In December 2018 researchers from Spain published the results of their study to assess the hydration status and water intake in 242 children, aged 7-12 years, together with an assessment of their physical activity and sedentary behaviour. A 24-hour urine sample was collected from each child and their hydration status assessed. In addition, a 3-day dietary record was completed to evaluate their water intake. Results showed that only 48.3% of the children had an adequate hydration status, with the percentage being significantly higher in females. However, only 20.9% showed an adequate intake of water. When lifestyle factors were taken into consideration, the more inactive schoolchildren appeared to be adequately hydrated whereas those undertaking physical activity for over 1 hour per day appeared be at a higher risk of having inadequate hydration.
Perales-García A et al. Physical activity and sedentary behavior impacts on dietary water intake and hydration status in Spanish schoolchildren: A cross-sectional study. PLoS One. 2018 Dec 31;13(12):e0208748