Dietmann, Anelia; Blanquet, Marisa; Rösler, Kai Michael; Scheidegger, Olivier (2023). Effects of high resistance muscle training on corticospinal output during motor fatigue assessed by transcranial magnetic stimulation. Frontiers in physiology, 14, p. 1125974. Frontiers Research Foundation 10.3389/fphys.2023.1125974
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Introduction: Central fatigue refers to a reduced drive of motor cortical output during exercise, and performance can be enhanced after training. However, the effects of training on central fatigue remain unclear. Changes in cortical output can be addressed non-invasively using transcranial magnetic stimulation (TMS). The aim of the study was to compare responses to TMS during a fatiguing exercise before and after a 3 weeks lasting resistance training, in healthy subjects. Methods: The triple stimulation technique (TST) was used to quantify a central conduction index (CCI = amplitude ratio of central conduction response and peripheral nerve response) to the abductor digiti minimi muscle (ADM) in 15 subjects. The training consisted of repetitive isometric maximal voluntary contractions (MVC) of ADM for 2 min twice a day. Before and after this training, TST recordings were obtained every 15 s during an 2 min exercise of MVC of the ADM, where subjects performed repetitive contractions of the ADM, and repeatedly during a recovery period of 7 min. Results: There was a consistent decrease of force to approximately 40% of MVC in all experiments and in all subjects, both before and after training. In all subjects, CCI decreased during exercise. While before training, theCCI decreased to 49% (SD 23.7%) after 2 min of exercise, it decreased after training onlyto 79% (SD 26.4%) after exercise (p < 0.01). Discussion: The training regimen increased the proportion of target motor units that could be activated by TMS during a fatiguing exercise. The results point to a reduced intracortical inhibition, which may be a transient physiological response to facilitate the motor task. Possible underlying mechanisms at spinal and supraspinal sites are discussed.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic and Interventional Neuroradiology 04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurology |
UniBE Contributor: |
Dietmann, Anelia, Blanquet, Marisa, Rösler, Kai Michael, Scheidegger, Olivier |
Subjects: |
600 Technology > 610 Medicine & health |
ISSN: |
1664-042X |
Publisher: |
Frontiers Research Foundation |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
28 Mar 2023 16:31 |
Last Modified: |
29 Mar 2023 15:29 |
Publisher DOI: |
10.3389/fphys.2023.1125974 |
PubMed ID: |
36969602 |
Uncontrolled Keywords: |
TMS exercise fatigue healthy motor-evoked potentials resistance training |
BORIS DOI: |
10.48350/180772 |
URI: |
https://boris.unibe.ch/id/eprint/180772 |
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