PDF(Pubmed)
Abstract：
This study aimed to investigate the effects of caffeine ingestion on anaerobic performance and muscle activity in young athletes. In this randomized, double-blind, and placebo-controlled study, ten highly trained male post-puberal futsal players aged 15.9 ± 1.2 years conducted two laboratory sessions. Athletes performed the Wingate test 60 min after ingestion of caffeine (CAF, 6 mg/kg body mass) or placebo (PL, dextrose) (blinded administration). Peak power, mean power, and the fatigue index were assessed. During the performance of the Wingate test, electromyographic (EMG) data were recorded from selected lower limbs muscles to determine the root mean square (RMS), mean power frequency (MPF), and median power frequency (MDPF) as frequency domain parameters and wavelet (WT) as time-frequency domain parameters. Caffeine ingestion increased peak (0.80 ± 0.29 W/Kg; p = 0.01; d = 0.42) and mean power (0.39 ± 0.02 W/Kg; p = 0.01; d = 0.26) but did not significantly affect the fatigue index (52.51 ± 9.48%, PL: 49.27 ± 10.39%; p = 0.34). EMG data showed that the MPF and MDPF parameters decreased and the WT increased, but caffeine did not have a significant effect on these changes (p > 0.05). Moreover, caffeine ingestion did not significantly affect RMS changes in the selected muscles (p > 0.05). Here we showed that acute caffeine ingestion improved anaerobic performance without affecting EMG parameters in young male futsal athletes.
摘要：
本研究旨在探讨咖啡因摄入对青少年运动员无氧表现和肌肉活动的影响。在这个随机的，双盲,和安慰剂对照研究，十名年龄在15.9±1.2岁的训练有素的男性五人制足球运动员进行了两次实验。运动员在摄入咖啡因后60分钟进行了Wingate测试（CAF，6mg/kg体重）或安慰剂（PL，右旋糖）（盲给药）。峰值功率,平均力量，并对疲劳指数进行评估。在进行Wingate试验期间,从选定的下肢肌肉记录肌电图（EMG）数据，以确定均方根（RMS），平均电源频率(MPF)，和中值电源频率（MDPF）作为频域参数和小波（WT）作为时频域参数。咖啡因摄入增加了峰值（0.80±0.29W/Kg;p=0.01;d=0.42）和平均功率（0.39±0.02W/Kg;p=0.01;d=0.26），但没有显着影响疲劳指数（52.51±9.48％，PL：49.27±10.39%；p=0.34）。EMG数据显示MPF和MDPF参数降低，WT升高，但咖啡因对这些变化没有显著影响(p>0.05)。此外，咖啡因摄入对所选肌肉的RMS变化没有显著影响(p>0.05)。在这里，我们表明，急性咖啡因摄入可改善年轻男性五人制足球运动员的无氧表现，而不会影响EMG参数。
