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Sweat facilitated losses of amino acids in Standardbred horses and the application of supplementation strategies to maintain condition during training

Artikel i vetenskaplig tidskrift
Författare R. H. Dunstan
D. L. Sparkes
B. J. Dascombe
C. A. Evans
M. M. Macdonald
M. Crompton
J. Franks
G. Murphy
Johan Gottfries
B. Carlton
T. K. Roberts
Publicerad i Comparative Exercise Physiology
Volym 11
Nummer/häfte 4
Sidor 201-212
ISSN 1755-2540
Publiceringsår 2015
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 201-212
Språk en
Länkar dx.doi.org/10.3920/cep150027
Ämnesord exercise recovery, catabolism, muscle, sweat, amino acids
Ämneskategorier Veterinärmedicin

Sammanfattning

Little is known about the amino acid composition of horse sweat, but significant fluid losses can occur during exercise with the potential to facilitate substantial nutrient losses. Sweat and plasma amino acid compositions for Standardbred horses were assessed to determine losses during a standardised training regime. Two cohorts of horses 2013 (n=5) and 2014 (n=6) were assessed to determine baseline levels of plasma and sweat amino acids. An amino acid supplement designed to counter losses in sweat during exercise was provided after morning exercise daily for 5 weeks (2013, n=5; 2014, n=4). After the supplementation period, blood and sweat samples were collected to assess amino acid composition changes. From baseline assessments of sweat in both cohorts, it was found that serine, glutamic acid, histidine and phenylalanine were present at up to 9 times the corresponding plasma concentrations and aspartic acid at 0-2.2 mu mol/l in plasma was measured at 154-262 mu mol/l in sweat. In contrast, glutamine, asparagine, methionine and cystine were conserved in the plasma by having lower concentrations in the sweat. The predominant plasma amino acids were glycine, glutamine, alanine, valine, serine, lysine and leucine. As the sweat amino acid profile did not simply reflect plasma composition, it was proposed that mechanisms exist to generate high concentrations of certain amino acids in sweat whilst selectively preventing the loss of others. The estimated amino acid load in 16 l of circulating plasma was 3.8-4.3 g and the calculated loss via sweat during high intensity exercise was 1.6-3.0 g. Following supplementation, total plasma amino acid levels from both cohorts increased from initial levels of 2,293 and 2,044 mu mol/l to post-supplementation levels of 2,674 and 2,663 mu mol/l respectively (P<0.05). It was concluded that the strategy of providing free amino acids immediately after exercise resulted in raising resting plasma amino acid levels.

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