Grindstaff P D, Kreider R, Bishop R, Wilson M, Wood L, Alexander C, Almada A
Department of Human Movement Sciences and Education, University of Memphis, Memphis, TN 38152, USA.
Int J Sport Nutr. 1997 Dec;7(4):330-46. doi: 10.1123/ijsn.7.4.330.
In a double-blind and randomized manner, 18 male and female junior competitive swimmers supplemented their diets with 21 g.day-1 of creatine monohydrate (Cr) or a maltodextrin placebo (P) for 9 days during training. Prior to and following supplementation, subjects performed three 100-m freestyle sprint swims (long course) with 60 s rest/recovery between heats. In addition, subjects performed three 20-s arm ergometer maximal-effort sprint tests in the prone position with 60 s rest/recovery between sprint tests. Significant differences were observed among swim times, with Cr subjects swimming significantly faster than P subjects following supplementation in Heat 1 and significantly decreasing swim time in the second 100-m sprint. There was also some evidence that cumulative time to perform the three 100-m swims was decreased in the Cr group. Results indicate that 9 days of Cr supplementation during swim training may provide some ergogenic value to competitive junior swimmers during repetitive sprint performance.
18名男女青少年竞技游泳运动员在训练期间以双盲随机方式，连续9天每天补充21克一水肌酸（Cr）或麦芽糖糊精安慰剂（P）。在补充前后，受试者进行了三次100米自由泳短距离冲刺（长池），每组之间休息/恢复60秒。此外，受试者在俯卧位进行了三次20秒的手臂测力计最大努力冲刺测试，每次冲刺测试之间休息/恢复60秒。游泳时间存在显著差异，补充后，Cr组受试者在第1组中游泳速度明显快于P组受试者，并且在第二次100米冲刺中游泳时间显著减少。也有一些证据表明，Cr组完成三次100米游泳的累计时间有所减少。结果表明，游泳训练期间补充9天的Cr可能会在重复冲刺表现中为青少年竞技游泳运动员提供一些增强体能的价值。
