Modelling of amino acid turnover in the horse during training and racing: A basis for developing a novel supplementation strategy

English version

Autoři: R. Hugh Dunstan ^aff001; Margaret M. Macdonald ^aff001; Brittany Thorn ^aff001; David Wood ^aff002; Timothy K. Roberts ^aff001
Působiště autorů: School of Environmental and Life Sciences, University of Newcastle, Callaghan, Australia ^aff001; Horsepower Pty Ltd, Windsor, NSW, Australia ^aff002
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0226988

Souhrn

Horses in heavy training in preparation for racing and competition have increased metabolic demands to support the more intensive levels of exercise and recovery. However, little is known at the metabolic level about amino acid turnover and the specific alterations of demand caused by high intensity exercise. During exercise, certain amino acids are required in greater quantities due to disproportionate losses via excretory systems and usage in biosynthetic pathways. This investigation has built a theoretical computer model in an attempt to bring together the published rates of protein intake and utilisation to try to understand how some amino acids might be in higher demand than others. The model indicated that after evaluation of the daily amino acid turnover, glutamine/glutamic acid (Glx), serine and ornithine were in negative nitrogen balance which identified these amino acids as critical limiting factors for anabolism. Adjustment of the modelling conditions to cater for high intensity training indicated that an additional demand was placed on eight amino acids, including GLx, valine, lysine, histidine and phenylalanine which could thus become limiting under these conditions. The modelling results indicated that an amino acid supplement with the correct amino acids to match demand could theoretically be beneficial to a 500Kg horse in quantities of 20-80g/day. These results open new avenues of research for specifically tailoring amino acid supplementation to meet demands for sports horses in heavy training and improving general well-being, especially in hotter climates.

Klíčová slova:

Amino acid metabolism – Excretion – Histidine – Horses – Protein metabolism – Serine – Sweat – Urine

Zdroje

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Modelling of amino acid turnover in the horse during training and racing: A basis for developing a novel supplementation strategy

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