Correction: Acute effects of single dose transcranial direct current stimulation on muscle strength: A systematic review and meta-analysis

There are errors in the reporting of the studies included in this systematic review and meta-analysis. The authors provide the following clarification:

1. The potential error of our article was to include data from the study conducted by Frazer et al. (2016) in the Results section regarding the maximal isometric voluntary contraction (MIVC). Eligibility criteria determined the exclusion of this article by the intervention (n = 3). In the study by Frazer et al. (2016), 4 consecutive sessions of anodal and sham transcranial direct current stimulation (tDCS) were used. In fact, the objective of our study was systematically to review the literature on the effects of single dose tDCS to improve muscle strength. Based on this objective, we performed the data analysis related to the MIVC. The new results of the MIVC showed that the heterogeneity of the data were not significant (I2 = 0%; p = 0.48), and there was a significant difference between a-tDCS and sham-tDCS with a small effect size (SMD = 0.38; CI95% = 0.10 to 0.65; Z = 2.68; p = 0.007). Exclusion of the study by Frazer et al. (2016) was not statistically significant compared to previous results (SMD = 0.29; CI95% = 0.05 to 0.54; Z = 2.36; p = 0.02).Thus, the results of this study remain the same.

The authors provide updates to sentences in the Abstract, Results, and Discussions sections to correct these errors. Please see the location of the error, the original text, and the author-corrected text here.

thumbnail

Download:

*

PPT

PowerPoint slide

*

PNG

larger image

*

TIFF

original image

https://doi.org/10.1371/journal.pone.0229858.t001

Additionally, the authors provide updated Figs 1 and 2 to address these errors. Please see the correct figures here.

thumbnail

Download:

*

PPT

PowerPoint slide

*

PNG

larger image

*

TIFF

original image

Fig 1. Flowchart of outcomes of search strategy.

https://doi.org/10.1371/journal.pone.0229858.g001

thumbnail

Download:

*

PPT

PowerPoint slide

*

PNG

larger image

*

TIFF

original image

Fig 2. Forest plot showing a comparison of MIVC between tDCS and Sham.

Hazime et al. (2017)#- internal rotador shoulder; Hazime et al. (2017)*- external rotador shoulder; Vargas et al. (2017)#- knee extensors dominant limb; Vargas et al. (2017)*- knee extensors non-dominant limb.

https://doi.org/10.1371/journal.pone.0229858.g002

References

1. Lattari E, Oliveira BRR, Monteiro Júnior RS, Marques Neto SR, Oliveira AJ, Maranhão Neto GA, et al. (2018) Acute effects of single dose transcranial direct current stimulation on muscle strength: A systematic review and meta-analysis. PLoS ONE 13(12): e0209513. https://doi.org/10.1371/journal.pone.0209513 pmid:30586389