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Measuring body composition in dogs using bioelectrical impedance spectroscopy.

L S Rae1, J S Rand2, L C Ward3

  • 1School of Veterinary Science, The University of Queensland, Gatton, Queensland 4343 Australia.

Veterinary Journal (London, England : 1997)
|January 24, 2024
PubMed
Summary

Bioimpedance spectroscopy (BIS) offers an objective method for assessing canine body composition, predicting fat-free mass (FFM) with high accuracy. This inexpensive technique provides a valuable alternative to traditional methods for veterinary care.

Keywords:
Bioelectrical impedance spectroscopyBody compositionDXADogObesity

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Area of Science:

  • Veterinary Medicine
  • Animal Physiology
  • Biomedical Engineering

Background:

  • Increasing prevalence of overweight and obesity in dogs necessitates objective body composition assessment.
  • Current quantitative methods for canine body composition are limited in routine clinical use.
  • Bioelectrical impedance analysis (BIA) shows promise but is not yet established for companion animals.

Purpose of the Study:

  • To validate bioimpedance spectroscopy (BIS) against dual-energy X-ray absorptiometry (DXA) for canine body composition analysis.
  • To determine resistivity coefficients for BIS in dogs.
  • To assess the accuracy of BIS in predicting fat-free mass (FFM) in a canine cohort.

Main Methods:

  • Validation of BIS against DXA, the reference method.
  • Determination of resistivity coefficients (ρe = 444.8, ρi = 1477.8 ohm.cm).
  • Prediction of FFM in 35 mixed-breed dogs using BIS.

Main Results:

  • FFM was predicted with an overall accuracy of 3.5% compared to reference values.
  • Individual FFM prediction was within 95% confidence (2 standard deviations) for 10% of cases.
  • BIS provided objective, quantitative body composition data.

Conclusions:

  • BIS is a validated, objective, and quantitative alternative to semi-quantitative body condition scoring in dogs.
  • BIS offers valuable insights into body water volumes, aiding fluid management.
  • BIS is an inexpensive, simple-to-perform technique, requiring minimal sedation.