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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
Misell L. M., Lagomarcino N. D., Schuster V., Kern M.
From the Department of Exercise and Nutritional Sciences San Diego State University, San Diego, CA, USA
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% V.O2max for 30 min proceeded by 75%V.O2max until exhaustion. Measures: blood was taken at rest and after 45 min of exercise to assess concentrations of lactate, glucose, β-hydroxybutyrate (β-HBA), free fatty acids (FFA), glycerol and triacylglycerols (TG). Performance was assessed as time to exhaustion.
Results. V.O2max (72.0±8.0 vs 72.4± 9.0 ml.kg-1.min-1) and endurance time (99.8±23.5 vs 106.5±29.4 min) did not differ (p>0.05) between MCT and LCT trials, respectively. No differences (p>0.05) in lactate, glucose, β-HBA, FFA, glycerol or TG were detected between trials. Respiratory exchange ratio (RER) was higher (p<0.05) at 15 min for the MCT trial (0.97±0.10) versus the LCT trial (0.90±0.20), but was similar between trials at other timepoints.
Conclusions. Results indicate that chronic MCT consumption neither enhances endurance nor significantly alters performance-related metabolism in trained male runners.