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首页> 美国卫生研究院文献>Nutrients >Short-Term Creatine Loading Improves Total Work and Repetitions to Failure but Not Load–Velocity Characteristics in Strength-Trained Men
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Short-Term Creatine Loading Improves Total Work and Repetitions to Failure but Not Load–Velocity Characteristics in Strength-Trained Men

机译：短期肌酸加载可以改善全部工作和重复于失败但不能在强度培训的男性中的负载速度特征

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摘要

This study assessed the effects of a 7-day creatine (CRE) supplementation on the load–velocity profile and repeated sub-maximal bouts in the deep squat using mean propulsive velocity (MPV) and mean propulsive power (MPP). Eleven strength-trained men (31.4 ± 5.4 years) supplemented 0.3 g·kg−1·d−1 CRE or a placebo (PLA, maltodextrin) for seven days in a randomized order, separated by a 30-day washout period. Prior to and after the supplementation, the subjects performed an incremental maximal strength (1RM) test, as well as 3 × 10 repetitions and a repetitions-to-failure test (RFT), all at 70% 1RM. Maximal strength remained statistically unaltered in CRE (p = 0.107) and PLA (p = 0.568). No statistical main effect for time (p = 0.780) or interaction (p = 0.737) was observed for the load–velocity profile. The number of repetitions during RFT remained statistically unaltered in both conditions (CRE: +16.8 ± 32.8%, p = 0.112; PLA: +8.2 ± 47.2%, p = 0.370), but the effect size was larger in creatine compared to placebo (g = 0.51 vs. g = 0.01). The total work during RFT increased following creatine supplementation (+23.1 ± 35.9%, p = 0.043, g = 0.70) but remained statistically unaltered in the placebo condition (+15.0 ± 60.8%, p = 0.801, g = 0.08; between conditions: p = 0.410, g = 0.25). We showed that CRE loading over seven days did not affect load–velocity characteristics but may have increased total work and power output during submaximal deep squat protocols, as was indicated by moderate effect sizes.
机译：该研究评估了使用平均推进速度（MPV）和平均推进功率（MPP）的7天肌酸（CRE）补充对载荷 - 速度曲线和深度蹲下的重复次最大突出的影响。在随机顺序中，十一种强度训练的男性（31.4±5.4岁）补充了0.3g·kg-1·d-1 cre或安慰剂（pla，maltodextrin），以30天的洗涤期分开。在补充之前和之后，受试者进行增量的最大强度（1RM）测试，以及3×10重复和重复失效测试（RFT），全部为70％1RM。在CRE（P = 0.107）和PLA（P = 0.568）中，最大强度仍保持统计学上未置换。对于负载 - 速度分布，观察到时间（p = 0.780）或相互作用（p = 0.737）没有统计的主要效果。 RFT期间的重复次数在两个条件下统计（CRE：+ 16.8±32.8％，P = 0.112; PLA：+8.2±47.2％，P = 0.370），但与安慰剂相比，肌酸效果大小较大（ g = 0.51 vs.g = 0.01）。在肌酸补充剂后，RFT期间的总作用（+23.1±35.9％，P = 0.043，G = 0.70），但在安慰剂条件下保持统计学上（+15.0±60.8％，P = 0.801，G = 0.08;条件下： p = 0.410，g = 0.25）。我们展示七天的CRE负载不影响负载速度特性，但可能增加了潜水深蹲协议期间的总工作和功率输出，如中等效果大小所示。

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