The influence of betaine on untrained and trained horses exercising to fatigue.
Because exercise fatigue has been associated with the accumulation of lactic acid, factors that influence lactate metabolism during exercise can potentially enhance performance. The objective of this study was to examine the effects of supplemental betaine on eight mature Thoroughbred horses before and after 8 wk of conditioning. The effects of betaine were tested in two cross-over design experiments, allowing each horse to receive both the control and betaine treatments at each fitness level. Ingestion of 80 mg of betaine/kg of BW for 14 d before exercise testing did not alter plasma lactate, glucose, free fatty acids (FFA), or triglyceride concentrations during exercise in the untrained or trained horses. A time x treatment interaction (P < .05) was observed for plasma lactate in untrained horses during recovery from exercise, and plasma lactate concentrations were lower (P < .05) at 60 min after exercise when untrained horses received betaine. Plasma FFA concentrations were lower (P < .05) before exercise and at 720 min after exercise when untrained horses received betaine. These data indicate that betaine may influence lactate metabolism following exercise in untrained horses; however, betaine does not seem beneficial for trained horses.
Warren
L K
LK
Department of Animal Sciences, University of Kentucky, Lexington 40546, USA. lkwarr00@pop.uky.edu
Lawrence
L M
LM
Thompson
K N
KN
D000818:Animals; D001622:Betaine / Q000494:pharmacology*; D001786:Blood Glucose / Q000378:metabolism; D018592:Cross-Over Studies; D005221:Fatigue / Q000503:physiopathology*; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D006736:Horses / Q000502:physiology*; D019344:Lactic Acid / Q000097:blood; D008082:Lipotropic Agents / Q000494:pharmacology*; D008297:Male; D010805:Physical Conditioning, Animal; D014280:Triglycerides / Q000097:blood
D001786:Blood Glucose; D005230:Fatty Acids, Nonesterified; D008082:Lipotropic Agents; D014280:Triglycerides; D019344:Lactic Acid; D001622:Betaine