Letter to the editor: No influence of static magnetic stimulation applied for 30 minutes over the human M1 on corticospinal excitability

Hamel, Raphaël; Fontaine, Émilie; Bernier, Pierre‐Michel; Lepage, Jean‐François

doi:10.1016/j.brs.2019.12.001

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…Error bar are standard errors of the mean. www.nature.com/scientificreports/ The suppression of the cortical excitability by tSMS on the stimulated M1 confirmed previous reports 13,16,20 , although the suppression effects of 30-min tSMS has been under ongoing discussion 26,27 . Our results reproduced and confirmed that the 30-min tSMS have the suppression effects on corticospinal excitability as shown in previous study 20 .…”

Section: Discussionsupporting

confidence: 83%

Transcranial static magnetic stimulation over the motor cortex can facilitate the contralateral cortical excitability in human

Takamatsu

Koganemaru

Watanabe

et al. 2021

Sci Rep

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Transcranial static magnetic stimulation (tSMS) has been focused as a new non-invasive brain stimulation, which can suppress the human cortical excitability just below the magnet. However, the non-regional effects of tSMS via brain network have been rarely studied so far. We investigated whether tSMS over the left primary motor cortex (M1) can facilitate the right M1 in healthy subjects, based on the hypothesis that the functional suppression of M1 can cause the paradoxical functional facilitation of the contralateral M1 via the reduction of interhemispheric inhibition (IHI) between the bilateral M1. This study was double-blind crossover trial. We measured the corticospinal excitability in both M1 and IHI from the left to right M1 by recording motor evoked potentials from first dorsal interosseous muscles using single-pulse and paired-pulse transcranial magnetic stimulation before and after the tSMS intervention for 30 min. We found that the corticospinal excitability of the left M1 decreased, while that of the right M1 increased after tSMS. Moreover, the evaluation of IHI revealed the reduced inhibition from the left to the right M1. Our findings provide new insights on the mechanistic understanding of neuromodulatory effects of tSMS in human.

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Section: Discussionsupporting

confidence: 83%

Transcranial static magnetic stimulation over the motor cortex can facilitate the contralateral cortical excitability in human

Takamatsu

Koganemaru

Watanabe

et al. 2021

Sci Rep

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“…We are pleased that our recent attempt to replicate the methods and results from Dileone et al [1] has garnered attention from the authors of the original findings. Briefly, despite having a~99% probability of replicating the results from Dileone et al [1], our results revealed that transcranial static magnetic stimulation (tSMS) yielded neither significant (all uncorrected p values > 0.101) nor meaningful (effect size values below medium-sized benchmark values; all Cohen's dz < 0.408) depression of corticospinal excitability (CSE) [2], a finding also reported by another group using a smaller sample [3]. Upon re-analysis of our data set, the authors reached the conclusion that tSMS rather significantly depressed CSE, hence disputing our conclusion.…”

Section: Dear Editorcontrasting

confidence: 72%

Response to significant influence of static magnetic stimulation applied for 30 minutes over the human M1 on corticospinal excitability

et al. 2020

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“…Participants wore a rubber swimming cap, which was used to mark the location of the motor hotspot (as in the methods of ref [ 40 ]), defined as the cortical location where motor-evoked potentials (MEPs) in the FDI were reliably induced using suprathreshold TMS pulses. Vertical lines were additionally drawn at the junction of participants’ skin and swimming cap, to ensure that the swimming cap did not move when performing the headings.…”

Section: Methodsmentioning

confidence: 99%

Sub-concussive head impacts from heading footballs do not acutely alter brain excitability as compared to a control group

Hamel,

Waltzing,

Massey

et al. 2024

PLoS ONE

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Background Repeated sub-concussive head impacts are a growing brain health concern, but their possible biomarkers remain elusive. One impediment is the lack of a randomised controlled human experimental model to study their effects on the human brain. Objectives This work had two objectives. The first one was to provide a randomised controlled human experimental model to study the acute effects of head impacts on brain functions. To achieve this, this work’s second objective was to investigate if head impacts from heading footballs acutely alter brain excitability by increasing corticospinal inhibition as compared to a control group. Methods In practised and unpractised young healthy adults, transcranial magnetic stimulation was used to assess corticospinal silent period (CSP) duration and corticospinal excitability (CSE) before and immediately after performing headings by returning 20 hand-thrown balls directed to the head (Headings; n = 30) or the dominant foot (Control; n = 30). Moreover, the Rivermead Post-Concussion Questionnaire (RPQ) was used to assess the symptoms of head impacts. Head acceleration was also assessed in subgroups of participants. Results The intervention lengthened CSP duration in both the Headings (6.4 ± 7.5%) and Control groups (4.6 ± 2.6%), with no difference in lengthening between the two groups. Moreover, CSE was not altered by the intervention and did not differ between groups. However, performing headings increased headaches and dizziness symptoms and resulted in greater head acceleration upon each football throw (12.5 ± 1.9g) as compared to the control intervention (5.5 ± 1.3g). Conclusions The results suggest that head impacts from football headings do not acutely alter brain excitability as compared to a control intervention. However, the results also suggest that the present protocol can be used as an experimental model to investigate the acute effects of head impacts on the human brain.

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Letter to the editor: No influence of static magnetic stimulation applied for 30 minutes over the human M1 on corticospinal excitability

Cited by 5 publications

References 10 publications

Transcranial static magnetic stimulation over the motor cortex can facilitate the contralateral cortical excitability in human

Transcranial static magnetic stimulation over the motor cortex can facilitate the contralateral cortical excitability in human

Response to significant influence of static magnetic stimulation applied for 30 minutes over the human M1 on corticospinal excitability

Sub-concussive head impacts from heading footballs do not acutely alter brain excitability as compared to a control group

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