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Seasonal changes of 24-hour intraocular pressure rhythm in healthy Shanghai population

The aim of the present study was to investigate and compare the 24-hour intraocular pressure (IOP) rhythms in winter and summer in the healthy population of Shanghai, China. This is a cross-sectional study in which 24-hour IOP measurements were taken for all eligible healthy volunteers in winter and...

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Autores principales: Cheng, Jingyi, Xiao, Ming, Xu, Huan, Fang, Shaobin, Chen, Xu, Kong, Xiangmei, Sun, Xinghuai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Wolters Kluwer Health 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4979830/
https://www.ncbi.nlm.nih.gov/pubmed/27495076
http://dx.doi.org/10.1097/MD.0000000000004453
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author Cheng, Jingyi
Xiao, Ming
Xu, Huan
Fang, Shaobin
Chen, Xu
Kong, Xiangmei
Sun, Xinghuai
author_facet Cheng, Jingyi
Xiao, Ming
Xu, Huan
Fang, Shaobin
Chen, Xu
Kong, Xiangmei
Sun, Xinghuai
author_sort Cheng, Jingyi
collection PubMed
description The aim of the present study was to investigate and compare the 24-hour intraocular pressure (IOP) rhythms in winter and summer in the healthy population of Shanghai, China. This is a cross-sectional study in which 24-hour IOP measurements were taken for all eligible healthy volunteers in winter and summer, respectively, and the temperature, hours of sunlight (sunlight time), and circulatory parameters, including heart rate, systolic blood pressure, and diastolic blood pressure, were also recorded. The 24-hour IOP curves and IOP parameters (mean, peak, trough, and fluctuation of IOP together with the diurnal-to-nocturnal IOP change) in winter and summer were obtained and compared. The magnitude of IOP changes from summer to winter was also calculated. A total of 29 participants (58 eyes), 14 (48.28%) male and 15 (51.72%) female, aged 43.66 ± 12.20 (19–61) years, were considered eligible for this study. Generally, IOP decreased progressively before noon, increased notably in the nocturnal period, and peaked at 12:00 am in winter and at 2:00 am in summer. The pattern of 24-hour IOP in winter and summer was significantly different (P = 0.002). The average IOPs from 4:00 pm to 8:00 am, except for 6:00 am, were significantly higher in winter (P < 0.05). However, no significant differences were shown after adjusting for temperature and/or sunlight time. From summer to winter, the extent of IOP increase was mostly around 0 to 3 mm Hg, and the IOPs increased more significantly in the nocturnal period than in the diurnal period (P = 0.05). The 24-hour IOP rhythms were different in winter and summer, with higher IOP level in winter. Temperature and sunlight time, which are independent of heart rate and blood pressure, affected the 24-hour IOP rhythms in healthy people in Shanghai, China. Further investigations are expected for the rhythm of some endogenous substance secretion and the inner mechanism of regulation of IOP.
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spelling pubmed-49798302016-08-18 Seasonal changes of 24-hour intraocular pressure rhythm in healthy Shanghai population Cheng, Jingyi Xiao, Ming Xu, Huan Fang, Shaobin Chen, Xu Kong, Xiangmei Sun, Xinghuai Medicine (Baltimore) 5800 The aim of the present study was to investigate and compare the 24-hour intraocular pressure (IOP) rhythms in winter and summer in the healthy population of Shanghai, China. This is a cross-sectional study in which 24-hour IOP measurements were taken for all eligible healthy volunteers in winter and summer, respectively, and the temperature, hours of sunlight (sunlight time), and circulatory parameters, including heart rate, systolic blood pressure, and diastolic blood pressure, were also recorded. The 24-hour IOP curves and IOP parameters (mean, peak, trough, and fluctuation of IOP together with the diurnal-to-nocturnal IOP change) in winter and summer were obtained and compared. The magnitude of IOP changes from summer to winter was also calculated. A total of 29 participants (58 eyes), 14 (48.28%) male and 15 (51.72%) female, aged 43.66 ± 12.20 (19–61) years, were considered eligible for this study. Generally, IOP decreased progressively before noon, increased notably in the nocturnal period, and peaked at 12:00 am in winter and at 2:00 am in summer. The pattern of 24-hour IOP in winter and summer was significantly different (P = 0.002). The average IOPs from 4:00 pm to 8:00 am, except for 6:00 am, were significantly higher in winter (P < 0.05). However, no significant differences were shown after adjusting for temperature and/or sunlight time. From summer to winter, the extent of IOP increase was mostly around 0 to 3 mm Hg, and the IOPs increased more significantly in the nocturnal period than in the diurnal period (P = 0.05). The 24-hour IOP rhythms were different in winter and summer, with higher IOP level in winter. Temperature and sunlight time, which are independent of heart rate and blood pressure, affected the 24-hour IOP rhythms in healthy people in Shanghai, China. Further investigations are expected for the rhythm of some endogenous substance secretion and the inner mechanism of regulation of IOP. Wolters Kluwer Health 2016-08-07 /pmc/articles/PMC4979830/ /pubmed/27495076 http://dx.doi.org/10.1097/MD.0000000000004453 Text en Copyright © 2016 the Author(s). Published by Wolters Kluwer Health, Inc. All rights reserved. http://creativecommons.org/licenses/by-nc-nd/4.0 This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0, where it is permissible to download, share and reproduce the work in any medium, provided it is properly cited. The work cannot be changed in any way or used commercially. http://creativecommons.org/licenses/by-nc-nd/4.0
spellingShingle 5800
Cheng, Jingyi
Xiao, Ming
Xu, Huan
Fang, Shaobin
Chen, Xu
Kong, Xiangmei
Sun, Xinghuai
Seasonal changes of 24-hour intraocular pressure rhythm in healthy Shanghai population
title Seasonal changes of 24-hour intraocular pressure rhythm in healthy Shanghai population
title_full Seasonal changes of 24-hour intraocular pressure rhythm in healthy Shanghai population
title_fullStr Seasonal changes of 24-hour intraocular pressure rhythm in healthy Shanghai population
title_full_unstemmed Seasonal changes of 24-hour intraocular pressure rhythm in healthy Shanghai population
title_short Seasonal changes of 24-hour intraocular pressure rhythm in healthy Shanghai population
title_sort seasonal changes of 24-hour intraocular pressure rhythm in healthy shanghai population
topic 5800
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4979830/
https://www.ncbi.nlm.nih.gov/pubmed/27495076
http://dx.doi.org/10.1097/MD.0000000000004453
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