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Cutaneous silent period in human FDI motor units

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Abstract

In this study, we aimed to use both the probability-based and the frequency-based analyses methods simultaneously to examine cutaneous silent period (CSP) induced by strong electrical currents. Subjects were asked to contract their first dorsal interosseus muscles so that one motor unit monitored via intramuscular wire electrodes discharged at a rate of approximately 8 Hz. Strong electrical stimuli were delivered to the back of the hand that created a subjective discomfort level of between 4 and 7 [0–10 visual analogue scale] and induced cutaneous silent period in all units. It was found that the duration of the CSP was significantly longer when the same data were analysed using frequency-based analysis method compared with the probability-based methods. Frequency-based analysis indicated that the strong electrical stimuli induce longer lasting inhibitory currents than what was indicated using the probability-based analyses such as surface electromyogram and peristimulus time histogram. Usage of frequency-based analysis for bringing out the synaptic activity underlying CSP seems essential as its characteristics have been subject to a large number of studies in experimental and clinical settings.

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Acknowledgments

This study is supported by the Marie Curie Chair project (GenderReflex; MEX-CT-2006-040317) and Turkish Scientific and Technological Research Organization (TUBITAK-107S029-SBAG-3556). We wish to thank Professor Gürbüz Çelebi for reading the first draft and advice.

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Authors and Affiliations

  1. Department of Biophysics, Faculty of Medicine, Ege University, Izmir, Turkey

    Mehmet C. Kahya & Ş. Utku Yavuz

  2. Atatürk Training and Research Hospital, Izmir, Turkey

    Mehmet C. Kahya

  3. Center for Brain Research, Ege University, Izmir, Turkey

    Kemal S. Türker

Authors
  1. Mehmet C. Kahya
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  2. Ş. Utku Yavuz
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  3. Kemal S. Türker
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Correspondence to Kemal S. Türker.

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Kahya, M.C., Utku Yavuz, Ş. & Türker, K.S. Cutaneous silent period in human FDI motor units. Exp Brain Res 205, 455–463 (2010). https://doi.org/10.1007/s00221-010-2380-6

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  • DOI: https://doi.org/10.1007/s00221-010-2380-6

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