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Relative expansion of extracellular water in obese vs. normal children
N Battistini1, F Virgili, S Severi
1Istituto di Fisiologia, Università di Modena, Italy.
Insights
Obese children show significantly more extracellular water (ECW) than intracellular water (ICW) compared to normal-weight children. This suggests early-onset water homeostasis disturbances in childhood obesity, impacting body composition assessments.
Area of Science:
- Pediatric Endocrinology
- Human Physiology
- Body Composition Analysis
Background:
- Childhood obesity is a growing public health concern.
- Understanding body composition in obese children is crucial for health management.
- Water distribution (intracellular vs. extracellular) is a key aspect of body composition.
Purpose of the Study:
- To investigate the distribution of intracellular water (ICW) and extracellular water (ECW) in prepubertal obese children.
- To compare water compartment distribution in obese children versus normal-weight children.
- To assess the implications of altered water distribution for body composition analysis in pediatric obesity.
Main Methods:
- Preliminary study comparing two groups of prepubertal children: 21 obese and 18 normal-weight (matched for age and sex).
- Measurement of intracellular water (ICW) and extracellular water (ECW) compartments.
- Statistical analysis to compare ECW/ICW ratios between groups.
Main Results:
- Obese children exhibited a significantly higher ratio of extracellular water to intracellular water (ECW/ICW = 0.76 +/- 0.09) compared to normal-weight children (ECW/ICW = 0.61 +/- 0.19).
- The difference in ECW/ICW ratio was highly significant (P < 0.0015).
- This expansion of ECW relative to ICW in obese children was consistent with findings in adult women.
Conclusions:
- Obesity in prepubertal children is associated with a significant relative expansion of extracellular water.
- Disturbances in water homeostasis may have an early onset in childhood obesity.
- Current body composition methodologies for normal populations may require adjustments for obese children due to altered water distribution.
Abstract:
This preliminary communication reports data regarding the distribution between intracellular (ICW) and extracellular (ECW) water compartments in a group of 21 prepubertal young obese children of both sexes in comparison with a group of 18 normal children weight matched for age. Our data indicate that obesity is associated with a highly significant relative expansion of extracellular water (ECW/ICW = 0.61 +/- 0.19 and 0.76 +/- 0.09 in control and obese subjects, respectively; P < 0.0015). This observation, which has been already reported in adult women, suggests that some disturbances of water homeostasis have an early onset and stress the need for an early control of energy imbalance in children. These findings are of great concern also in the field of human body composition, suggesting the opportunity for a critical reevaluation of the assumed constancy of some human body characteristics. Body composition methodologies developed for "normal" populations would require adjustment for use in the obese population, since a considerable error would be introduced.