Abstract
Body composition was estimated in 169 young tennis players using the multi-frequency impedance method to predict their fatfree-mass, fat, extra-cellular water, and total body water. Bioelectrical impedances at 1, 5, 10, 50 and 100 kHz were determined. Ratios of impedance at low to high frequencies (Z1/Z100; Z5/Z100) were also used as indicators of body water distribution. This sample is characterized by a greater body mass — fat mass, above all-than other Italian sport participants. Sexual dimorphism in body composition is also evident in this sample. The parameters of body composition, predicted by impedance measurements were compared with parameters obtained through other methods (skinfolds and BMI) on the same subjects. Results varied considerably, in relation to the various equations or different techniques employed. Besides demonstrating the value of multifrequency impedance measurements in the assessment of body composition, our findings indicate the necessity of further methodological research to validate the method under controlled conditions.
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