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Muscle metabolic response to track exercise in Standardbred trotters

Ronéus, Nils (1997). Muscle metabolic response to track exercise in Standardbred trotters. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Veterinaria, 1401-6257
ISBN 91-576-5233-3
[Doctoral thesis]

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This study was undertaken to investigate if measurement of plasma lactate concentration and certain muscle characteristics following a track test can provide important information about a horse's performance capacity. In Standardbred trotters, marked individual differences are evident in plasma lactate concentration and muscle metabolic responses to maximal and submaximal work performed on a race-course. A negative correlation was found between plasma lactate concentration to a submaximal test, and the horse's maximal trotting speed over 1600 m, and a more marked anaerobic glycolysis and ATP breakdown during maximal exercise, than had slower horses.Inverse correlations were found between stance time and both plasma lactate and percentage oftype IIB fibres, indicating that locomotion pattern may be partly dependent on both fibre type composition and metabolic profile in muscle. Neither fibre type composition, enzyme activities, nor plasma lactate or ammonia concentration after a race showed any correlation with performance potential, expressed as individual performance index (DPI).The results of this study also show that adenine nucleotide breakdown in muscle is of great importance for energy release during racing and that ATP and IMP concentrations can vary markedly among individual fibres after a race. Thus, metabolite determinations in whole muscle must be evaluated with caution as they are no more than mean values for metabolic response in different fibres during racing.​​​​​​​Tactical driving is important in racing; running against time in a track test or an exercise test on a treadmill is therefore more standardized than racing proper. It is evident that measurement ofplasma lactate and certain muscle characteristics after a standardized track test in 2-year-old Standardbred trotters can provide important information about a horse’s performance capacity. This type of information can be useful for trainers when subjecting a young horse to more individual training. However, further research is required before specific, detailed recommendations can be made regarding optimal training methods.

Authors/Creators:Ronéus, Nils
Title:Muscle metabolic response to track exercise in Standardbred trotters
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Veterinaria
Year of publishing :1997
Number of Pages:54
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:91-576-5233-3
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Medical Bioscience
Keywords:horse, plasma lactate, muscle, muscle characteristics, track test
Permanent URL:
ID Code:28306
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Deposited By: SLUpub Connector
Deposited On:13 Jun 2022 08:25
Metadata Last Modified:13 Jun 2022 08:41

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