Mujika I, Chatard J C, Lacoste L, Barale F, Geyssant A
Laboratoire de Physiologie-GIP Exercice, Faculté de Médecine, Université Jean Monnet, Saint-Etienne, France.
Med Sci Sports Exerc. 1996 Nov;28(11):1435-41. doi: 10.1097/00005768-199611000-00014.
This study was conducted to examine the effects of creatine (Cr) supplementation on sprint swimming performance and energy metabolism. Twenty highly trained swimmers (9 female, 11 male) were tested for blood ammonia and for blood lactate after the 25-, 50-, and 100-m performance in their best stroke on two occasions 7 d apart. After the first trial, subjects were evenly and randomly assigned to either a creatine (5 g creatine monohydrate 4 times per day for 5 d) or a placebo group (same dosage of a lactose placebo) in a double-blind research design. No significant differences in performance times were observed between trials. Post-exercise blood ammonia concentration decreased in the 50- and 100-m trials in the creatine group and in the 50-m trial in the placebo group. The supplementation period had no effect on post-exercise blood lactate. Therefore, creatine supplementation cannot be considered as an ergogenic aid for sprint performance in highly trained swimmers although adenine nucleotide degradation may be reduced during sprint exercise after 5 d of creatine ingestion.
本研究旨在探讨补充肌酸（Cr）对短距离游泳成绩和能量代谢的影响。20名训练有素的游泳运动员（9名女性，11名男性）在相隔7天的两次测试中，以其最佳泳姿完成25米、50米和100米游泳后，检测血氨和血乳酸水平。第一次试验后，在双盲研究设计中，受试者被均匀随机分为肌酸组（每天4次，每次5克一水肌酸，共5天）或安慰剂组（相同剂量的乳糖安慰剂）。两次试验之间的成绩时间没有显著差异。肌酸组50米和100米试验以及安慰剂组50米试验的运动后血氨浓度降低。补充期对运动后血乳酸没有影响。因此，尽管摄入肌酸5天后短跑运动期间腺嘌呤核苷酸降解可能减少，但补充肌酸不能被视为提高训练有素的游泳运动员短跑成绩的促力辅助手段。
