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Publication Detail
Elevated haemoglobin levels in the motor cortex following 1 Hz transcranial magnetic stimulation - a preliminary study
  • Publication Type:
    Journal article
  • Publication Sub Type:
  • Authors:
    Chiang TC, Vaithianathan T, Leung T, Lavidor M, Walsh V, Delpy DT
  • Publication date:
  • Pagination:
    555, 560
  • Journal:
    Experimental Brain Research
  • Volume:
  • Issue:
  • Print ISSN:
1 Hz TMS over the motor cortex has been reported to increase activity in the motor cortex contralateral to stimulation, as evidenced by the elevated motor evoked potential (MEP) on the corresponding hand muscle. Little research, however, has assessed concomitant changes in the haemoglobin level in the un-stimulated motor cortex. An aim of this study was to measure the change of oxy- and deoxy-haemoglobin levels in the left motor cortex after 20 minutes of 1 Hz TMS over the right motor cortex. Subjects carried out a finger to thumb tapping task sequentially with 6 blocks of 10 cycles (30 seconds on and 60 seconds off). One block was performed before TMS and five after TMS. The results show that the level of oxy-haemoglobin in the unstimulated cortex increased after TMS over the contralateral hemisphere and that the increase lasted 40 minutes after 1 Hz stimulation. Deoxy-haemoglobin was slightly decreased during the first 15 minutes after stimulation. The results identify long term physiological changes resulting from 1 Hz stimulation and help to inform our understanding of interhemispheric interactions in TMS studies.
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