Reliability of the motor evoked potentials elicited through magnetic stimulation at three sites

Lefebvre, R. Craig; Pépin, André; Louis, P.-F.; Boucher, Jean

doi:10.1016/j.jmpt.2003.12.004

Cited by 15 publications

(20 citation statements)

References 13 publications

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“…MEP:M max amplitude correlations varied from 0.28 (little, if any, correlation) for the right median to 0.72 (high) for the left median, which are much lower than ICCs for MEP:M max ratios previously reported (Lefebvre et al, 2004). The MEP amplitudes used in calculating these ratios were derived from the UT (i.e., upper motor threshold to TMS).…”

Section: Resultsmentioning

confidence: 75%

“…MEP amplitudes were normalized to M max response amplitudes to allow for comparison between subjects and trials (Lefebvre et al, 2004). MEP:M max amplitude correlations varied from 0.28 (little, if any, correlation) for the right median to 0.72 (high) for the left median, which are much lower than ICCs for MEP:M max ratios previously reported (Lefebvre et al, 2004).…”

Section: Resultsmentioning

confidence: 88%

“…To ensure that MEP amplitudes were normalized and comparable between subjects (Lefebvre et al, 2004), MEP amplitudes were expressed as a ratio of the maximal M response amplitudes (MEP:M max amplitude). M max was used as a standard measure for comparison to the MEP amplitude because the M max response cannot be modulated and remains stable for a subject over repeated testing (Hugon, 1973).…”

Section: Data Processingmentioning

confidence: 99%

“…TMS-EPs have been qualitatively assessed using a 3D optical tracking system for coil placement and orientation (Dishman et al, 2002). Quantitative comparison of MEP amplitudes (elicited by stimulating transcranially over the vertex of the skull, over the cervical spine, and over the peripheral nerves) has also been reported (Lefebvre et al, 2004). Refinements in TMS techniques using a 3 dimensional digitizer for reproducible coil positioning in TMS mapping (Krings et al, 1997a;Miranda et al, 1997) and a frameless stereotactic system (FSS) have been described (Krings et al,1997b(Krings et al, , 1998(Krings et al, , 2001.…”

Section: Introductionmentioning

confidence: 99%

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Intra-Rater Reliability of a Transcranial Magnetic Stimulation Technique to Obtain Motor Evoked Potentials

Livingston

Ingersoll

2008

International Journal of Neuroscience

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The purpose of this study was to determine the intra-rater reliability of motor evoked potentials (MEP) obtained through transcranial magnetic stimulation (TMS). TMS was applied over the primary motor cortex of 16 healthy subjects. Motor thresholds, MEP latencies, and amplitudes were recorded from the contralateral upper limb on 6 occasions over 15 days. An intraclass correlation coefficient (ICC 2,1) was used to estimate reliability. The ICCs ranged from 0.60 to 0.92 for all MEP measures except amplitude (ICC = 0.01 to 0.34). MEPs obtained with the TMS technique described are generally reliable, although MEP amplitudes demonstrated less consistency.

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 88%

Section: Data Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Intra-Rater Reliability of a Transcranial Magnetic Stimulation Technique to Obtain Motor Evoked Potentials

Livingston

Ingersoll

2008

International Journal of Neuroscience

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“…However, when averaged, TMS measurements of motor cortex excitability have demonstrated good reliability. Indeed, in a test-retest design, motor threshold measured at the optimal site has been shown to be highly consistent from session to session, with an intraclass correlation ranging from 0.90 to 0.97 (Lefebvre et al, 2004;Malcolm et al, 2006). Regarding EEG, there is also no reason to believe that it is unreliable.…”

Section: Oscillatory Activity and Motor Cortex Excitabilitymentioning

confidence: 99%

EEG and neuronavigated single-pulse TMS in the study of the observation/execution matching system: Are both techniques measuring the same process?

Lepage

Saint-Amour

Théoret

2008

Journal of Neuroscience Methods

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Increased variability of motor cortical excitability to transcranial magnetic stimulation in migraine: a new clue to an old enigma

et al. 2011

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Increased, decreased or normal excitability to transcranial magnetic stimulation (TMS) has been reported in the motor (M1) and visual cortices of patients with migraine. Light deprivation (LD) has been reported to modulate M1 excitability in control subjects (CS). Still, effects of LD on M1 excitability compared to exposure to environmental light exposure (EL) had not been previously described in patients with migraine (MP). To further our knowledge about differences between CS and MP, regarding M1 excitability and effects of LD on M1 excitability, we opted for a novel approach by extending measurement conditions. We measured motor thresholds (MTs) to TMS, short-interval intracortical inhibition, and ratios between motor-evoked potential amplitudes and supramaximal M responses in MP and CS on two different days, before and after LD or EL. Motor thresholds significantly increased in MP in LD and EL sessions, and remained stable in CS. There were no significant between-group differences in other measures of TMS. Short-term variation of MTs was greater in MP compared to CS. Fluctuation in excitability over hours or days in MP is an issue that, until now, has been relatively neglected. The results presented here will help to reconcile conflicting observations.Electronic supplementary materialThe online version of this article (doi:10.1007/s10194-011-0379-4) contains supplementary material, which is available to authorized users.

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Reliability of the motor evoked potentials elicited through magnetic stimulation at three sites

Cited by 15 publications

References 13 publications

Intra-Rater Reliability of a Transcranial Magnetic Stimulation Technique to Obtain Motor Evoked Potentials

Intra-Rater Reliability of a Transcranial Magnetic Stimulation Technique to Obtain Motor Evoked Potentials

EEG and neuronavigated single-pulse TMS in the study of the observation/execution matching system: Are both techniques measuring the same process?

Increased variability of motor cortical excitability to transcranial magnetic stimulation in migraine: a new clue to an old enigma

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