[Application of transcranial magnetic stimulation for monitoring of the motor cortex condition in dynamics in healthy subjects].
Transcranial magnetic stimulation (TMS) is used already for sixteen years for studying human central nervous system. The main objective of this work was to study motor thresholds and their hemispheric asymmetry in healthy subjects during TMS. We examined 31 righthanded healthy students. Their motor thresholds were measured in May (before vacations), September (immediately after vacations), and November (two months after vacations). Magnetic stimulator Neurosoft-MS (Ivanovo, Russia) was used for TNS of the motor cortex. It was shown that in the absence of regular active functional loads on the right hand, the motor thresholds in healthy righthanders significantly increased under the TMS of the left hemisphere, and hemispheric asymmetry disappeared under conditions both of muscle relaxation and voluntary contraction. Motor thresholds under the left-side TMS decreased and hemispheric asymmetry recovered with the restart of the regular active functional loads on the right hand.
Gimranov
R F
RF
Burdenko Neurosurgery Institute, Russian Academy of Medical Sciences, Moscow.
D000328:Adult; D055590:Electromagnetic Phenomena / Q000379:methods*; D004594:Electrophysiology / Q000379:methods; D005500:Follow-Up Studies; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D009044:Motor Cortex / Q000502:physiology*; D009048:Motor Skills; D012016:Reference Values; D020711:Threshold Limit Values