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Peer-reviewedCC BYPhysiological reports

The effects of TMS stimulus direction on corticospinal and cortico‐cortical excitability of the lower limb in healthy adults

  • M. C. Hall1
  • M. Zoghi2
  • L. Perraton1
  • S. Jaberzadeh1
  1. 1Monash University
  2. 2Federation University
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Abstract

Transcranial magnetic stimulation (TMS) studies in upper limb muscles have shown that stimulus direction can influence corticospinal and intracortical excitability; however, limited evidence exists for lower limb muscles. This study investigated the effect of TMS stimulus direction on corticospinal and intracortical excitability of the tibialis anterior (TA) muscle using paired‐pulse TMS. Nineteen healthy adults (10 males, 9 females; mean age 41.8 ± 23 years) participated. Single‐ and paired‐pulse TMS was delivered using a figure‐of‐eight coil oriented to induce anterior‐to‐posterior (AP) or posterior‐to‐anterior (PA) current flow in the left motor cortex while recording motor evoked potentials (MEPs) from the right TA. Resting motor threshold (RMT), short‐interval intracortical inhibition (SICI), long‐interval intracortical inhibition (LICI), and intracortical facilitation (ICF) were assessed under both stimulus directions in a single session. No significant differences were identified between AP and PA stimulation for RMT, SICI, or LICI (p > 0.05). However, AP stimulation produced significantly greater ICF responses compared with PA stimulation (p = 0.027). AP and PA stimulus directions produced comparable RMT, SICI, and LICI measures in the TA muscle, although AP stimulation elicited greater ICF. These findings suggest facilitatory intracortical circuits may be more sensitive to stimulus direction than inhibitory pathways.

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Cite

BibTeXRIS
BibTeX
@article{hall2026effects,
  title = {{The effects of TMS stimulus direction on corticospinal and cortico‐cortical excitability of the lower limb in healthy adults}},
  author = {M. C. Hall and M. Zoghi and L. Perraton and S. Jaberzadeh},
  journal = {Physiological reports},
  year = {2026},
  month = oct,
  doi = {10.14814/phy2.71144},
  url = {https://europepmc.org/article/PMC/PMC13673296},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - The effects of TMS stimulus direction on corticospinal and cortico‐cortical excitability of the lower limb in healthy adults
AU  - M. C. Hall
AU  - M. Zoghi
AU  - L. Perraton
AU  - S. Jaberzadeh
PY  - 2026
DA  - 2026/10/01
JO  - Physiological reports
DO  - 10.14814/phy2.71144
UR  - https://europepmc.org/article/PMC/PMC13673296
AB  - Transcranial magnetic stimulation (TMS) studies in upper limb muscles have shown that stimulus direction can influence corticospinal and intracortical excitability; however, limited evidence exists for lower limb muscles. This study investigated the effect of TMS stimulus direction on corticospinal and intracortical excitability of the tibialis anterior (TA) muscle using paired‐pulse TMS. Nineteen healthy adults (10 males, 9 females; mean age 41.8 ± 23 years) participated. Single‐ and paired‐pulse TMS was delivered using a figure‐of‐eight coil oriented to induce anterior‐to‐posterior (AP) or posterior‐to‐anterior (PA) current flow in the left motor cortex while recording motor evoked potentials (MEPs) from the right TA. Resting motor threshold (RMT), short‐interval intracortical inhibition (SICI), long‐interval intracortical inhibition (LICI), and intracortical facilitation (ICF) were assessed under both stimulus directions in a single session. No significant differences were identified between AP and PA stimulation for RMT, SICI, or LICI (p > 0.05). However, AP stimulation produced significantly greater ICF responses compared with PA stimulation (p = 0.027). AP and PA stimulus directions produced comparable RMT, SICI, and LICI measures in the TA muscle, although AP stimulation elicited greater ICF. These findings suggest facilitatory intracortical circuits may be more sensitive to stimulus direction than inhibitory pathways.
SN  - 2051-817X
ER  -