Changes in heart rate and heart rate variability in Thoroughbreds during prolonged road transportation

American Journal of Veterinary Research
H OhmuraJames H Jones

Abstract

To determine whether evaluation of heart rate (HR) and HR variability (HRV) during prolonged road transportation in horses provides a sensitive index of autonomic stimulation. Five 2-year-old Thoroughbreds. ECGs were recorded as horses were transported for 21 hours in a 9-horse van. Heart rate, high-frequency (HF) power, low-frequency (LF) power, and LF-to-HF ratio from Fourier spectral analyses of ECGs were calculated and compared with values recorded during a 24-hour period of stall rest preceding transportation. HR, HF power, and LF power had diurnal rhythms during stall rest but not during road transportation. Heart rate was higher and HF power and LF power lower during road transportation than stall rest, and HR, HF power, LF power, and LF-to-HF ratio all decreased with time during road transportation. Heart rate during stall rest was weakly and inversely associated with LF power, but during road transportation was strongly associated with LF power, HF power, and LF-to-HF ratio. Neither LF power nor HF power was correlated with LF-to-HF ratio during stall rest, but LF power was strongly and HF power weakly correlated with LF-to-HF ratio during road transportation. High-frequency power and LF power were significantly correl...Continue Reading

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Citations

Mar 29, 2012·American Journal of Veterinary Research·Hajime OhmuraJames H Jones
Mar 29, 2012·American Journal of Veterinary Research·Hajime OhmuraJames H Jones
Apr 2, 2015·Journal of Equine Science·Atsushi Hiraga, Shigeru Sugano
Feb 5, 2015·The Journal of Veterinary Medical Science·Masumi YoshidaMasayoshi Kuwahara
Jan 25, 2017·Journal of Veterinary Cardiology : the Official Journal of the European Society of Veterinary Cardiology·B H Eggensperger, C C Schwarzwald
Jul 4, 2019·Journal of Animal Physiology and Animal Nutrition·Ana MuñozCristina Riber
Sep 29, 2017·Journal of Equine Science·Hajime Ohmura, James H Jones
Nov 13, 2012·The Veterinary Record·C C B M MunstersM M Sloet van Oldruitenborgh-Oosterbaan
Jan 21, 2021·The Veterinary Journal·Katharyn J Mitchell, Colin C Schwarzwald

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