Does oral creatine supplementation enhance exercise performance of female Judo athletes?

本研究的主要目的是阐明口服肌酸补充剂对女子柔道运动员间歇性极量运动和等速大腿力量的影响。此外，我们还研究了运动对身体成分和能量代谢的影响。在这里，我们描述了在间歇性最大运动，等速大腿力量，和身体组成的restrictions.MethodsSubjects的性能：6名女子柔道运动员参加了这项研究。补充剂摄入方法和测量时间：首次测量后，受试者服用安慰剂（6 g葡萄糖，4次/d），连续6d，次日进行第二次测量。之后，受试者摄入肌酸（5 g肌酸一水合物+1 g葡萄糖，每天4次）6天，并在第二天接受第三次测量。 ...更多信息 ：受试者重复5次（间隔20 s）10 s的最大骑行。等速大腿力量：我们测量了膝关节在0（等长）、60、180、300度/s的每个角速度下的伸展和屈曲扭矩。身体成分：我们使用流体密度计测量身体成分。结果与讨论以往的研究报道补充肌酸可增强间歇性剧烈运动时的运动能力。然而，在这项研究中，所有的峰值功率，平均功率，在1次试验期间的功，其下降率（从第1次到第5次试验），总功没有改善后补充肌酸。180 °/s和300 °/s时的膝关节伸直力矩第3次测量值高于第1次测量值和第2次测量值（P < 0.05）。从第一次测量到第三次测量，体重和体脂百分比增加（P < 0.05），但去脂体重不变。我们得出结论：口服肌酸补充剂提高了女子柔道运动员在中、高角速度下的膝关节伸展力量，但不影响间歇性最大运动和去脂体重的表现。少

IntroductionThe main purpose of this study is to clarify the effects of oral creatine supplementation on performance during intermittent maximal exercise and isokinetic thigh strength and of female judo athletes. In addition, we examined the effects on body composition and energy metabolism during exercise. Here, we described the performance during intermittent maximal exercise, the isokinetic thigh strength, and the body composition for the restriction of space.MethodsSubjects : Six female Judo athletes participated in this study. Their ages were 19.67 ± 0.82 (±SD) years.Supplement intake method and measurement period : After first measurements, the subjects ingested placebo (6 g glucose, 4 times per a day) for six days, and received second measurements in the next day. Afterwards, the subjects ingested the creatine (5 g creatine monohydrate + 1 g glucose, 4 times per a day) for six days, and received third measurements in the next day.Performance during intermittent maximal exercise … More : The subjects repeated five bouts (20-s intervals) of 10-s maximal cycling.Isokinetic thigh strength : We measured knee extension and flexion torque at each angle velocity of 0 (isometric), 60, 180, 300 degree/s.Body composition : We used hydrodensitometry to measure the body composition. Oxygen rebreathing method was used to measure lung residual volume.Results and discussionPrevious studies reported that the creatine supplementation strengthened the performance during intermittent intense exercise. However, in this study, all of peak power, average power, and work during 1 trial, their decreasing rate (from 1st to 5th trial), and total work did not improved after creatine supplementation. The knee e extension torque at the 180 and 300 degree/s were higher (P < 0.05) in the third measurements compared with the first measurements and the second measurements. Body weight and percent body fat increased (P < 0.05) from the first measurements to the third measurements, but fat free weight unchanged.We conclude that oral creatine supplementation improves knee extension strength at middle and high angle velocities though it doesn't influence performance during intermittent maximal exercise and fat free weight in female Judo athletes. Less