Journal of Applied Physiology
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J Appl Physiol 79: 94-96, 1995;
8750-7587/95 $5.00
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Journal of Applied Physiology, Vol 79, Issue 1 94-96, Copyright © 1995 by American Physiological Society

ARTICLES

Relative expansion of extracellular water in obese vs. normal children

N. Battistini, F. Virgili, S. Severi, P. Brambilla, P. Manzoni, L. Beccaria and G. Chiumello
Istituto di Fisiologia, Universita di Modena, Italy.

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.


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