Chryssanthopoulos C, Petridou A, Maridaki M, Mougios V
Physical Education and Sports Science, University of Athens, Athens, Greece.
Int J Sports Med. 2008 Apr;29(4):336-42. doi: 10.1055/s-2007-965340. Epub 2007 Sep 13.
This study compared the effect of single and multiple carbohydrate feedings before exercise on biochemical and physiological responses during exercise. Eight males performed 3 runs for 1 h at 70 % VO(2max) after consuming a meal containing 2.5 g carbohydrate per kg body mass in a single dose 3 h before exercise (SF), the same meal in 5 equal doses at 3, 2.5, 2, 1.5, and 1 h before exercise (MF), or a liquid placebo 3 h before exercise (P). RER and carbohydrate oxidation rates were higher in SF and MF compared to P trials, but there was no difference between SF and MF trials. Pre-exercise insulin was 2.0- and 3.4- fold higher in SF and MF, respectively, compared to P, and 1.7-fold higher in MF compared to SF. Glycerol and NEFA were higher in P compared to SF and MF trials before and at the end of exercise. In conclusion, a carbohydrate meal containing 2.5 g . kg(-1) ingested in doses over 3 h before running produced higher hyperinsulinemia pre-exercise than that produced when the meal was consumed in a single dose. Nevertheless, estimated carbohydrate utilization and adipose tissue lipolysis during exercise after multiple feedings seemed to be as high as after a single feeding.
本研究比较了运动前单次和多次摄入碳水化合物对运动期间生化和生理反应的影响。八名男性在运动前3小时单次摄入每千克体重含2.5克碳水化合物的一餐（SF）、在运动前3、2.5、2、1.5和1小时分5等份摄入同一餐（MF）或在运动前3小时摄入液体安慰剂（P）后，以70%最大摄氧量进行3次1小时的跑步。与P组试验相比，SF组和MF组的呼吸交换率和碳水化合物氧化率更高，但SF组和MF组试验之间无差异。与P组相比，运动前SF组和MF组的胰岛素分别高2.0倍和3.4倍，与SF组相比，MF组高1.7倍。在运动前和运动结束时，与SF组和MF组试验相比，P组的甘油和非酯化脂肪酸更高。总之，在跑步前3小时内分次摄入含2.5克·千克⁻¹的碳水化合物餐，运动前产生的高胰岛素血症比单次摄入该餐时更高。然而，多次喂食后运动期间估计的碳水化合物利用率和脂肪组织脂解似乎与单次喂食后一样高。
