Neuromodulation by repetitive paired-pulse TMS at late I-wave intervals in older adults

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dc.contributor.authorLiao, W.Y.
dc.contributor.authorHand, B.J.
dc.contributor.authorRinaldi, G.
dc.contributor.authorSemmler, J.G.
dc.contributor.authorOpie, G.M.
dc.date.issued2025
dc.description.abstractThe efficacy of indirect (I) wave periodicity repetitive transcranial magnetic stimulation (iTMS) on the excitability of primary motor cortex (M1) in young adults can be modified by changing the late I-wave interval. Given that late I-wave activity is altered in older adults, this could contribute to age-related changes in M1 plasticity. To assess this possibility, the present study investigated the effects of iTMS using three late I-wave intervals (4.0, 4.5, and 5.0 ms) on M1 excitability in 17 older adults (69.6 ± 5.7 years; 10 females), which was compared to findings obtained previously in 17 young adults (27.2 ± 6.4 years, 12 females). Changes in M1 excitability were assessed using motor evoked potentials (MEPs) recorded from the right first dorsal interosseus to index single-pulse MEP1.0mV and paired-pulse short-interval intracortical facilitation (SICF). To increase sensitivity to different intracortical circuits, both measures were also recorded using posterior-anterior (PA) and anterior-posterior (AP) TMS currents. Within older adults, PA MEP1.0mV and SICF were facilitated following iTMS (both P < 0.0001) and these were not different between iTMS ISIs (both P > 0.077). In contrast, AP MEP1.0mV and SICF were potentiated by iTMS4.0 and iTMS5.0 (both P < 0.023). iTMS5.0 potentiation of AP circuits was also increased in older adults compared to young adults (both P < 0.004). These results suggest complex, timing-dependent effects of advancing age on the plasticity of the late I-wave circuits.
dc.description.statementofresponsibilityWei-Yeh Liao, Brodie J. Hand, Giuseppe Rinaldi, John G. Semmler, George M. Opie
dc.identifier.citationExperimental Brain Research, 2025; 243(6):140-1-140-13
dc.identifier.doi10.1007/s00221-025-07060-5
dc.identifier.issn0014-4819
dc.identifier.issn1432-1106
dc.identifier.orcidHand, B.J. [0000-0002-9778-343X]
dc.identifier.orcidRinaldi, G. [0000-0001-9943-6215]
dc.identifier.orcidSemmler, J.G. [0000-0003-0260-8047]
dc.identifier.orcidOpie, G.M. [0000-0001-7771-7569]
dc.identifier.urihttps://hdl.handle.net/2440/147466
dc.language.isoen
dc.publisherSpringer Nature
dc.relation.granthttp://purl.org/au-research/grants/arc/DP200101009
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/1139723
dc.relation.granthttp://purl.org/au-research/grants/arc/DE230100022
dc.rights© The Author(s) 2025. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.o rg/licenses/by/4.0/.
dc.source.urihttps://doi.org/10.1007/s00221-025-07060-5
dc.subjectElectromyography
dc.subjectEvoked Potentials, Motor
dc.subjecttranscranial magnetic stimulation; ageing; plasticity; primary motor cortex
dc.titleNeuromodulation by repetitive paired-pulse TMS at late I-wave intervals in older adults
dc.typeJournal article
pubs.publication-statusPublished

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