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The Effect of Acute L-carnitine and Carbohydrate Intake on Cycling Performance

机译：急性左旋肉碱和碳水化合物摄入量对自行车运动性能的影响

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International Journal of Exercise Science 11(2): 404-416, 2018. Chronic supplementation of L-carnitine and carbohydrate has been reported to increase L-carnitine content in skeletal muscle and have positive influences on exercise variables and performance. This study investigated the acute intake of L-carnitine and carbohydrate on the exercise parameters of cycling. A total of 10 males (27.0 ± 4 years) completed two exercise sessions consisting of 40 min of cycling at 65% of VO2peak, followed by cycling to exhaustion at 85% of VO2peak. L-carnitine or a placebo was consumed 3 hours prior to exercise, and beverages consisting of 94 g of carbohydrate were consumed at both 2 hours, and 30 minutes prior to exercise. Repeated measures ANOVAs were used to compare respiratory exchange ratio (RER), blood lactate, and power output across experimental trials and time. A repeated measures t-test was used to analyze differences between conditions and time to exhaustion. RER was significantly lower (p=0.01) at baseline with L-carnitine ingestion (.83 ± .05) compared to the placebo ingestion (.86 ± .06). Blood lactate was significantly lower (p=0.02) after 10 minutes of cycling at 65% of VO2peak with ingestion of L-carnitine (35% change from baseline) compared to placebo ingestion (53% change from baseline). No differences were found for power output or time to exhaustion at 85% of VO2peak. Despite mentioned differences, acute intake of L-carnitine and carbohydrate does not appear to influence exercise parameters, likely due to a lack of sufficient change in the content of L-carnitine in skeletal muscle.
机译：国际运动科学杂志11（2）：404-416，2018.据报道，长期补充L-肉碱和碳水化合物会增加骨骼肌中L-肉碱的含量，并对运动变量和运动产生积极影响。这项研究调查了左旋肉碱和碳水化合物对自行车运动参数的急性摄入。共有10位男性（27.0±4岁）完成了两次锻炼，包括在VO2peak的65％处骑车40分钟，然后在VO2peak的85％处骑车直至筋疲力尽。运动前3小时要消耗左旋肉碱或安慰剂，运动前2小时和30分钟要消耗94克碳水化合物组成的饮料。重复测量方差分析用于比较整个实验试验和时间的呼吸交换率（RER），血乳酸和功率输出。重复测量t检验用于分析条件和疲劳时间之间的差异。相比于安慰剂摄入（0.86±.06），左旋肉碱摄入时的RER显着降低（p = 0.01）（0.83±.05）。与服用安慰剂（相比基线降低53％）相比，服用L-肉碱（相比基线降低35％）以65％VO2peak循环10分钟后，血乳酸显着降低（p = 0.02）。在VO2peak的85％时，功率输出或耗尽时间没有差异。尽管提到了差异，但由于骨骼肌中L-肉碱含量缺乏足够的变化，急性摄入L-肉碱和碳水化合物似乎并未影响运动参数。

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