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Interdevice variability in percent fat estimates using the BOD POD

2005; Springer Nature; Volume: 59; Issue: 9 Linguagem: Inglês

10.1038/sj.ejcn.1602202

1476-5640

Stephen Ball,

Sports Performance and Training

To evaluate interdevice reliability in body density (Db) and percent body fat (%BF) using air-displacement plethysmography, the BOD POD (BP) body composition system. Duplicate body composition tests were performed in immediate succession on 50 adults (26 M, 24F; 21–53 y) using two BP units located in the same body composition laboratory. Mean Db and %BF between BP1 and BP2 did not differ significantly for men (ΔDb=0.0003±0.0008 g/ml, P=0.632; Δ%BF=0.1±1.3, P=0.665), while for women, there were small but significant differences in Db and %BF between BP1 and BP2 (ΔDb=0.0018±0.0003 g/ml, P=0.001; Δ%BF=0.8±1.1, P=0.001). The regression between %BF by BP1 and BP2 did not deviate significantly from the line of identity for both men and women (R2=0.95, standard error of estimate (s.e.e.)=1.23 %BF for men; R2=0.97, s.e.e=1.13 %BF for women). Individual variations in %BF estimates between the two BP units were within acceptable ranges (95% limits of agreement=−2.5–2.7 %BF for men; −1.4–3.0 %BF for women), and there was no trend in individual differences as %BF varied (r=−0.19, P=0.359 for men; r=0.09, P=0.677 for women). Other subject characteristics, including age, body mass, height, and body mass index, did not significantly contribute to the differences in %BF estimates by the two BP units. No clinically significant differences in Db and %BF estimates exist between the BP units, and the interdevice variability of the BP has minimal impact on %BF estimates. Further, test-to-test reliability between BP units appears to be as good as within one unit.