title: [Changes in 24-hour urinary excretion of sodium and potassium in a community-based heath education program on salt reduction].
abstract: OBJECTIVE
  To examine changes in urinary excretion of sodium, potassium and sodium/potassium ratio in a community-based health education program on salt reduction.
  
  
  METHODS
  The surveyed community was Kyowa town (census population in 1985 = 16,792) where we have conducted a community-based blood pressure control program since 1981 and health education on reduction of salt intake since 1983 for primary prevention of hypertension. A 24-hour urine collection was conducted for systematically selected samples of the participants aged 40-69 in cardiovascular risk surveys in 1982-86 (early period) and in 1990-94 (later period) to estimate changes in urine excretion of sodium, potassium, and sodium/potassium ratio.
  
  
  RESULTS
  A 24-hour urine collection was available for 565 persons (410 men and 155 women) in 1982-86 and 1,461 persons (571 men and 890 women) in 1990-94. A decline in mean sodium excretion was larger in ages 40-49 than in other age groups, and for ages 40-69 combined, the decline was 0.9-1.1 g per day for men and women. Mean sodium excretion declined to 10 g or less per day for men and women aged 60-69. Mean potassium excretion did not change except for men aged 60-69 with an increase in potassium. Sodium/potassium ratio tended to decline for women aged 40-49, and declined significantly for other sex-age groups. A larger reduction in sodium excretion was seen among persons with a history of hypertension compared to those without it.
  
  
  CONCLUSIONS
  A significant reduction in urinary excretion of sodium and sodium/potassium ratio was observed in a community-based health education program. Men and women aged 60-69 reached a recommended level of 10 g or less in sodium intake.
authors.affiliation: Institute of Community Medicine, University of Tsukuba.
authors.forename: H
authors.initials: H
authors.lastname: Iso
authors.forename: T
authors.initials: T
authors.lastname: Shimamoto
authors.forename: K
authors.initials: K
authors.lastname: Yokota
authors.forename: M
authors.initials: M
authors.lastname: Ohki
authors.forename: T
authors.initials: T
authors.lastname: Sankai
authors.forename: M
authors.initials: M
authors.lastname: Kudo
authors.forename: M
authors.initials: M
authors.lastname: Harada
authors.forename: Y
authors.initials: Y
authors.lastname: Wakabayashi
authors.forename: M
authors.initials: M
authors.lastname: Inagawa
authors.forename: A
authors.initials: A
authors.lastname: Kitamura
authors.forename: S
authors.initials: S
authors.lastname: Sato
authors.forename: H
authors.initials: H
authors.lastname: Imano
authors.forename: M
authors.initials: M
authors.lastname: Iida
authors.forename: Y
authors.initials: Y
authors.lastname: Komachi
mesh_terms: D000328:Adult; D000368:Aged; D002940:Circadian Rhythm; D004039:Diet, Sodium-Restricted; D005260:Female; D006266:Health Education; D006801:Humans; D006973:Hypertension / Q000652:urine; D008297:Male; D008875:Middle Aged; D009318:Natriuresis / Q000502:physiology*; D011188:Potassium / Q000652:urine*; D012965:Sodium Chloride / Q000008:administration & dosage
chemical_list: D012965:Sodium Chloride; D011188:Potassium