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Influence of physical activity on hydration state in children with obesity before and after a weight loss program

Judith Baert1, Stephanie Van Biervliet2, Jean-Pierre Van Biervliet3

  • 1a Pediatrics , Ghent University Hospital , Belgium.

Acta Clinica Belgica
|July 22, 2018
PubMed

Insights

A 1-year slimming program significantly reduced weight in obese children, indicating dehydration after exercise. Aldosterone effects were observed in normal-weight children but not in those with obesity post-program.

Area of Science:

  • Pediatric Endocrinology
  • Sports Medicine
  • Obesity Research

Background:

  • Childhood obesity presents significant health challenges.
  • Exercise-induced dehydration is a concern in pediatric populations.
  • Residential slimming programs aim to improve health outcomes in children with obesity.

Purpose of the Study:

  • To assess the impact of a 1-year residential slimming program on exercise-induced dehydration in children with obesity.
  • To investigate changes in urinary electrolytes and hydration markers following a standardized exercise test before and after the program.

Main Methods:

  • A cohort of children with obesity participated in a 1-year standardized residential slimming program.
  • Urine samples, weight, blood pressure, and pulse were measured before and after a Cooper test at the program's start (T1) and end (T2).
  • Urinary analysis included volume, sodium (U_Na), potassium (U_K), urea, creatinine (U_creat), protein, and osmolality (U_osm).

Main Results:

  • The Cooper test resulted in significant weight loss at both T1 and T2 (p < 0.01), indicating dehydration.
  • Resting U_K/(U_Na + U_K)% significantly increased from T1 (40±11%) to T2 (50±11%).
  • In normal-weight participants, exercise significantly increased U_K/(U_Na + U_K)% and U_Na/U_creat (p < 0.01 and p < 0.05, respectively) at T2.

Conclusions:

  • Significant weight loss post-exercise confirms exercise-induced dehydration in the study cohort.
  • The slimming program did not elicit an aldosterone effect (measured by U_K/(U_Na + U_K)%) in children with obesity, unlike in normal-weight children.
  • These findings suggest differential physiological responses to exercise and hydration in obese versus normal-weight children following a weight management program.

Keywords:
Obesitydehydrationrenin-angiotensin aldosterone systemresidential slimming programsport

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