Misell L M, Lagomarcino N D, Schuster V, Kern M
Department of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
J Sports Med Phys Fitness. 2001 Jun;41(2):210-5.
This study was designed to assess the effects of chronic consumption of medium-chain triacylglycerols (MCT) on endurance running performance.
participants completed the study in a randomized, cross-over, placebo-controlled, double-blind fashion.
participants were recruited from the general community to participate in this university based study.
twelve trained male endurance runners (30.5+/-5.2 years of age) completed the study.
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.
blood was taken at rest and after 45 min of exercise to assess concentrations of lactate, glucose, beta-hydroxybutyrate (beta-HBA), free fatty acids (FFA), glycerol and triacylglycerols (TG). Performance was assessed as time to exhaustion.
VO2max (72.0+/-8.0 vs 72.4+/- 9.0 ml x kg(-1) x 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, beta-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.
Results indicate that chronic MCT consumption neither enhances endurance nor significantly alters performance-related metabolism in trained male runners.
本研究旨在评估长期食用中链甘油三酯（MCT）对耐力跑表现的影响。
参与者以随机、交叉、安慰剂对照、双盲方式完成本研究。
参与者从普通社区招募，参与这项基于大学的研究。
12名训练有素的男性耐力跑者（年龄30.5±5.2岁）完成了本研究。
参与者每天食用含56克玉米油（LCT）或60克MCT油的膳食补充剂，持续2周。在每个饮食阶段之后，参与者先完成一次最大跑步机测试，接着进行一次耐力跑步机测试，即参与者先以85%的最大摄氧量跑30分钟，然后以75%的最大摄氧量跑至 exhaustion。
在静息状态和运动45分钟后采集血液，以评估乳酸、葡萄糖、β-羟基丁酸（β-HBA）、游离脂肪酸（FFA）、甘油和甘油三酯（TG）的浓度。以 exhaustion 时间评估表现。
MCT组和LCT组的最大摄氧量（分别为72.0±8.0与72.4±9.0毫升·千克⁻¹·分钟⁻¹）和耐力时间（分别为99.8±23.5与106.5±29.4分钟）无差异（p>0.05）。各试验之间在乳酸、葡萄糖、β-HBA、FFA、甘油或TG方面未检测到差异（p>0.05）。MCT试验在15分钟时的呼吸交换率（RER）高于LCT试验（分别为0.97±0.10与0.90±0.20，p<0.05），但在其他时间点各试验之间相似。
结果表明，长期食用MCT既不会提高耐力，也不会显著改变训练有素的男性跑步者与表现相关的代谢。
