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Relationship between changes in blood pressure from summer to winter and estimated 24-hour salt excretion using spot urine: the Niigata Wellness Study

Hypertension Research volume 46, pages 226–230 (2023)Cite this article

Abstract

A convenient way to determine salt intake is salt excretion using spot urine (e-NaCl). We measured e-NaCl at health checkups and compared results with seasonal changes in blood pressure. Among 19,732 examinees who underwent health checkups from Aug. 2012 to Mar. 2013, age, body weight and e-NaCl were measured and compared to monthly mean systolic blood pressure (SBP). Excluded were those taking antihypertensive drugs and with creatinine levels higher than 2.0 mg/dL. Also examined was salt intake (i-NaCl) by an interview survey from Aug. to Dec. 2012. Correlations with SBP were R = 0.7718 for age, R = 0.5996 for body weight, R = 0.2498 for i-NaCl and R = 0.9335 for e-NaCl. e-NaCl decreased in summer. It was presumed that the reduced burden on the kidney of salt excretion due to sweating may be related to decreases in blood pressure in summer.

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Acknowledgements

I am a member of the department endowed by the Niigata Association of Occupational Health.

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Authors and Affiliations

  1. Department of Prevention of Noncommunicable Diseases and Promotion of Health Checkup, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuoh-ku, Niigata, 951-8510, Japan

    Kiminori Kato

  2. Niigata Association of Occupational Health, 1185-3 Kitaba, Nisi-ku, Niigata, 950-1187, Japan

    Kiminori Kato, Takashi Kobayashi, Minoru Tahiro, Shigemi Tashiro & Koji Sato

  3. Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, 3-9, Fukuura, Kanzawa-ku, Yokohama, Kanagawa, 236-0004, Japan

    Tomoaki Ishigami

  4. Department of Hematology, Endocrinology and Metabolism, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuoh-ku, Niigata, 951-8510, Japan

    Takaho Yamada, Midori Iwanaga, Satoru Kodama, Kazuya Fujihara & Hirohito Sone

Authors
  1. Kiminori Kato
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  2. Tomoaki Ishigami
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Correspondence to Hirohito Sone.

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Kato, K., Ishigami, T., Kobayashi, T. et al. Relationship between changes in blood pressure from summer to winter and estimated 24-hour salt excretion using spot urine: the Niigata Wellness Study. Hypertens Res 46, 226–230 (2023). https://doi.org/10.1038/s41440-022-01049-1

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