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Effect of diurnal temperature range on cardiovascular markers in the elderly in Seoul, Korea

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Abstract

While diurnal temperature range (DTR) has been found to be a risk factor for mortality, evaluation of the underlying mechanisms involved in this association are lacking. To explain the association between DTR and health effects, we investigated how cardiovascular markers responded to DTR. Data was obtained from 560 participants who regularly attended a community elderly welfare center located in Seoul, Korea. Data collection was conducted a total of five times over a 3-year period beginning in August, 2008. We examined systolic and diastolic blood pressure (BP), heart rate (HR), and heart rate variability (HRV). Mixed-effects models and generalized additive mixed models were used to assess the relationship of DTR with BP, HR, and HRV. BP was not associated significantly with rapid temperature changes during the day. While HR was associated linearly with increments of DTR, the relationship between DTR and HRV showed nonlinear associations, or the presence of a cutoff around median DTR. At the cutoff level of DTR determined by an inflection point in the graph, standard deviation of normal-to-normal intervals (SDNN) and root mean square successive difference (RMSSD) were peaked, whereas the low frequency:high frequency (LF:HF) ratio was elevated with decreasing DTR below the cutoff level. The study demonstrated that HR increases with increasing temperature range during the day, and that HRV is reduced at small or large DTR, which suggests minimal cardiovascular stress around the median level of temperature range during the day.

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Acknowledgments

H. K. and Y.-H. L. were partially supported by Basic Science Research Program (#2010-0009581) and Global Research Lab (#K21004000001-10A0500-00710) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology.

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Authors and Affiliations

  1. Department of Epidemiology and Biostatistics, Graduate School of Public Health, Seoul National University, Seoul, Republic of Korea

    Youn-Hee Lim & Ho Kim

  2. Institute of Health and Environment, Graduate School of Public Health, Seoul National University, Seoul, Republic of Korea

    Youn-Hee Lim

  3. Institute of Environmental Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea

    Jin Hee Kim & Yun-Chul Hong

  4. Environmental Health Center, Seoul National University College of Medicine, Seoul, Republic of Korea

    Sanghyuk Bae

  5. Department of Preventive Medicine, Seoul National University College of Medicine, 103 Daehakro, Jongro-gu, Seoul, 110-799, Republic of Korea

    Yun-Chul Hong

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  1. Youn-Hee Lim
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  2. Ho Kim
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  3. Jin Hee Kim
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  5. Yun-Chul Hong
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Correspondence to Yun-Chul Hong.

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Lim, YH., Kim, H., Kim, J.H. et al. Effect of diurnal temperature range on cardiovascular markers in the elderly in Seoul, Korea. Int J Biometeorol 57, 597–603 (2013). https://doi.org/10.1007/s00484-012-0587-x

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  • DOI: https://doi.org/10.1007/s00484-012-0587-x

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