Physical Activity Neuroscience Laboratory (LABNAF), Physical Activity Sciences Postgraduate Program, Salgado de Oliveira University (UNIVERSO), Niterói, Brazil.
Physical Activity Sciences Laboratory (LACAF), Physical Activity Sciences Postgraduate Program, Salgado de Oliveira University (UNIVERSO), Niterói, Brazil.
J Strength Cond Res. 2019 May;33(5):1237-1243. doi: 10.1519/JSC.0000000000003123.
Lattari, E, Vieira, LAF, Oliveira, BRR, Unal, G, Bikson, M, de Mello Pedreiro, RC, Marques Neto, SR, Machado, S, and Maranhão-Neto, GA. Effects of transcranial direct current stimulation with caffeine intake on muscular strength and perceived exertion. J Strength Cond Res 33(5): 1237-1243, 2019-The aim of this study was to investigate the acute effects of transcranial direct current stimulation (tDCS) associated with caffeine intake on muscular strength and ratings of perceived exertion (RPE). Fifteen healthy young males recreationally trained (age: 25.3 ± 3.2 years, body mass: 78.0 ± 6.9 kg, height: 174.1 ± 6.1 cm) were recruited. The experimental conditions started with the administration of caffeine (Caff) or placebo (Pla) 1 hour before starting the anodal tDCS (a-tDCS or sham). There was an intake of 5 mg·kg of Caff or 5 mg·kg of Pla. After the intake, a-tDCS or sham was applied in the left dorsolateral prefrontal cortex with intensity of 2 mA and 20 minutes of duration. The experimental conditions were defined as Sham + Pla, a-tDCS + Pla, Sham + Caff, and a-tDCS + Caff. After the conditions, muscular strength and RPE were verified. Muscular strength was determined by volume load performed in bench press exercise. Muscular strength in Sham + Pla condition was lower compared with all others conditions (p < 0.05). The RPE in the Sham + Pla was greater compared with a-tDCS + Caff (p < 0.05). Muscular strength was greater in all experimental conditions, and a-tDCS + Caff had lower RPE compared with placebo. When very little gains in muscle strength are expected, both caffeine and tDCS were effective in increasing muscle strength. Besides, the improvement in RPE of the caffeine associated with a-tDCS could prove advantageous in participants experienced in strength training. In fact, coaches and applied sport scientists quantitating the intensity of training based on RPE.
拉塔里、E、维埃拉、LAF、奥利维拉、BRR、乌纳尔、G、比克森、M、德梅洛·佩德雷罗、RC、马尔克斯·内托、SR、马查多、S 和马拉尼奥内托、GA。经颅直流电刺激联合咖啡因摄入对肌肉力量和感知用力的影响。J 力量与调理研究 33(5):1237-1243,2019-本研究旨在探讨经颅直流电刺激(tDCS)联合咖啡因摄入对肌肉力量和感知用力(RPE)的急性影响。15 名健康的年轻男性(年龄:25.3 ± 3.2 岁，体重:78.0 ± 6.9 千克，身高:174.1 ± 6.1 厘米)参与了这项研究。实验条件从服用咖啡因(Caff)或安慰剂(Pla)开始，1 小时后开始进行阳极 tDCS(a-tDCS 或假刺激)。摄入剂量为 5mg·kg 的 Caff 或 5mg·kg 的 Pla。摄入后，在左侧背外侧前额叶皮层施加强度为 2mA 的 a-tDCS，持续 20 分钟。实验条件被定义为 Sham + Pla、a-tDCS + Pla、Sham + Caff 和 a-tDCS + Caff。在这些条件下，测试了肌肉力量和 RPE。肌肉力量通过卧推运动的容量负荷来确定。Sham + Pla 条件下的肌肉力量低于其他所有条件(p < 0.05)。Sham + Pla 条件下的 RPE 大于 a-tDCS + Caff 条件(p < 0.05)。在所有实验条件下，肌肉力量都有所增加，而 a-tDCS + Caff 的 RPE 低于安慰剂。当肌肉力量的增加预期很少时，咖啡因和 tDCS 都能有效增加肌肉力量。此外，咖啡因联合 a-tDCS 对 RPE 的改善可能对有力量训练经验的参与者有利。事实上，教练和应用运动科学家根据 RPE 来量化训练强度。
