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BACKGROUND: This study was designed to assess the effects of chronic consumption of medium-chain triacylglycerols (MCT) on endurance running performance. METHODS: Experimental design: participants completed the study in a randomized, cross-over, placebo-controlled, double-blind fashion. Setting: participants were recruited from the general community to participate in this university based study. Participants: twelve trained male endurance runners (30.5+/-5.2 years of age) completed the study. Interventions: participants consumed dietary supplements containing either 56 g of corn oil (LCT) or 60 g of MCT oil daily for 2 weeks. Following each dietary phase, participants completed a maximal treadmill test followed by an endurance treadmill test in which participants ran at 85% VO2max for 30 min proceeded by 75% VO2max until exhaustion. Measures: blood was taken at rest and after 45 min of exercise …