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Urinary markers of hydration during 3-day water restriction and graded rehydration
Ist Teil von
European journal of nutrition, 2020-08, Vol.59 (5), p.2171-2181
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Purpose
This investigation had three purposes: (a) to evaluate changes in hydration biomarkers in response to a graded rehydration intervention (GRHI) following 3 days of water restriction (WR), (b) assess within-day variation in urine concentrations, and (c) quantify the volume of fluid needed to return to euhydration as demonstrated by change in
U
col
.
Methods
115 adult males and females were observed during 1 week of habitual fluid intake, 3 days of fluid restriction (1000 mL day
−1
), and a fourth day in which the sample was randomized into five different GRHI groups: no additional water, CON; additional 500 mL,
G
+0.50
; additional 1000 mL,
G
+1.00
; additional 1500 mL,
G
+1.50
; additional 2250 mL,
G
+2.25
. All urine was collected on 1 day of the baseline week, during the final 2 days of the WR, and during the day of GRHI, and evaluated for urine osmolality, color, and specific gravity.
Results
Following the GRHI, only
G
+1.50
and
G
+2.25
resulted in all urinary values being significantly different from CON. The mean volume of water increase was significantly greater for those whose
U
col
changed from > 4 to < 4 (+ 1435 ± 812 mL) than those whose
U
col
remained ≥ 4 (+ 667 ± 722 mL,
p
< 0.001).
Conclusions
An additional 500 mL of water is not sufficient, while approximately 1500 mL of additional water (for a total intake between 2990 and 3515 mL day
−1
) is required to return to a urine color associated with adequate water intake, following 3 days of WR.