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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

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 spectroscopy Body composition DXA Dog Obesity

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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.