International Journal of Biometeorology

, Volume 59, Issue 8, pp 1035–1043 | Cite as

Effects of cold and hot temperature on dehydration: a mechanism of cardiovascular burden

  • Youn-Hee Lim
  • Min-Seon Park
  • Yoonhee Kim
  • Ho Kim
  • Yun-Chul Hong
Original Paper
First Online:
Received:
Revised:
Accepted:

Abstract

The association between temperature (cold or heat) and cardiovascular mortality has been well documented. However, few studies have investigated the underlying mechanism of the cold or heat effect. The main goal of this study was to examine the effect of temperature on dehydration markers and to explain the pathophysiological disturbances caused by changes of temperature. We investigated the relationship between outdoor temperature and dehydration markers (blood urea nitrogen (BUN)/creatinine ratio, urine specific gravity, plasma tonicity and haematocrit) in 43,549 adults from Seoul, South Korea, during 1995–2008. We used piece-wise linear regression to find the flexion point of apparent temperature and estimate the effects below or above the apparent temperature. Levels of dehydration markers decreased linearly with an increase in the apparent temperature until a point between 22 and 27 °C, which was regarded as the flexion point of apparent temperature, and then increased with apparent temperature. Because the associations between temperature and cardiovascular mortality are known to be U-shaped, our findings suggest that temperature-related changes in hydration status underlie the increased cardiovascular mortality and morbidity during high- or low-temperature conditions.

Keywords

Apparent temperature Biomarkers Dehydration Piece-wise linear regression Weather 
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Notes

Acknowledgments

The study was supported by the Women Scientist Research Program (no. 2012R1A1A3005549) and Global Research Lab (no. K21004000001-10A0500-00710) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning.

Conflict of interest

None.

Supplementary material

484_2014_917_MOESM1_ESM.docx (107 kb)
ESM 1 (DOCX 107 kb)

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Copyright information

© ISB 2014

Authors and Affiliations

  • Youn-Hee Lim
    • 1
    • 2
  • Min-Seon Park
    • 3
  • Yoonhee Kim
    • 4
  • Ho Kim
    • 4
    • 5
  • Yun-Chul Hong
    • 1
    • 6
  1. 1.Institute of Environmental MedicineSeoul National University Medical Research CenterSeoulRepublic of Korea
  2. 2.Environmental Health Center, College of MedicineSeoul National UniversitySeoulRepublic of Korea
  3. 3.Department of Family MedicineSeoul National University HospitalSeoulRepublic of Korea
  4. 4.Department of Biostatistics and Epidemiology, School of Public HealthSeoul National UniversitySeoulRepublic of Korea
  5. 5.Institute of Health and EnvironmentSeoul National UniversitySeoulRepublic of Korea
  6. 6.Institute of Medical ResearchSeoul National University Bundang HospitalSeongnamRepublic of Korea

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