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Lipid Metabolite Responses to Diet and Training in Sled Dogs^1,2,3,

Arleigh J. Reynolds^*,3, Laurent Fuhrer^*, Harris L. Dunlap, Mark D. Finke and Francis A. Kallfelz^*

^* Department of Clinical Sciences and Pathology, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853 Zero Kennels, Bakers Mills, NY, 12188 Alpo Pet Center, Alpo Petfoods, Allentown, PA, 18001

Two groups of Alaskan Huskies were fed either a high fat (HFD) or a high carbohydrate diet 4 wk before and during an 8-wk conditioning program. Aerobic bouts of exercise were performed before and after conditioning. Blood samples taken before and after each exercise test were analyzed for serum concentrations of free fatty acids (FFA), triglycerides (TG), vitamin E, glucose and serum lipase activity. The post-exercise FFA and TG values were greater in the HFD group both before and after training. There were no significant differences in plasma vitamin E or in serum lipase activity between diet groups. It is concluded that after an adequate period of adaptation, prolonged feeding of a HFD safely enhances the availability of local and peripheral lipid stores during exercise. Although the elevated levels of FFA and TG associated with HFD suggest enhanced potential for performance, further study of more prolonged and possibly more intense exercise is necessary to confirm this theory.

KEY WORDS: • sled dogs • exercise • free fatty acids • triglycerides

¹ Presented as part of the Waltham Symposium on the Nutrition of Companion Animals in association with the 15th International Congress of Nutrition, at Adelaide, SA, Australia, on September 23–25, 1993. Guest editors for this symposium were Kay Earle, John Mercer and D'Ann Finley.

² Supported by a grant from Alpo Petfoods Inc. and the American Veterinary Medical Association.

³ To whom correspondence should be addressed: 222A VRT, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853.