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Type of publication: Journal Article
Type of document: Full Paper

Year: 2010

Authors: van den Hoven, R; Bauer, A; Hackl, S; Zickl, M; Spona, J; Zentek, J

Title: Changes in intramuscular amino acid levels in submaximally exercised horses - a pilot study.

Source: J Anim Physiol Anim Nutr (Berl). 2010; 94(4):455-464

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 time-dependent changes in intramuscular amino acid (AA) levels caused by exercise and by feeding a protein/AA supplement were analysed in nine horses. Horses were submitted to a total of four standardized exercise tests (SETs). Amino acid concentrations were determined prior to, immediately after, 4 and 18 h after exercise. The experiment was subdivided into two consecutive periods of 3 weeks. In each period two SETs were performed. In the second period, horses were given a protein/AA supplement within 1 h after exercise. Significant changes in mean plasma AA levels similar to previous studies were noted to be time-dependent and to be associated with feeding the supplement. The intramuscular concentrations of the free AA in relation to pre-exercise levels showed significant time-dependent changes for alanine, asparagine, aspartate, citrulline, glutamine, glycine, isoleucine, leucine, methionine, serine, taurine, threonine, tyrosine and valine. Feeding the supplement significantly increased the 4 h post-exercise intramuscular concentration of alanine, isoleucine, methionine and tyrosine. At 18 h after exercise, apart from isoleucine and methionine, levels were still increased and also those of asparagine, histidine and valine in relation to none treatment. Hence, it was concluded that AA mixtures administered orally to horses within 1 h after exercise increased intramuscular AA pool.

Keywords Pubmed: Amino Acids/metabolism*
Animal Feed
Animal Nutritional Physiological Phenomena
Dietary Proteins/administration & dosage*
Dietary Proteins/metabolism
Dietary Supplements
Muscle, Skeletal/metabolism*
Physical Conditioning, Animal/physiology*
Pilot Projects
Time Factors

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