Lattari Eduardo, de Oliveira Bruno Soares, Oliveira Bruno Ribeiro Ramalho, de Mello Pedreiro Rodrigo Cunha, Machado Sérgio, Neto Geraldo Albuquerque Maranhão
Physical Activity Neuroscience Laboratory (LABNAF), Physical Activity Sciences Postgraduate Program - Salgado de Oliveira University (UNIVERSO), Niterói, Brazil.
Physical Activity Sciences Postgraduate Program - Salgado de Oliveira University (UNIVERSO), Niterói, Brazil.
Neurosci Lett. 2018 Jan 1;662:12-16. doi: 10.1016/j.neulet.2017.10.007. Epub 2017 Oct 6.
The limiting factors of maximum performance in humans have been extensively investigated. The aim of this study was to verify the acute effects of transcranial direct current stimulation on time limit (i.e., the time by which an individual is able to sustain a certain intensity of effort) at 100% of peak power (tlim@100%PP) and ratings of perceived exertion (RPE). Eleven moderately active women underwent an anthropometric evaluation and a maximal incremental test in the cycle ergometer, in order to obtain peak power (PP). At the two subsequent visits, which were separated by 48-72h, participants were randomly assigned to two experimental conditions: anodal stimulation (a-tDCS) and sham. In the a-tDCS condition, the stimulus was applied in the left dorsolateral prefrontal cortex (DLPFC), with intensity of 2mA for 20min. In the sham condition, the equipment was switched off after 30s of stimulation. Immediately after the conditions, participants performed the tlim@100%PP. Immediately after the tlim@100%PP test, the RPE scale was applied. The results demonstrated that the tlim@100%PP was higher in a-tDCS condition compared to sham condition (p=0.005). No difference was found between the conditions (a-tDCS vs sham) for the RPE (p=0.52). The anodal stimulus increased the tolerance to the exercise performed in the cycloergometer with maximum load, having some ergogenic effect in exercises of cyclic characteristics.
人类最大运动能力的限制因素已得到广泛研究。本研究的目的是验证经颅直流电刺激对最大功率（PP）100%时的时间限制（即个体能够维持一定强度运动的时间）（tlim@100%PP）和主观用力感觉评级（RPE）的急性影响。11名中度活跃的女性进行了人体测量评估和在功率自行车上的最大递增测试，以获得最大功率（PP）。在随后间隔48 - 72小时的两次访视中，参与者被随机分配到两种实验条件：阳极刺激（a - tDCS）和假刺激。在a - tDCS条件下，刺激施加于左侧背外侧前额叶皮层（DLPFC），强度为2mA，持续20分钟。在假刺激条件下，刺激30秒后设备关闭。条件刺激后立即，参与者进行tlim@100%PP测试。tlim@100%PP测试后立即应用RPE量表。结果表明，与假刺激条件相比，a - tDCS条件下的tlim@100%PP更高（p = 0.005）。在RPE方面，两种条件（a - tDCS与假刺激）之间未发现差异（p = 0.52）。阳极刺激增加了在最大功率负荷下功率自行车运动的耐受性，在具有循环特征的运动中具有一定的促力效果。
