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Publication type: Journal Article
Document type: Full Paper

Year: 2009

Author(s): Hackl, S; van den Hoven, R; Zickl, M; Spona, J; Zentek, J

Title: The effects of short intensive exercise on plasma free amino acids in standardbred trotters.

Source: J Anim Physiol Anim Nutr (Berl). 2009; 93(2):165-173

Authors Vetmeduni Vienna:

Van Den Hoven Rene
Zentek J├╝rgen

Vetmed Research Units
University Equine Clinic, Clinical Unit of Equine Internal Medicine
Institute of Animal Nutrition and Functional Plant Compounds

The aim of this study was to investigate the effect of short intense exercise on plasma amino acid concentrations in trotters and to test the repeatability of plasma amino acids concentration in samples obtained on two independent days under field conditions. Plasma amino acid concentrations were analysed in blood samples of 36 standardbred trotters before and after intense exercise over a distance of 2000 m. Sampling was repeated in 20 horses after 35 days. Exercise intensity was estimated from post-exercise lactate levels. Horses were divided in two groups according to a cut-off lactate concentration at 15 mmol/l. The plasma concentrations of alanine, aspartate, glutamate, isoleucine, leucine, lysine and taurine increased and arginine, asparagine, citrulline, glutamine, glycine, histidine, methionine, serine, tryptophan and 3-methylhistidine decreased after exercise. Ornithine, threonine, tyrosine, phenylalanine and valine concentrations remained constant. Higher intensity of exercise significantly decreased tryptophan and increased taurine concentrations. Sampling day had a significant effect on the absolute pre- and post-exercise amino acid concentrations. Exercise had a significant influence on the concentrations of most plasma amino acids in trotters. These changes could reflect shifts between the free amino acid compartments, but there were also some indications for muscle catabolism. The amino acid supply of sporting horses could be of specific significance for maintaining muscle integrity and for the improvement of post-exercise recovery of competition horses.

Keywords Pubmed: Amino Acids/blood*
Muscle, Skeletal/metabolism
Physical Conditioning, Animal/physiology*
Physical Exertion/physiology*

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