Key result
A self-monitoring device using overnight urine samples reasonably estimated 24-hour urinary salt excretion, yielding an excretion-to-intake ratio of approximately 0.8 during high-salt and 1.0 during low-salt phases.
Why the study?
Does a self-monitoring device accurately estimate 24-hour urinary salt excretion from overnight urine samples in young healthy females?
Observational (n=12)
Does a self-monitoring device accurately estimate 24-hour urinary salt excretion from overnight urine samples in young healthy females?
A self-monitoring device using overnight urine samples provides a reasonably valid estimation of 24-hour urinary salt excretion to detect daily changes in salt intake.
May support convenient home salt monitoring; leaves open prospective validation before clinical adoption.
BACKGROUND: The purpose of this study was to investigate the relationship between salt intake and urinary salt excretion and to examine the validity of a self-monitoring device for estimating 24-h urinary salt excretion from overnight urine samples. METHODS: Twelve young, healthy female volunteers consumed test meals from days 1 to 14 and estimated urinary salt excretion on days 2-15 by using a self-monitoring device. The salt content of the test meals was as follows: 10 g (days 1-5), 6 g (days 6-8), 13 g (days 9-11), 6 g (day 12), 13 g (day 13), and 6 g (day 14). RESULTS: The average 24-h urinary salt excretion (the ratio of urinary salt excretion to salt intake of the previous day) estimated from the overnight urine samples was as follows: 8.01±1.15 g (0.73±0.11) on days 2-6, 5.86±0.85 g (1.01±0.15) on days 7-9, 9.69±1.64 g (0.74±0.13) on days 10-12, 6.51±1.56 g (1.03±0.25) on day 13, 8.60±3.25 g (0.71±0.14) on day 14, and 6.28±1.31 (1.05±0.22) on day 15. Thus, the salt excretion/salt intake ratio was approximately 0.8 during the high-salt phase and 1.0 during the low-salt phase. CONCLUSION: The estimation of 24-h urinary salt excretion from overnight urine samples by using a self-monitoring device is a reasonably valid method in this young and healthy female population for detecting daily changes in salt intake.
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Yasutake et al. (2013) conducted an observational in Healthy (n=12). Self-monitoring device for estimating 24-h urinary salt excretion vs. Known dietary salt intake was evaluated on 24-hour urinary salt excretion estimated from overnight urine samples. A self-monitoring device using overnight urine samples reasonably estimated 24-hour urinary salt excretion, yielding an excretion-to-intake ratio of approximately 0.8 during high-salt and 1.0 during low-salt phases.
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