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The core interthreshold zone during exposure to red and blue light
BACKGROUND: This study tested the hypothesis that the core interthreshold zone (CIZ) changes during exposure to red or blue light via the non-visual pathway, because it is known that light intensity affects the central nervous system. We conducted a series of human experiments with 5 or 10 male subj...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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BioMed Central
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3686708/ https://www.ncbi.nlm.nih.gov/pubmed/23587209 http://dx.doi.org/10.1186/1880-6805-32-6 |
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author | Kakitsuba, Naoshi Mekjavic, Igor B Katsuura, Tetsuo |
author_facet | Kakitsuba, Naoshi Mekjavic, Igor B Katsuura, Tetsuo |
author_sort | Kakitsuba, Naoshi |
collection | PubMed |
description | BACKGROUND: This study tested the hypothesis that the core interthreshold zone (CIZ) changes during exposure to red or blue light via the non-visual pathway, because it is known that light intensity affects the central nervous system. We conducted a series of human experiments with 5 or 10 male subjects in each experiment. METHODS: The air temperature in the climatic chamber was maintained at 20 to 24°C. The subjects wore suits perfused with 25°C water at a rate of 600 cm(3)/min. They exercised on an ergometer at 50% of their maximum work rate for 10 to 15 minutes until sweating commenced, and then remained continuously seated without exercise until their oxygen uptake increased. The rectal temperature and skin temperatures at four sites were monitored using thermistors. The sweating rate was measured at the forehead with a sweat rate monitor. Oxygen uptake was monitored with a gas analyzer. The subjects were exposed to red or blue light at 500 lx and 1000 lx in both summer and winter. RESULTS: The mean CIZs at 500 lx were 0.23 ± 0.16°C under red light and 0.20 ± 0.10°C under blue light in the summer, and 0.19 ± 0.20°C under red light and 0.26 ± 0.24°C under blue light in the winter. The CIZs at 1000 lx were 0.18 ± 0.14°C under red light and 0.15 ± 0.20°C under blue light in the summer, and 0.52 ± 0.18°C under red light and 0.71 ± 0.28°C under blue light in the winter. A significant difference (P <0.05) was observed in the CIZs between red and blue light at 1000 lx in the winter, and significant seasonal differences under red light (P <0.05) and blue light (P <0.01) were also observed at 1000 lx. CONCLUSIONS: The present study demonstrated that dynamic changes in the physiological effects of colors of light on autonomic functions via the non-visual pathway may be associated with the temperature regulation system. |
format | Online Article Text |
id | pubmed-3686708 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-36867082013-06-25 The core interthreshold zone during exposure to red and blue light Kakitsuba, Naoshi Mekjavic, Igor B Katsuura, Tetsuo J Physiol Anthropol Original Article BACKGROUND: This study tested the hypothesis that the core interthreshold zone (CIZ) changes during exposure to red or blue light via the non-visual pathway, because it is known that light intensity affects the central nervous system. We conducted a series of human experiments with 5 or 10 male subjects in each experiment. METHODS: The air temperature in the climatic chamber was maintained at 20 to 24°C. The subjects wore suits perfused with 25°C water at a rate of 600 cm(3)/min. They exercised on an ergometer at 50% of their maximum work rate for 10 to 15 minutes until sweating commenced, and then remained continuously seated without exercise until their oxygen uptake increased. The rectal temperature and skin temperatures at four sites were monitored using thermistors. The sweating rate was measured at the forehead with a sweat rate monitor. Oxygen uptake was monitored with a gas analyzer. The subjects were exposed to red or blue light at 500 lx and 1000 lx in both summer and winter. RESULTS: The mean CIZs at 500 lx were 0.23 ± 0.16°C under red light and 0.20 ± 0.10°C under blue light in the summer, and 0.19 ± 0.20°C under red light and 0.26 ± 0.24°C under blue light in the winter. The CIZs at 1000 lx were 0.18 ± 0.14°C under red light and 0.15 ± 0.20°C under blue light in the summer, and 0.52 ± 0.18°C under red light and 0.71 ± 0.28°C under blue light in the winter. A significant difference (P <0.05) was observed in the CIZs between red and blue light at 1000 lx in the winter, and significant seasonal differences under red light (P <0.05) and blue light (P <0.01) were also observed at 1000 lx. CONCLUSIONS: The present study demonstrated that dynamic changes in the physiological effects of colors of light on autonomic functions via the non-visual pathway may be associated with the temperature regulation system. BioMed Central 2013-04-12 /pmc/articles/PMC3686708/ /pubmed/23587209 http://dx.doi.org/10.1186/1880-6805-32-6 Text en Copyright © 2013 Kakitsuba et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Article Kakitsuba, Naoshi Mekjavic, Igor B Katsuura, Tetsuo The core interthreshold zone during exposure to red and blue light |
title | The core interthreshold zone during exposure to red and blue light |
title_full | The core interthreshold zone during exposure to red and blue light |
title_fullStr | The core interthreshold zone during exposure to red and blue light |
title_full_unstemmed | The core interthreshold zone during exposure to red and blue light |
title_short | The core interthreshold zone during exposure to red and blue light |
title_sort | core interthreshold zone during exposure to red and blue light |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3686708/ https://www.ncbi.nlm.nih.gov/pubmed/23587209 http://dx.doi.org/10.1186/1880-6805-32-6 |
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