Daytime cold exposure and salt intake based on nocturnal urinary sodium excretion: A cross-sectional analysis of the HEIJO-KYO study

PHYSIOLOGY & BEHAVIOR

卷:152

Article

Saeki, Keigo¹  Obayashi, Kenji¹  Tone, Nobuhiro²  Kurumatani, Norio¹ 

[1] Nara Med Univ, Sch Med, Dept Community Hlth & Epidemiol, Nara, Japan

[2] Nara Med Univ, Sch Med, Ctr Acad Ind & Govt Relat, Nara, Japan

关键词: Cold exposure;    Indoor temperature;    Outdoor temperature;    Nocturnal urinary sodium excretion rate;    Ambulatory blood pressure monitoring;   

DOI  :  10.1016/j.physbeh.2015.10.015

来源: Elsevier

【 摘 要 】

Increased cardiovascular incidence in winter is partly explained by higher blood pressure due to cold exposure. Although higher salt intake induced by cold exposure has been reported in mice, the association remains unclear in humans. To investigate the association between salt intake and cold exposure in winter, a cross-sectional study was conducted among 860 elderly subjects (mean +/- standard deviation: 72.0 +/- 7.1 years). We determined ambient temperature at every 10 min according to indoor temperature measured in the subjects' home, outdoor temperature, and self-administered diary logging time spent outdoors. Salt intake was estimated by nocturnal sodium excretion rate of overnight urine collection. Al degrees C lower daytime ambient temperature was significantly associated with a higher urinary sodium excretion rate by 0.07 mmol/h in the subsequent night independent of age, sex, body weight, alcohol intake, calcium channel blocker use, diabetes, household income, estimated glomerular filtration rate, daytime physical activity (p = 0.02). After further adjustment for outdoor temperature and day length, the lowest tertile groups of ambient daytime temperature (10.1 +/- 2.3 degrees C) showed the nocturnal urinary sodium excretion rate was higher by 14.2% (7.62 vs. 6.54 rftmol/h) compared with the highest tertile group (193 1.8 degrees C). Higher sodium excretion rate was associated with higher nighttime ambulatory blood pressure (p <0.01) and its lower nocturnal dipping (p <0.01). Significant association between higher salt intake and daytime cold exposure partly explain the mechanism of higher blood pressure in winter, and suggest that a reduction of cold exposure might be effective to decrease salt intake. (C) 2015 Elsevier Inc All rights reserved.

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