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J Appl Physiol 85: 1342-1348, 1998;
8750-7587/98 $5.00
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Vol. 85, Issue 4, 1342-1348, October 1998

Endurance in high-fat-fed rats: effects of carbohydrate content and fatty acid profile

Jørn W. Helge1, Kerry Ayre2, Suwadee Chaunchaiyakul2, Anthony J. Hulbert3, Bente Kiens1, and Leonard H. Storlien2

1 Copenhagen Muscle Research Centre, August Krogh Institute, DK-2100 Copenhagen Ø, Denmark; and Departments of 2 Biomedical Science and 3 Biological Sciences, University of Wollongong, Wollongong, New South Wales 2522, Australia

The purpose of this experiment was to study endurance performance and substrate storage and utilization in fat- or carbohydrate-fed rats. Ninety-nine rats were randomly divided into three groups and over 4 wk were fed either a carbohydrate-rich [CHO; 10% total energy content in the diet (E%) fat, 20 E% protein, 70 E% carbohydrate] diet or one of two fat-rich diets (65 E% fat, 20 E% protein, 15 E% carbohydrate) containing either saturated (Sat) or monounsaturated fatty acids (Mono). Each dietary group was randomly assigned to a trained (6 days/wk, progressive to 60 min, 28 m/min at a 10% incline) or a sedentary group. Rats were killed either before or after a treadmill endurance run to exhaustion. Training increased endurance (206%), but diet composition did not affect endurance in either trained or sedentary rats. beta -Hydroxyacyl-CoA dehydrogenase activity was increased in fat-fed but not carbohydrate-fed rats (P < 0.05). Respiratory exchange ratio during the initial phase of exercise was lower after the Mono compared with the Sat diet (P < 0.05) and higher after the CHO than the Sat diet (P < 0.05). Thus adaptation to a high-fat diet containing a moderate amount of carbohydrates did not induce enhanced endurance in either trained or untrained rats; however, substrate utilization was modulated by both amount and type of dietary fat during the initial stage of exercise in trained and sedentary rats.

performance; respiratory exchange ratio; fat diet; monounsaturated; saturated


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