Journal
CURRENT DEVELOPMENTS IN NUTRITION
Volume 5, Issue 11, Pages -Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cdn/nzab125
Keywords
controlled-feeding study; postmenopausal women; biomarker; sodium; potassium; 24-hour urine; spot urine
Categories
Funding
- National Heart, Lung, and Blood Institute, National Institutes of Health, US Department of Health and Human Services [75N92021D00001, 75N92021D00002, 75N92021D00003, 75N92021D00004, 75N92021D00005, HHSN271201600004C]
- National Cancer Institute (NCI) [R01 CA119171]
- NIH/NCI Cancer Center Support grant [P30 CA015704]
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Comparing sodium and potassium excretions from 24-hour urine collections with spot urine samples can reduce burden in epidemiologic and clinical studies. The study found that measuring 24-hour urine excretion is more accurate in reflecting sodium and potassium intake compared to estimating from spot urine samples.
Background: Assessing estimated sodium (Na) and potassium (K) intakes derived from 24-h urinary excretions compared with a spot urine sample, if comparable, could reduce participant burden in epidemiologic and clinical studies. Objectives: In a 2-week controlled-feeding study, Na and K excretions from a 24-h urine collection were compared with a first-void spot urine sample, applying established algorithms and enhanced models to estimate 24-h excretion. Actual and estimated 24-h excretions were evaluated relative to mean daily Na and K intakes in the feeding study. Methods: A total of 153 older postmenopausal women ages 75.4 +/- 3.5 y participated in a 2-wk controlled-feeding study with a 4-d repeating menu cycle based on their usual intake (ClinicalTrials.gov Identifier: NCT00000611). Of the 150 participants who provided both a first-void spot urine sample and a 24-h urine collection on the penultimate study day, statistical methods included Pearson correlations for Na and K between intake, 24-h collections, and the 24-h estimated excretions using 4 established algorithms: enhanced biomarker models by regressing ln-transformed intakes on ln-transformed 24-h excretions or ln-transformed 24-h estimated excretions plus participant characteristics and sensitivity analyses for factors potentially influencing Na or K excretion (e.g., possible kidney disease estimated glomerular filtration rate <60 mL/min/1.73 m(2)). Results: Pearson correlation coefficients between Na and K intakes and actual 24-h excretions were 0.57 and 0.38-0.44 for estimated 24-h excretions, depending on electrolyte and algorithm used. Enhanced biomarker model cross-validated R-2 (CVR2) for 24-h excretions were 38.5% (Na), 40.2% (K), and 42.0% (Na/K). After excluding participants with possible kidney disease, the CVR2 values were 43.2% (Na), 40.2% (K), and 38.1% (Na/K). Conclusions: Twenty-four-hour urine excretion measurement performs better than estimated 24-h excretion from a spot urine as a biomarker for Na and K intake among a sample of primarily White postmenopausal women.
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