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Nguyen DTA, Julkunen P, Säisänen L, Määttä S, Rissanen SM, Lintu N, Könönen M, Lakka T, Karjalainen PA. Developmental models of motor-evoked potential features by transcranial magnetic stimulation across age groups from childhood to adulthood. Sci Rep 2023; 13:10604. [PMID: 37391521 PMCID: PMC10313665 DOI: 10.1038/s41598-023-37775-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 06/27/2023] [Indexed: 07/02/2023] Open
Abstract
To derive the maturation of neurophysiological processes from childhood to adulthood reflected by the change of motor-evoked potential (MEP) features. 38 participants were recruited from four groups (age mean in years [SD in months], number (males)): children (7.3 [4.2], 7(4)), preadolescents (10.3 [6.9], 10(5)), adolescents (15.3 [9.8], 11(5)), and adults (26.9 [46.2], 10(5)). The navigated transcranial magnetic stimulation was performed on both hemispheres at seven stimulation intensity (SI) levels from sub- to supra-threshold and targeted to the representative cortical area of abductor pollicis brevis muscle. MEPs were measured from three hand- and two forearm-muscles. The input-output (I/O) curves of MEP features across age groups were constructed using linear mixed-effect models. Age and SI significantly affected MEP features, whereas the stimulated side had a minor impact. MEP size and duration increased from childhood to adulthood. MEP onset- and peak-latency dropped in adolescence, particularly in hand muscles. Children had the smallest MEPs with the highest polyphasia, whereas I/O curves were similar among preadolescents, adolescents, and adults. This study illustrates some of the changing patterns of MEP features across the ages, suggesting developing patterns of neurophysiological processes activated by TMS, and to motivate studies with larger sample size.
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Affiliation(s)
- Dao T A Nguyen
- Department of Technical Physics, University of Eastern Finland, POB 1627, 70211, Kuopio, Finland.
| | - Petro Julkunen
- Department of Technical Physics, University of Eastern Finland, POB 1627, 70211, Kuopio, Finland
- Department of Clinical Neurophysiology, Kuopio University Hospital, POB 100, 70029 KYS, Kuopio, Finland
| | - Laura Säisänen
- Department of Technical Physics, University of Eastern Finland, POB 1627, 70211, Kuopio, Finland
- Department of Clinical Neurophysiology, Kuopio University Hospital, POB 100, 70029 KYS, Kuopio, Finland
| | - Sara Määttä
- Department of Clinical Neurophysiology, Kuopio University Hospital, POB 100, 70029 KYS, Kuopio, Finland
| | - Saara M Rissanen
- Department of Technical Physics, University of Eastern Finland, POB 1627, 70211, Kuopio, Finland
| | - Niina Lintu
- Institute of Biomedicine, University of Eastern Finland, POB 162, 70211, Kuopio, Finland
| | - Mervi Könönen
- Department of Technical Physics, University of Eastern Finland, POB 1627, 70211, Kuopio, Finland
| | - Timo Lakka
- Institute of Biomedicine, University of Eastern Finland, POB 162, 70211, Kuopio, Finland
- Department of Clinical Physiology and Nuclear Medicine, Kuopio University Hospital, POB 100, 70029 KYS, Kuopio, Finland
- Foundation for Research in Health Exercise and Nutrition, Kuopio Research Institute of Exercise Medicine, Haapaniementie 16, 70100, Kuopio, Finland
| | - Pasi A Karjalainen
- Department of Technical Physics, University of Eastern Finland, POB 1627, 70211, Kuopio, Finland
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