rantalainen-shortinterval-2013.pdf (1.57 MB)
Download fileShort-interval intracortical inhibition is not affected by varying visual feedback in an isometric task in biceps brachiii muscle
journal contribution
posted on 2013-03-08, 00:00 authored by Timo RantalainenTimo Rantalainen, Ashleigh Weier, Michael Leung, C Brandner, Michael Spittle, Dawson KidgellPurpose : To establish if visual feedback and force requirements influence SICI.
Methods : SICI was assessed from 10 healthy adults (5 males and 5 females aged between 21 and 35 years) in three submaximal isometric elbow flexion torque levels [5, 20, and 40% of maximal voluntary contraction (MVC)] and with two tasks differing in terms of visual feedback. Single-pulse and paired-pulse motor-evoked potentials (MEPs), supramaximal M-wave, and background surface electromyogram (sEMG) were recorded from the biceps brachii muscle.
Results : Repeated measures MANOVA was used for statistical analyses. Background sEMG did not differ between tasks (F = 0.4, P = 0.68) nor was task × torque level interaction observed (F = 1.2, P = 0.32), whereas background sEMG increased with increasing torque levels (P = 0.001). SICI did not differ between tasks (F = 0.9, P = 0.43) and no task × torque level interaction was observed (F = 2.3, P = 0.08). However, less SICI was observed at 40% MVC compared to the 5 and 20% MVC torque levels (P = 0.01–0.001).
Conclusion : SICI was not altered by performing the same task with differing visual feedback. However, SICI decreased with increasing submaximal torque providing further evidence that SICI is one mechanism of modulating cortical excitability and plays a role in force gradation.
Methods : SICI was assessed from 10 healthy adults (5 males and 5 females aged between 21 and 35 years) in three submaximal isometric elbow flexion torque levels [5, 20, and 40% of maximal voluntary contraction (MVC)] and with two tasks differing in terms of visual feedback. Single-pulse and paired-pulse motor-evoked potentials (MEPs), supramaximal M-wave, and background surface electromyogram (sEMG) were recorded from the biceps brachii muscle.
Results : Repeated measures MANOVA was used for statistical analyses. Background sEMG did not differ between tasks (F = 0.4, P = 0.68) nor was task × torque level interaction observed (F = 1.2, P = 0.32), whereas background sEMG increased with increasing torque levels (P = 0.001). SICI did not differ between tasks (F = 0.9, P = 0.43) and no task × torque level interaction was observed (F = 2.3, P = 0.08). However, less SICI was observed at 40% MVC compared to the 5 and 20% MVC torque levels (P = 0.01–0.001).
Conclusion : SICI was not altered by performing the same task with differing visual feedback. However, SICI decreased with increasing submaximal torque providing further evidence that SICI is one mechanism of modulating cortical excitability and plays a role in force gradation.
History
Journal
Frontiers in human neuroscienceVolume
7Season
Article 68Pagination
1 - 8Publisher
Frontiers Research FoundationLocation
Lausanne, SwitzerlandPublisher DOI
ISSN
1662-5161Language
engPublication classification
C1 Refereed article in a scholarly journal; C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2013, FrontiersUsage metrics
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Categories
Keywords
transcranial magnetic stimulationprimary motor cortextask specificityforce gradationmotor controlScience & TechnologySocial SciencesLife Sciences & BiomedicineNeurosciencesPsychologyNeurosciences & NeurologyCORTICOMOTOR EXCITABILITYCORTICOSPINAL INPUTSCORTICAL PLASTICITYCONTRACTIONMODULATIONHUMANSFORCERESPONSES