Reliability of Air Displacement Plethysmography in a Large, Heterogeneous Sample

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Abstract

Introduction:

Several studies have assessed the validity of air displacement plethysmography (ADP), but few have assessed the reliability of ADP using a large, heterogeneous sample.

Purpose:

This study was conducted to determine the reliability of ADP using the Bod Pod® in a large, heterogeneous sample.

Methods:

A total of 980 healthy men and women (30 ± 15 yr, mean ± SD) completed two body composition assessments separated by 15-30 min. All testing was done in accordance with the manufacturer's instructions.

Results:

A significant correlation (r = 0.992, P = 0.001) was found between body density (BD) 1 (1.046 ± 0.001 kg·L−1; mean ± SEM) and BD 2 (1.046 ± 0.001 kg·L−1). A paired t-test revealed no significant difference between BD 1 and 2 (P = 0.935). The coefficient of variation (CV) for BD was 0.15%. A significant intraclass correlation coefficient (ICC) was found for BD (ICC = 0.996, P = 0.001), and the standard error of measurement (SEM) was 0.001 kg·L−1. Body mass (BM) 1 and 2 were correlated significantly (r = 0.999, P = 0.001); however, a significant (P = 0.001) decrease was seen from BM 1 (75.510 ± 0.461 kg) to BM 2 (75.497 ± 0.461 kg). Body volume (BV) tended to decrease (P = 0.08) from BV 1 (69.900 ± 0.449 L) to BV 2 (69.884 ± 0.449 L).

Conclusion:

ADP using the Bod Pod® appears to assess BD reliably; however, the observed CV suggests that multiple trials are necessary to detect small treatment effects.

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