Institute of Sport Sciences, University of Lausanne, Quartier, UNIL-Centre, Bâtiment, Synathlon, Lausanne, Switzerland; Department of Experimental Psychology, University of Granada, Spain; Mind, Brain & Behavior Research Center, University of Granada, Spain.
Department of Experimental Psychology, University of Granada, Spain; Mind, Brain & Behavior Research Center, University of Granada, Spain.
Neurosci Biobehav Rev. 2024 Sep;164:105821. doi: 10.1016/j.neubiorev.2024.105821. Epub 2024 Jul 23.
Concepts such as "neurodoping" have contributed to an expansion in the area of transcranial direct current stimulation (tDCS) and its impact over physical performance in recent years. This umbrella review examines meta-analyses to evaluate tDCS's impact on exercise performance in healthy individuals. We identified 9 meta-analyses that met our inclusion criteria, encompassing 50 crossover studies and 683 participants. Like previous meta-analyses, we found a small but significant effect across individual studies (g = 0.28, 95%CI [0.18, 0.39]). However, we also found clear evidence of publication bias, low power and substantial variability in methodological decisions. The average effect became non-significant after accounting for publication bias (g = 0.10, 95%CrI [-0.04, 0.20], BF = 0.99), and a specification curve analysis showed that the final effect could range from g = -0.23 to g = 0.33, depending on decisions such as the formula used for estimating the effect size and multiple additional analytic steps. Overall, our findings suggest that current evidence does not conclusively support acute tDCS as an exercise performance enhancer.
近年来，“神经兴奋剂”等概念的出现，使得经颅直流电刺激（tDCS）领域及其对身体表现的影响不断扩大。本篇综述性元分析评估了 tDCS 对健康个体运动表现的影响。我们共确定了 9 项符合纳入标准的元分析，共涵盖 50 项交叉研究和 683 名参与者。与之前的元分析一样，我们发现各单项研究中存在着较小但显著的影响（g = 0.28，95%CI [0.18, 0.39]）。然而，我们也发现了明确的发表偏倚、低统计效能和方法学决策中存在较大变异性的证据。在考虑到发表偏倚后，平均效应变得不显著（g = 0.10，95%CrI [-0.04, 0.20]，BF = 0.99），且规范曲线分析表明，最终效应的范围可以从 g = -0.23 到 g = 0.33，具体取决于效应量的估计公式和额外的分析步骤等决策。总的来说，我们的研究结果表明，目前的证据并不能明确支持 tDCS 作为一种增强运动表现的方法。
