Barnett C, Hinds M, Jenkins D G
Department of Human Movement Studies, University of Queensland.
Aust J Sci Med Sport. 1996 Mar;28(1):35-9.
This study examined the influence of oral creatine monohydrate supplementation on repeated 10 s cycle ergometer sprint performance. Seventeen recreationally active males (mean +/- SD age, body mass, height, and peak oxygen uptake = 20.5 +/- 1.2 yr, 72.1 +/- 10.3 kg, 176.8 +/- 6.6 cm and 3.87 +/- 0.91 l.min-1, respectively) participated in the 16 day experiment. All subjects initially completed a VO2peak test and were then administered glucose (4 x 10 g per day) in a single blind fashion for four days, after which they completed the first series of multiple sprints (7 x 10 s). Following the sprints, subjects were matched on sprint performance and divided into two groups (n = 8, placebo (Pl); and n = 9, creatine (Cr)). For the following four days, diets were supplemented with either Cr (4 x 70 mg.kg-1 body mass per day mixed with 5 g glucose) or glucose (4 x 10 g per day); supplementation during this phase was double-blind. Subjects then repeated the multiple sprint and VO2peak tests. Measures of peak power output (PPO), mean power output (MPO), end-power output (EPO), and percent power decline were recorded during the sprints. Each 10 s sprint was separated by 30 s of passive recovery except for sprints five and six which were separated by five minutes. Venous blood was sampled at rest, immediately after sprint five, before sprint six, and following sprint seven for the analysis of plasma lactate and blood pH. Expired air was sampled for five minutes following sprint seven for the calculation of post-exercise VO2. Analysis of variance revealed that four days of Cr supplementation did not influence multiple sprint performance, plasma lactate, blood pH and excess post-sprint oxygen consumption. Furthermore, VO2peak was unchanged following Cr supplementation. The data suggest that either the four day period of Cr supplementation failed to significantly raise resting muscle [Cr], or that multiple sprint performance was not enhanced by increases in resting muscle [Cr].
本研究考察了口服补充一水肌酸对重复进行10秒周期测力计冲刺性能的影响。17名有运动习惯的男性（平均±标准差年龄、体重、身高和峰值摄氧量分别为20.5±1.2岁、72.1±10.3千克、176.8±6.6厘米和3.87±0.91升·分钟⁻¹）参与了为期16天的实验。所有受试者最初完成了一次最大摄氧量（VO₂peak）测试，然后以单盲方式连续四天给予葡萄糖（每天4×10克），之后他们完成了第一系列的多次冲刺（7×10秒）。冲刺结束后，根据冲刺性能将受试者匹配并分为两组（n = 8，安慰剂组（Pl）；n = 9，肌酸组（Cr））。在接下来的四天里，饮食中要么补充肌酸（每天4×70毫克·千克体重，与5克葡萄糖混合），要么补充葡萄糖（每天4×10克）；此阶段的补充为双盲。然后受试者重复多次冲刺和VO₂peak测试。在冲刺过程中记录峰值功率输出（PPO）、平均功率输出（MPO）、终末功率输出（EPO）和功率下降百分比。除了第五次和第六次冲刺间隔五分钟外，每次10秒冲刺之间有30秒的被动恢复。在静息状态、第五次冲刺后即刻、第六次冲刺前以及第七次冲刺后采集静脉血，用于分析血浆乳酸和血液pH值。在第七次冲刺后采集五分钟的呼出气体，用于计算运动后VO₂。方差分析显示，四天的肌酸补充并未影响多次冲刺性能、血浆乳酸、血液pH值和冲刺后过量氧耗。此外，补充肌酸后VO₂peak没有变化。数据表明，要么四天的肌酸补充期未能显著提高静息肌肉中的[肌酸]，要么静息肌肉中[肌酸]的增加并未增强多次冲刺性能。
