Samantha K. Millard, Alan K. I. Chiang, Nahian Chowdhury, Wei-Ju Chang, Andrew J. Furman, Enrico De Martino, Thomas Graven-Nielsen, Siobhan M. Schabrun, David A. Seminowicz
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Given the link between individual peak alpha frequency (PAF) of resting-state electroencephalographic recordings and pain sensitivity, and the potential for rTMS to modulate PAF, we investigated these relationships through a secondary analysis of established rTMS-induced analgesia in an experimental model of sustained muscle pain.</p><p>In a randomized, single-blind, sham-controlled experiment, 30 healthy adults underwent either active (<i>n</i> = 15) or sham (<i>n</i> = 15) high-frequency rTMS (20 min) to the left dorsolateral prefrontal cortex for five consecutive days following the induction of sustained experimental pain by nerve growth factor (NGF) injected into the right extensor carpi radialis brevis muscle. The pain intensity was assessed daily for 14 days on a numerical rating scale (NRS). PAF of the resting-state electroencephalography (5 min) was assessed before and 1 day after the five rTMS treatment days.</p><p>The preregistered analysis revealed no significant changes in PAF following five consecutive days of active (from 9.90 ± 0.39 Hz to 9.95 ± 0.38 Hz) or sham (from 9.86 ± 0.44 Hz to 9.81 ± 0.35 Hz) rTMS, suggesting that the impact of rTMS on NGF-induced pain is independent of PAF modulation. However, exploratory analysis indicated an association between a larger absolute difference in baseline PAF to 10 Hz (i.e., the rTMS frequency) and higher NRS pain ratings at Day 5 in participants receiving active rTMS. This suggests rTMS is more efficient when delivered close to individual PAF or for those with PAF around 10 Hz, necessitating further exploration of PAF's role in rTMS-induced pain relief.</p>","PeriodicalId":11993,"journal":{"name":"European Journal of Neuroscience","volume":"62 4","pages":""},"PeriodicalIF":2.4000,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ejn.70219","citationCount":"0","resultStr":"{\"title\":\"Peak Alpha Frequency Is Not Significantly Altered by Five Days of Experimental Pain and Repetitive Transcranial Stimulation of the Left Dorsolateral Prefrontal Cortex\",\"authors\":\"Samantha K. Millard, Alan K. I. Chiang, Nahian Chowdhury, Wei-Ju Chang, Andrew J. Furman, Enrico De Martino, Thomas Graven-Nielsen, Siobhan M. Schabrun, David A. 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Peak Alpha Frequency Is Not Significantly Altered by Five Days of Experimental Pain and Repetitive Transcranial Stimulation of the Left Dorsolateral Prefrontal Cortex
Repetitive transcranial magnetic stimulation (rTMS) holds promise as a noninvasive pain treatment. Given the link between individual peak alpha frequency (PAF) of resting-state electroencephalographic recordings and pain sensitivity, and the potential for rTMS to modulate PAF, we investigated these relationships through a secondary analysis of established rTMS-induced analgesia in an experimental model of sustained muscle pain.
In a randomized, single-blind, sham-controlled experiment, 30 healthy adults underwent either active (n = 15) or sham (n = 15) high-frequency rTMS (20 min) to the left dorsolateral prefrontal cortex for five consecutive days following the induction of sustained experimental pain by nerve growth factor (NGF) injected into the right extensor carpi radialis brevis muscle. The pain intensity was assessed daily for 14 days on a numerical rating scale (NRS). PAF of the resting-state electroencephalography (5 min) was assessed before and 1 day after the five rTMS treatment days.
The preregistered analysis revealed no significant changes in PAF following five consecutive days of active (from 9.90 ± 0.39 Hz to 9.95 ± 0.38 Hz) or sham (from 9.86 ± 0.44 Hz to 9.81 ± 0.35 Hz) rTMS, suggesting that the impact of rTMS on NGF-induced pain is independent of PAF modulation. However, exploratory analysis indicated an association between a larger absolute difference in baseline PAF to 10 Hz (i.e., the rTMS frequency) and higher NRS pain ratings at Day 5 in participants receiving active rTMS. This suggests rTMS is more efficient when delivered close to individual PAF or for those with PAF around 10 Hz, necessitating further exploration of PAF's role in rTMS-induced pain relief.
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EJN is the journal of FENS and supports the international neuroscientific community by publishing original high quality research articles and reviews in all fields of neuroscience. In addition, to engage with issues that are of interest to the science community, we also publish Editorials, Meetings Reports and Neuro-Opinions on topics that are of current interest in the fields of neuroscience research and training in science. We have recently established a series of ‘Profiles of Women in Neuroscience’. Our goal is to provide a vehicle for publications that further the understanding of the structure and function of the nervous system in both health and disease and to provide a vehicle to engage the neuroscience community. As the official journal of FENS, profits from the journal are re-invested in the neuroscientific community through the activities of FENS.
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