Broad Elizabeth M, Maughan Ronald J, Galloway Stuart D R
Dept of Sports Studies, University of Stirling, Scotland, UK.
Int J Sport Nutr Exerc Metab. 2005 Dec;15(6):665-79. doi: 10.1123/ijsnem.15.6.665.
In a randomized, placebo-controlled, double-blind crossover design, 15 trained males undertook exercise trials during two 4 wk supplementation periods, with either 3 g L-Carnitine L-tartrate (LCLT) or 3 g placebo (P) daily. Total carbohydrate and fat oxidation during 90 min steady state cycling were not different between 0 or 4 wk within LCLT or P trials (mean +/- standard deviation: carbohydrate oxidation P0 99 +/- 36, P4W 111 +/- 27, LCLT0 107 +/- 33, LCLT4W 112 +/- 32 g, respectively; fat oxidation P0 99 +/- 28, P4W 92 +/- 21, LCLT0 94 +/- 18, LCLT4W 90 +/- 22 g, respectively). Subsequent 20 km time trial duration was shorter after P (P0 31:29 +/- 3:50, P4W 29:55 +/- 2:58 min:s, P < 0.01), with no significant change over LCLT (LCLT0 31:46 +/- 4:06, LCLT4W 31.19 +/- 4.08 min:s). Four weeks LCLT supplementation had no effect on substrate utilization or endurance performance.
在一项随机、安慰剂对照、双盲交叉设计中，15名经过训练的男性在两个为期4周的补充期内进行了运动试验，分别每日补充3克左旋肉碱酒石酸盐（LCLT）或3克安慰剂（P）。在LCLT或P试验中，0周或4周时90分钟稳态骑行期间的总碳水化合物和脂肪氧化无差异（平均值±标准差：碳水化合物氧化，P0周99±36、P4周111±27、LCLT0周107±33、LCLT4周112±32克；脂肪氧化，P0周99±28、P4周92±21、LCLT0周94±18、LCLT4周90±22克）。随后的20公里计时赛持续时间在补充安慰剂后缩短（P0周31:29±3:50、P4周29:55±2:58分钟：秒，P<0.01），而在补充LCLT后无显著变化（LCLT0周31:46±4:06、LCLT4周31.19±4.08分钟：秒）。四周的LCLT补充对底物利用或耐力表现没有影响。
