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Increased cortical excitability induced by transcranial DC and peripheral nerve stimulation
1Department of Physiology, University of Adelaide, Adelaide SA 5005, Australia.
Journal of Neuroscience Methods
|August 9, 2003
Summary
Combining anodal direct current (DC) stimulation with peripheral ulnar nerve stimulation significantly enhances corticospinal excitability. This combined approach leads to lasting increases in motor evoked potentials, suggesting potential therapeutic applications.
Area of Science:
- Neuroscience
- Motor Control
- Neuromodulation
Background:
- Corticospinal excitability is crucial for motor control.
- Non-invasive brain stimulation techniques are increasingly used to modulate neural activity.
- Understanding the combined effects of different stimulation types is essential for optimizing neuromodulation strategies.
Purpose of the Study:
- To investigate the effects of simultaneous anodal direct current (DC) stimulation and peripheral ulnar nerve (ES) stimulation on corticospinal excitability.
- To determine if combining these stimulation methods yields different outcomes compared to individual stimulation.
- To assess the persistence of any observed changes in corticospinal excitability.
Main Methods:
- Ten healthy subjects participated in the study.
- Four stimulation protocols were tested: no stimulation, DC only, ES only, and combined DC plus ES.
- Motor evoked potentials (MEPs) were recorded from the First Dorsal Interosseous (FDI), Abductor Digiti Minimi (ADM), and Flexor Carpi Ulnaris (FCU) muscles.
- MEP amplitudes were measured at baseline and at intervals up to 30 minutes post-stimulation.
Main Results:
- Neither 'no stimulation' nor 'ES only' protocols induced significant changes in MEP amplitudes.
- Anodal DC stimulation alone caused a temporary, significant increase in FDI MEP amplitude after the second stimulation set, which was not sustained.
- The combined 'DC plus ES' protocol resulted in significant and persistent elevations in FDI MEP amplitude, lasting for at least 30 minutes post-intervention.
Conclusions:
- Simultaneous anodal DC and peripheral ulnar nerve stimulation effectively and persistently enhances corticospinal excitability.
- The preceding anodal DC stimulation appears to potentiate the effects of subsequent ulnar nerve stimulation.
- This combined stimulation approach may offer a promising method for modulating motor cortex excitability for therapeutic purposes.