Theta burst repetitive transcranial magnetic stimulation attenuates somatosensory evoked potentials from the lower limb

BMC Neuroscience

Aimee J Nelson²  Mark F Jacobs¹  Kevin G H Lee¹  David A E Bolton¹  Michael J Asmussen¹  Christopher M Zapallow¹ 

[1] Department of Kinesiology, University of Waterloo, Waterloo, Canada;Department of Kinesiology, McMaster University, Hamilton, Canada

关键词: Lower limb;    Hoffmann reflex;    Somatosensory evoked potentials;    Continuous theta burst stimulation;   

Others  :  1140800
DOI  :  10.1186/1471-2202-13-133

 received in 2012-08-08, accepted in 2012-10-23,  发布年份 2012

【 摘 要 】

Background

Continuous theta burst stimulation (cTBS) is a form of repetitive transcranial magnetic stimulation which has been shown to alter cortical excitability in the upper limb representation of primary somatosensory cortex (SI). However, it is unknown whether cTBS modulates cortical excitability within the lower limb representation in SI. The present study investigates the effects of cTBS over the SI lower limb representation on cortical somatosensory evoked potentials (SEPs) and Hoffmann reflex (H-reflex) following tibial nerve stimulation at the knee. SEPs and H-reflex were recorded before and in four time blocks up to 30 minutes following cTBS targeting the lower limb representation within SI.

Results

Following cTBS, the P1-N1 first cortical potential was significantly decreased at 12–16 minutes. CTBS also suppressed the P2-N2 second cortical potential for up to 30 minutes following stimulation. The H-reflex remained statistically unchanged following cTBS although there was a modest suppression observed.

Conclusion

We conclude that cTBS decreases cortical excitability of the lower limb representation of SI as evidenced by suppressed SEP amplitude. The duration and magnitude of the cTBS after effects are similar to those observed in upper limb studies.

【 授权许可】

   
2012 Zapallow et al.; licensee BioMed Central Ltd.

【 图 表 】

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