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Metabolic responses to oral tryptophan supplementation before exercise in horses.
Brief content of the article
This study was conducted to evaluate the effects of oral tryptophan (Trp) supplementation on exercise capacity and metabolic responses in horses. The authors used three horses, which had to perform an exercise test. The test consisted of various gaits at various speeds. The horses were exercised on a treadmill at a 6% incline and with a constant draught load of 40 kg. Two hours before exercise horses were given 50 g Trp by nasogastric tube. A control exercise test was conducted without Trp. During the control test, one horse was able to finish the final 30-min walk, whereas two horses finished after Trp administration. After Trp supplementation, blood lactate concentrations were significantly lower after the first and second trotting periods. Free fatty acids in plasma increased during exercise without any treatment-related differences. The authors concluded that although experimental plasma Trp levels were seven times higher than the control levels, Trp supplementation had no effect on exercise performance and metabolic responses to draught load exercise. A full abstract can be found on http://www.pubmed.com
Keywords: BCAA; amino acids; 5-HT; 5-hydroxytryptamine; draught load exercise.
Vervuert, I, Coenen, M. and Watermulder, E. 2005. Metabolic responses to oral tryptophan supplementation before exercise in horses. J. Anim. Phys. a Anim. Nutr. 89: 140-145.
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