Usefulness of age-adjusted equations to estimate body fat with air displacement plethysmography in male adolescent athletes.
This study was designed to examine the accuracy of air-displacement plethysmography (ADP) using Lohman's age-adjusted equations (Leq) and Siri's equation (Seq) in estimating body fat (BF) in male adolescent athletes, with the four-compartment (4C) model as reference. Subjects were 51 Caucasian boys (age, 15.5+/-1.2 years; weight, 71.0+/-11.9 kg; stature, 1.79+/-0.12 m). Comparison of means with the Wilcoxon test showed that BF estimates with Seq to be different from those with Leq and 4C model, (8.8+/-4.4 vs. 7.9+/-4.5 and 8.1+/-4.0 kg, respectively) ( p<0.001), suggesting an overestimation of BF. However, BF estimates with the Leq and with the 4C model were identical ( p>0.05). Estimates using Seq and Leq with the 4C model were similar, as shown by the 95% confidence intervals (-4.7-2.4 and -4.0-3.7, respectively). These findings suggest that in male adolescent athletes, the use of Leq improves estimates of BF by densitometry using ADP.
Sardinha
L B
LB
Exercise and Health Laboratory, Faculty of Human Movement, Technical University of Lisbon, Estrada da Costa, Cruz-Quebrada, Portugal. lsardinha@fmh.utl.pt
Silva
A M
AM
Teixeira
P J
PJ
D000273:Adipose Tissue / Q000033:anatomy & histology*; D000375:Aging / Q000502:physiology*; D001827:Body Height; D015992:Body Mass Index; D001835:Body Weight; D015519:Bone Density; D002675:Child, Preschool; D006801:Humans; D010991:Plethysmography / Q000379:methods*; D015203:Reproducibility of Results; D013177:Sports; D044465:White People