• Maria Del Carmen Bisi Molina, Taísa Sabrina Silva Pereira, Aline Silva Porto, Raiane Pereira Silva, Nathália Miguel Teixeira Santana, Nágela Valadão Cade, and José Geraldo Mill.
• Department of Integrated Health Education, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.
• Sao Paulo Med J. 2018 Mar 1; 136 (2): 150156150-156.

BackgroundEvaluation of sodium and potassium intake can be carried out using different methods. Biological markers are able to capture intra and inter-individual variability and are used as separate measurements of consumption. The aim of this study was to test the validity of a single measurement of urinary sodium and potassium excretion as representative of habitual intake.Design And SettingLongitudinal study, federal university.MethodsFood consumption data from a sample of adult university students and public servants (25 to 74 years old) were collected through 24-hour records and 12-hour urinary sodium and potassium excretion at five different times over a one-year period. The dietary data were entered into a nutritional research data software system and the sodium and potassium intakes were estimated. The variables were tested for normal distribution using the Kolmogorov-Smirnov test. One-way analysis of variance or the Kruskal-Wallis test was used to evaluate means. Correlations between measurements using Pearson or Spearman coefficients were calculated. The degree of agreement between the five measurements was given by the intraclass correlation coefficient.ResultsSatisfactory agreement was found between the five measurements of urinary sodium and potassium excretion over a year, with little variability in consumption.ConclusionA single measurement of urinary sodium and potassium accurately estimated the usual average consumption of these electrolytes. This can be used in population-based studies.

20 keywords...

hide…