Transcranial direct current stimulation of primary motor cortex modulates post-contraction potentiation
Surface electromyographic activity (sEMG) of the biceps brachii (BB) during weak elbow flexion has been reported to immediately increase after strong elbow flexion even while exerting consistent force; this phenomenon is called “post-contraction potentiation” (PCP). To determine whether the central...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Japanese Society of Physical Fitness and Sports Medicine
2021-01-01
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| Series: | Journal of Physical Fitness and Sports Medicine |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jpfsm/10/1/10_13/_pdf/-char/en |
| _version_ | 1818929048997330944 |
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| author | Tomoya Ishii Syusaku Sasada Shinya Suzuki Tomoyoshi Komiyama |
| author_facet | Tomoya Ishii Syusaku Sasada Shinya Suzuki Tomoyoshi Komiyama |
| author_sort | Tomoya Ishii |
| collection | DOAJ |
| description | Surface electromyographic activity (sEMG) of the biceps brachii (BB) during weak elbow flexion has been reported to immediately increase after strong elbow flexion even while exerting consistent force; this phenomenon is called “post-contraction potentiation” (PCP). To determine whether the central nervous system is involved in PCP, we investigated the effect of transcranial direct current stimulation (tDCS) and transcranial magnetic stimulation (TMS) of the primary motor cortex (M1) during PCP. Initially, the participants were instructed to perform successive muscle contraction tasks with different forces: 2% (Test 1); then 25%, 50%, or 100% (conditioning contraction [CC]); and again 2% (Test 2) of maximum voluntary contraction (MVC). In subsequent experiments, the CC intensity was set at 50% MVC, and tDCS (anodal, cathodal, and sham) was applied to the M1 before the task. In the last experiment, TMS was applied to M1 to evaluate the excitability of the corticospinal tract during Tests 1 and 2. The CC intensity at 50% or 100% MVC generated PCP, but didn’t at 25% MVC. Anodal tDCS significantly decreased the magnitude of PCP, while cathodal tDCS showed an increase in magnitude compared to sham tDCS. The BB motor-evoked potential amplitude during Test 2 was lower compared to that during Test 1. These findings suggest that changes in the excitability of the corticospinal tract and resultant changes in the activation pattern of motor unit activity play a role in generating PCP. |
| first_indexed | 2024-12-20T03:38:37Z |
| format | Article |
| id | doaj.art-ede5a9c76957451ea1ec3211ed8dd81a |
| institution | Directory Open Access Journal |
| issn | 2186-8131 2186-8123 |
| language | English |
| last_indexed | 2024-12-20T03:38:37Z |
| publishDate | 2021-01-01 |
| publisher | Japanese Society of Physical Fitness and Sports Medicine |
| record_format | Article |
| series | Journal of Physical Fitness and Sports Medicine |
| spelling | doaj.art-ede5a9c76957451ea1ec3211ed8dd81a2022-12-21T19:54:48ZengJapanese Society of Physical Fitness and Sports MedicineJournal of Physical Fitness and Sports Medicine2186-81312186-81232021-01-01101132310.7600/jpfsm.10.13jpfsmTranscranial direct current stimulation of primary motor cortex modulates post-contraction potentiationTomoya Ishii0Syusaku Sasada1Shinya Suzuki2Tomoyoshi Komiyama3Division of Health and Sports Education, The United Graduate School of Education, Tokyo Gakugei UniversityDepartment of Food and Nutrition Science, Sagami Women’s UniversityDepartment of Physical Therapy, School of Rehabilitation Sciences, Health Sciences University of HokkaidoDivision of Health and Sports Education, The United Graduate School of Education, Tokyo Gakugei UniversitySurface electromyographic activity (sEMG) of the biceps brachii (BB) during weak elbow flexion has been reported to immediately increase after strong elbow flexion even while exerting consistent force; this phenomenon is called “post-contraction potentiation” (PCP). To determine whether the central nervous system is involved in PCP, we investigated the effect of transcranial direct current stimulation (tDCS) and transcranial magnetic stimulation (TMS) of the primary motor cortex (M1) during PCP. Initially, the participants were instructed to perform successive muscle contraction tasks with different forces: 2% (Test 1); then 25%, 50%, or 100% (conditioning contraction [CC]); and again 2% (Test 2) of maximum voluntary contraction (MVC). In subsequent experiments, the CC intensity was set at 50% MVC, and tDCS (anodal, cathodal, and sham) was applied to the M1 before the task. In the last experiment, TMS was applied to M1 to evaluate the excitability of the corticospinal tract during Tests 1 and 2. The CC intensity at 50% or 100% MVC generated PCP, but didn’t at 25% MVC. Anodal tDCS significantly decreased the magnitude of PCP, while cathodal tDCS showed an increase in magnitude compared to sham tDCS. The BB motor-evoked potential amplitude during Test 2 was lower compared to that during Test 1. These findings suggest that changes in the excitability of the corticospinal tract and resultant changes in the activation pattern of motor unit activity play a role in generating PCP.https://www.jstage.jst.go.jp/article/jpfsm/10/1/10_13/_pdf/-char/enpost-contraction potentiationtranscranial direct current stimulationtranscranial magnetic stimulationconditioning contraction |
| spellingShingle | Tomoya Ishii Syusaku Sasada Shinya Suzuki Tomoyoshi Komiyama Transcranial direct current stimulation of primary motor cortex modulates post-contraction potentiation Journal of Physical Fitness and Sports Medicine post-contraction potentiation transcranial direct current stimulation transcranial magnetic stimulation conditioning contraction |
| title | Transcranial direct current stimulation of primary motor cortex modulates post-contraction potentiation |
| title_full | Transcranial direct current stimulation of primary motor cortex modulates post-contraction potentiation |
| title_fullStr | Transcranial direct current stimulation of primary motor cortex modulates post-contraction potentiation |
| title_full_unstemmed | Transcranial direct current stimulation of primary motor cortex modulates post-contraction potentiation |
| title_short | Transcranial direct current stimulation of primary motor cortex modulates post-contraction potentiation |
| title_sort | transcranial direct current stimulation of primary motor cortex modulates post contraction potentiation |
| topic | post-contraction potentiation transcranial direct current stimulation transcranial magnetic stimulation conditioning contraction |
| url | https://www.jstage.jst.go.jp/article/jpfsm/10/1/10_13/_pdf/-char/en |
| work_keys_str_mv | AT tomoyaishii transcranialdirectcurrentstimulationofprimarymotorcortexmodulatespostcontractionpotentiation AT syusakusasada transcranialdirectcurrentstimulationofprimarymotorcortexmodulatespostcontractionpotentiation AT shinyasuzuki transcranialdirectcurrentstimulationofprimarymotorcortexmodulatespostcontractionpotentiation AT tomoyoshikomiyama transcranialdirectcurrentstimulationofprimarymotorcortexmodulatespostcontractionpotentiation |