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Title
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Plasma acylcarnitine and fatty acid profiles during exercise and training in Standardbreds
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Author
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Abstract
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| Objective-To evaluate alterations in skeletal muscle carnitine metabolism during exercise and training by measuring changes in plasma acylcarnitine concentrations in Standardbreds. Animals-10 Standardbred geldings with a mean SD age of 20 +/- 2 months and weight of 384 +/- 42 kg. Procedures-In a 32-week longitudinal study, training on a treadmill was divided into 4 phases as follows: phase 1, acclimatization for 4 weeks; phase 2, 18 weeks with alternating endurance and high-intensity exercise training-, phase 3, increased training volume and intensity for another 6 weeks; and phase 4, deconditioning for 4 weeks. In phase 3, horses were randomly assigned to 2 groups as follows: control horses (which continued training at the same level as in phase 2) and high-intensity exercise trained horses. At the end of each phase, a standardized exercise test (SET) was performed. Plasma acylcarnitine, fatty acids, and lactic acid and Serum beta-hydroxybutyric acid (BHBA) concentrations were assessed before and at different time points after each SET. Results-Plasma lactic acid, total nonesterified fatty acids, 3-hydroxyisobutyric acid, and acetylcarnitine (C2-carnitine) concentrations significantly increased during SETs, whereas serum BHBA, plasma propionylcarnitine (C3-carnitine), and plasma butyryl- and isobutyrylcarnitine (C4-carnitine) concentrations decreased significantly, compared with those before SETs. Conclusions and Clinical Relevance-Our findings indicated that the plasma acylcarnitine profile in horses likely reflects skeletal muscle carnitine metabolism following exercise, thereby providing a possible practical method to investigate potential disorders in carnitine metabolism in horses with myopathy. (Am J Vet Res 2008:69:1469-1475) |
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Language
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English
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Source (journal)
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American journal of veterinary research. - Chicago, Ill.
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Publication
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Chicago, Ill.
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2008
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ISSN
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0002-9645
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DOI
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10.2460/AJVR.69.11.1469
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Volume/pages
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69
:11
(2008)
, p. 1469-1475
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ISI
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000260483800011
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Full text (Publisher's DOI)
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