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  The number of full-sine cycles per pulse influences the efficacy of multicycle transcranial magnetic stimulation

Pechmann, A., Delvendahl, I., Bergmann, T. O., Ritter, C., Hartwigsen, G., Gleich, B., et al. (2012). The number of full-sine cycles per pulse influences the efficacy of multicycle transcranial magnetic stimulation. Brain Stimulation, 5(2), 148-154. doi:10.1016/j.brs.2011.02.006.

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 Creators:
Pechmann, Astrid1, Author
Delvendahl, Igor1, Author
Bergmann, Til O.2, Author
Ritter, Christoph2, Author
Hartwigsen, Gesa2, Author              
Gleich, Bernhard3, Author
Gattinger, Norbert C.3, 4, Author
Mall, Volker1, Author
Siebner, Hartwig R.2, 5, Author
Affiliations:
1Department of Neuropediatrics and Muscle Disorders, Center for Pediatrics, University Medical Center, Freiburg, Germany, ou_persistent22              
2Department of Neurology, Christian Albrecht University Kiel, Germany, ou_persistent22              
3Institute of Medical Engineering (IMETUM), TU Munich, Germany, ou_persistent22              
4Heinz Nixdorf Chair for Medical Electronics, TU Munich, Germany, ou_persistent22              
5Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital Hvidovre, Denmark, ou_persistent22              

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Free keywords: Transcranial magnetic stimulation; Motor cortex; Motor threshold; Pulse configuration; Waveform; Polyphasic
 Abstract: Background Previous studies have shown that the efficacy of transcranial magnetic stimulation (TMS) to excite corticospinal neurons depends on pulse waveform. Objective/Hypotheses In this study, we examined whether the effectiveness of polyphasic TMS can be increased by using a pulse profile that consists of multiple sine cycles. Methods In eight subjects, single-pulse TMS was applied to the left primary motor hand area through a round coil attached to a stimulator device that generated polyphasic pulses consisting of one to six full-sine cycles with a cycle length of 86 μs. In different blocks, we varied the number of sine cycles per pulse and recorded the motor-evoked potential (MEP) from the right first dorsal interosseus muscle. For each stimulus type, we determined resting motor threshold (RMT), stimulus-response curve (SRC), and mean MEP amplitude evoked at maximal stimulator output to assess the efficacy of stimulation. Results Multicycle pulses were more effective than a single full-sine cycle in exciting corticospinal neurons. TMS with multicycle pulses resulted in lower RMT, larger MEP amplitudes at maximal stimulator output and a steeper slope of the SRC relative to a TMS pulse consisting of a single-sine cycle. The increase in efficacy was already evident when two full-sine cycles were used and did not increase further by adding more cycles to the TMS pulse. Conclusions Increasing the number of full-sine cycles per pulse can improve the efficacy of TMS to excite corticospinal neurons, but there is no simple linear relationship between the number of cycles and TMS efficacy.

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Language(s): eng - English
 Dates: 2011-02-232010-10-192011-02-252011-04-192012-04
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.brs.2011.02.006
PMID: 22037129
Other: 22037129
 Degree: -

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Title: Brain Stimulation
  Abbreviation : Brain Stimul
Source Genre: Journal
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Publ. Info: New York, NY : Elsevier
Pages: - Volume / Issue: 5 (2) Sequence Number: - Start / End Page: 148 - 154 Identifier: ISSN: 1935-861X
CoNE: https://pure.mpg.de/cone/journals/resource/1935-861X