Do waiting times in endurance vet gates affect the Cardiac Recovery Index (CRI)?

M. C. de Mira, Jane Williams, R. G. dos Santos, P. Rodrigues, B. Arroja, David Marlin

Research output: Contribution to journalJournal Article

Abstract

The cardiac recovery index (CRI) is currently a key component of veterinary inspections to 15 assess endurance horses metabolic status and fitness. Originally published by Ridgeway, it 16 instructs veterinarians to subtract from the first heart rate (HR1), collected when the horse is 17 initially presented for examination, a second HR (HR2), taken one minute after the horse starts 18 a 125ft (38.1m) out and back trot to assess gait. It is widely believed that an increase of more 19 than 4 bpm from HR1 might be an indicator of fatigue. The FEI rules instruct the 20 veterinarians to start the stopwatch exactly 1 min after the HR1 count instead of trot start, as 21 described previously. The aims of this study were to investigate how time delays in the vet 22 gate affect the HR1 count and the CRI during endurance competitions, and to characterise and 23 compare the time taken by veterinarians to measure the original version of the CRI (tCRIRIDG) 24 and the adapted CRI used in FEI endurance events (tCRIFEI). Data from 972 veterinary 25 inspections of horses that took place in different endurance competitions in three different 26 venues were collected. There was no association between the time elapsed from entering the 27 vet gate to the start of the HR1 count or from the HR1 count to the start of the trot-up or of 28 other stages of the inspection and the HR1 or the CRI (P>0.05). However, larger studies 29 involving more venues and different layouts are needed to corroborate our findings and to The cardiac recovery index (CRI) is currently a key component of veterinary inspections to 15 assess endurance horses metabolic status and fitness. Originally published by Ridgeway, it 16 instructs veterinarians to subtract from the first heart rate (HR1), collected when the horse is 17 initially presented for examination, a second HR (HR2), taken one minute after the horse starts 18 a 125ft (38.1m) out and back trot to assess gait. It is widely believed that an increase of more 19 than 4 bpm from HR1 might be an indicator of fatigue. The FEI rules instruct the 20 veterinarians to start the stopwatch exactly 1 min after the HR1 count instead of trot start, as 21 described previously. The aims of this study were to investigate how time delays in the vet 22 gate affect the HR1 count and the CRI during endurance competitions, and to characterise and 23 compare the time taken by veterinarians to measure the original version of the CRI (tCRIRIDG) 24 and the adapted CRI used in FEI endurance events (tCRIFEI). Data from 972 veterinary 25 inspections of horses that took place in different endurance competitions in three different 26 venues were collected. There was no association between the time elapsed from entering the 27 vet gate to the start of the HR1 count or from the HR1 count to the start of the trot-up or of 28 other stages of the inspection and the HR1 or the CRI (P>0.05). However, larger studies 29 involving more venues and different layouts are needed to corroborate our findings and to
Original languageEnglish
JournalComparative Exercise Physiology
Publication statusAccepted/In press - 17 Mar 2020

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de Mira, M. C., Williams, J., dos Santos, R. G., Rodrigues, P., Arroja, B., & Marlin, D. (Accepted/In press). Do waiting times in endurance vet gates affect the Cardiac Recovery Index (CRI)? Comparative Exercise Physiology.