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Table 2 Body composition variables at the period of stability, prior to competition, and respective differences

From: Accuracy of DXA in estimating body composition changes in elite athletes using a four compartment model as the reference method

N = 27 Period of Stability Prior to Competition Changes
  Mean ± SD Mean ± SD Mean ± SD
%FM4C 9.2 ± 4.1 8.0 ± 3.8 -1.22 ± 2.70b
FM4C (kg) 6.8 ± 3.3 5.9 ± 3.0 -0.94 ± 1.98b
FFM4C(kg) 66.1 ± 6.4 66.1 ± 6.0 0.07 ± 2.04
%FMDXA 12.1 ± 3.1b 11.7 ± 2.8b -0.41 ± 1.05
FMDXA (kg) 8.8 ± 2.8b 8.4 ± 2.5b -0.42 ± 0.93a
FFMDXA (kg) 63.4 ± 5.7b 62.9 ± 5.8b -0.45 ± 1.55
FFMD (g/cc) 1.100 ± 0.007 1.102 ± 0.009 0.002 ± 0.005
TBW/FFM 0.72 ± 0.02c 0.71 ± 0.03c 0.006 ± 0.016
M/FFM 0.057 ± 0.003c 0.057 ± 0.004c 0.000 ± 0.002
Protein/FFM 0.22 ± 0.02c 0.23 ± 0.03c 0.006 ± 0.016
  1. Abbreviations: %FM: relative fat mass; FM: fat mass; FFM: fat-free mass; 4C: four-compartment model; DXA: dual-energy x-ray absorptiometry; FFMD: density of fat-free mass; TBW/FFM: fat-free mass hydration; M/FFM: mineral fraction of fat-free mass; Protein/FFM: protein fraction of fat-free mass
  2. *Changes are calculated as: prior to competition minus period of stability
  3. a Significant difference from the period of stability and prior to competition, p < 0.05
  4. b Significant difference from the reference method, p < 0.05;
  5. c Significant difference from the value obtained based on chemical cadaver analysis, p < 0.05 (FFMD = 1.1 g/cc [7]; TBW/FFM = 0.738; M/FFM = 0.068; Protein/FFM = 0.194)