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KMID : 1102220230420030340
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Kidney Research and Clinical Practice
2023 Volume.42 No. 3 p.340 ~ p.348
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Body water percentage from childhood to old age
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Hong Lu
Eric Ayers
Pragnesh Patel
Tej K. Mattoo
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Abstract
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Background: Total body water (TBW) increases with growth, but the body water percentage (TBW%) decreases with aging. The objective of our study was to delineate TBW% in males and females by bioelectrical impedance analysis (BIA) from early childhood to old age.
Methods: We enrolled 545 participants aged 3 to 98 years (258 male, 287 female). Among the participants, 256 had a normal weight and 289 were overweight. The TBW was measured by BIA, and TBW% was derived by dividing the TBW (L) value by body weight (kg). For analysis, we divided participants into the four age groups of 3?10, 11?20, 21?60, and ≥61 years.
Results: In normal-weight subjects, the TBW% was similar at 62% between males and females in the 3?10-year group. It remained unchanged in males until and through adult life, then decreased to 57% in the ≥61-year group. In normal-weight female subjects, the TBW% decreased to 55% in the 11?20-year group, remained relatively unaltered in the 21?60-year group, then decreased to 50% in the ≥61-year group. In overweight subjects, the TBW% values in males, as well as females, were significantly lower as compared to those with normal weight.
Conclusion: Our study showed that the TBW% in normal-weight males changes very little from early childhood to adult life compared to that of females, who showed a decrease in TBW% during the pubertal years. In normal-weight subjects of both sexes, the TBW% decreased after the age of 60 years. Overweight subjects had significantly lower TBW% as compared to those with normal weight.
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KEYWORD
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Aged, All ages, Bioelectrical impedance analysis, Body water, Child, Obesity
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