Journal of Applied Physiology
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J Appl Physiol (August 15, 2003). doi:10.1152/japplphysiol.00118.2003
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Submitted on February 3, 2003
Accepted on August 9, 2003

Minor amounts of plasma medium chain fatty acids and no improved time trial performance after consuming triacylglycerols containing medium chain fatty acids

Bodil Vistisen1*, Lars Nybo2, Xuebing Xu1, Carl-Erik Hoy1, and Bente Kiens2

1 The Technical University of Denmark, BioCentrum-DTU, 2800 Lyngby, Denmark
2 University of Copenhagen, Institute of Exercise, 2100 Copenhagen, Denmark

* To whom correspondence should be addressed. E-mail: bvistisen{at}ifi.ku.dk.

Medium chain triacylglycerols (MCT) have a potential glycogen saving effect during exercise due to rapid hydrolysis and oxidation. However, studies comparing intake of carbohydrates (CHO) + 80-90g MCT with intake of CHO alone have revealed different results. The present study tested performance after consumption of specific structured triacylglycerol consisting of a mixture of medium chain fatty acids and long chain fatty acids to prevent the adverse effects observed by MCT (pure medium chain fatty acids) regarding gastro-intestinal distress. Seven well-trained subjects cycled 3 hours at 55% of VO2max during which they ingested CHO or CHO + specific structured triacylglycerols. Immediately afterwards the constant load cycling, the subjects performed a time trial of approximately 50 min duration. Breath and blood samples were obtained regularly during the experiment. Fatty acid composition of plasma triacylglycerols, fatty acids and phospholipids were determined. Performance was similar after administration of CHO + specific structured triacylglycerol (MLM) compared to CHO (50.0±1.8 min and 50.8±3.6 min, respectively). No plasma 8:0 was detected in the plasma lipid classes, but the amount of phospholipid fatty acids was significantly higher following CHO+MLM compared to CHO intake. The lacking time trial improvement after intake of medium chain fatty acids might be due to no available 8:0 in the systemic circulation. A higher level of plasma phospholipid fatty acids in the CHO+MLM compared with the CHO group was probably due to endogenous phospholipid release into chylomicrons.




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