since suppression of melatonin secretion is correlated to the response of SCN to light stimuli. Accordingly, a strong suppression of melatonin secretion is an indicator of a strong response of SCN to a light stimulus. Further, because melatonin is secreted in saliva and can be monitored relatively easily by ELISA, the use of this hormone as indicator of SCN activity is convenient.

[0102]In this example, four (4) different light conditions were tested on a same subject over 4 weeks, each experiment being spaced from one another by one week, to assess the effect of such light conditions on melatonin secretion.

Material and Method

[0103]Subject—The experiments were conducted on a 60-year old Caucasian male. The subject was generally healthy and did not report health condition generally associated with circadian rhythms disorders. The subject also maintained a regular sleep schedule over the four weeks of evaluation.

[0104]Light ...

example 3

[0112]To assess the efficacy of the light system of the present invention, a light system generally corresponding to the light system 200 was tested by night-shift workers of a saw mill based in the province of Québec, Canada.

Material and Method

[0113]Subjects—The experiments were conducted over three (3) weeks (i.e. week 1 to week 3) in a saw mill based in the province of Quebec, Canada. One different team of graders was assigned to the night shift for each of the three experiment weeks, where each team comprised 4 graders. For each team of workers, the graders were distributed into two (2) experimental groups, namely two (2) graders in the Control Group and two (2) graders in the Subject Group. As such, the experiments were conducted on a total of six (6) different graders of the Control Group and six (6) different graders of the Subject Group. The graders were generally healthy and did not report health condition generally associated with circadian rhythms disorders.

[0114]The grad...

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Abstract

The present invention relates to an artificial light system for modulating circadian rhythms, increasing vigilance and influencing light-associated psychological conditions such as seasonal affective disorder. The system of the invention comprises a source of a green and/or red light and a source of blue light both light sources being controlled by a computer to provide predetermined light conditions. More specifically, the computer is programmed to provide pulses of blue light and continuous or pulsed red light, to enhance the efficacy of blue light, reduce blue-light hazard and avoid stroboscopic effect.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an artificial light system and a method for influencing a condition in a subject. More particularly, this invention relates to a system and a method for influencing circadian rhythms, increasing vigilance and treating psychological conditions that make use of pulsed blue light to enhance the response of a subject's biological clock, minimize blue light hazard and avoid a stroboscopic effect during light exposure.BACKGROUND OF THE INVENTION[0002]Suprachiasmatic nuclei (SCN) constitute the parts of the hypothalamus that are involved in the control of more than 150 daily biological cycles, including cortisol and melatonin secretion, appetite, body temperature, vigilance and sleep rhythms.[0003]Synchronization of suprachiasmatic nuclei with the 24-hour cycle generated by the earth's rotation is modulated by the alternating exposure to light and darkness. The response of SCN to light conditions is attributable to the presence o...

Claims

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Application Information

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IPC IPC(8): A61N5/06
CPCA61M21/00A61M2021/0044A61M2209/088A61N2005/0662A61N2005/0642A61N2005/0648A61N2005/0652A61N5/0618A61M2021/0083A61N2005/0626
Inventor HEBERT, MARCLAFLEUR, LOUIS
Owner UNIV LAVAL
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