title: Indirect prediction of total body water content in healthy adult Beagles by single-frequency bioelectrical impedance analysis.
abstract: OBJECTIVE
  To develop equations for prediction of total body water (TBW) content in unsedated dogs by combining impedance (resistance and reactance) and morphological variables and to compare the results of those equations with TBW content determined by deuterium dilution (TBW(d)).
  
  
  METHODS
  26 healthy adult Beagles.
  
  
  METHODS
  TBW content was determined directly by deuterium dilution and indirectly with equations developed from measurements obtained by use of a portable bioelectric impedance device and morphological variables including body length, height, weight, and thoracic and abdominal circumferences.
  
  
  RESULTS
  Impedance and morphological data from 16 of the 26 dogs were used to determine coefficients for the following 2 equations: TBW(1) = -0.019 (BL(2)/R) + -0.199 (RC + AC) + 0.996 W + 0.081 H + 12.31; and TBW(2) = 0.048 (BL(2)/R) + -0.144 (RC + AC) + 0.777 W + 0.066 H + 0.031 X + 7.47, where AC is abdominal circumference, H is height, BL is body length, R is resistance, RC is rib cage circumference, W is body weight, and × is reactance. Results for TBW(1) (R(2)(1) = 0.843) and TBW(2) (R(2)(2) = 0.816) were highly correlated with the TBW(d). When the equations were validated with data from the remaining 10 dogs, the respective mean differences between TBW(d) and TBW(1) and TBW(2) were 0.17 and 0.11 L, which equated to a nonsignificant underestimation of TBW content by 2.4% and 1.6%, respectively.
  
  
  CONCLUSIONS
  Results indicated that impedance and morphological data can be used to accurately estimate TBW content in adult Beagles. This method of estimating TBW content is less expensive and easier to perform than is measurement of TBW(d), making it appealing for daily use in veterinary practice.
authors.forename: Laurence
authors.initials: L
authors.lastname: Yaguiyan-Colliard
authors.forename: Caroline
authors.initials: C
authors.lastname: Daumas
authors.forename: Sana
authors.initials: S
authors.lastname: Bousbiat
authors.forename: Michel
authors.initials: M
authors.lastname: Jaffrin
authors.forename: Philippe
authors.initials: P
authors.lastname: Cardot
authors.forename: Dominique
authors.initials: D
authors.lastname: Grandjean
authors.forename: Nathalie
authors.initials: N
authors.lastname: Priymenko
authors.forename: Patrick
authors.initials: P
authors.lastname: Nguyen
authors.forename: Françoise
authors.initials: F
authors.lastname: Roux
mesh_terms: D000818:Animals; D000886:Anthropometry / Q000379:methods*; D001823:Body Composition; D001834:Body Water / Q000378:metabolism*; D001835:Body Weight; D003903:Deuterium / Q000378:metabolism; D004285:Dogs / Q000502:physiology*; D017097:Electric Impedance; D005260:Female; D007201:Indicator Dilution Techniques / Q000662:veterinary; D008297:Male; D011237:Predictive Value of Tests; D015203:Reproducibility of Results
chemical_list: D003903:Deuterium