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Relationships between hydration biomarkers and total fluid intake in pregnant and lactating women
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Relationships between hydration biomarkers and total fluid intake in pregnant and lactating women
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Journal Article
Relationships between hydration biomarkers and total fluid intake in pregnant and lactating women
2017
Overview
Introduction
Previous research established significant relationships between total fluid intake (TFI) and urinary biomarkers of the hydration process in free-living males and females; however, the nature of this relationship is not known for pregnant (PREG) and lactating (LACT) women.
Purpose
To determine the relationship between urinary and hematological hydration biomarkers with TFI in PREG and LACT.
Methods
Eighteen PREG/LACT (age: 31 ± 3 years, pre-pregnancy BMI: 24.26 ± 5.85 kg m
−2
) collected 24-h urine samples, recorded TFI, and provided a blood sample at 5 time points (15 ± 2, 26 ± 1, 37 ± 1 weeks gestation, 3 ± 1 and 9 ± 1 weeks postpartum during lactation); 18 pair-matched non-pregnant (NP), non-lactating (NL) women (age: 29 ± 4 years, BMI: 24.1 ± 3.7 kg m
−2
) provided samples at similar time intervals. Twenty-four-hour urine volume (
U
VOL
), osmolality (
U
OSM
), specific gravity (
U
SG
), and color (
U
COL
) were measured. Hematocrit, serum osmolality (
S
OSM
), and serum total protein (
S
TP
) were measured in blood.
Results
Significant relationships were present between TFI and urinary biomarkers in all women (
P
< 0.004); these relationships were not different between PREG and NP, and LACT and NL, except
U
VOL
in PREG (
P
= 0.0017). No significant relationships between TFI and hematological biomarkers existed (
P
> 0.05).
Conclusion
Urinary biomarkers of hydration, but not hematological biomarkers, have a strong relationship with TFI in PREG, LACT, NP, and NL women. These data suggest that urinary biomarkers of hydration reflect TFI during pregnancy and breast-feeding.
