time-course of corticospinal excitability and autonomic function interplay during and following monopolar tdcs
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2014
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Abstract
While polarity-specific after-effects of monopolar transcranial direct current stimulation (tDCS) on cortico-spinal excitability are well-documented, modulation of vital parameters due to current spread through the brainstem is still a matter of debate, raising potential concerns about its use through the general public, as well as for neurorehabilitation purposes. We monitored online and after-effects of monopolar tDCS (primary motor cortex) in ten healthy subjects by adopting a neuronavigated transcranial magnetic stimulation (TMS)/tDCS combined protocol. Motor evoked potentials (MEPs) together with vital parameters (e.g. blood pressure, heart-rate variability and sympathovagal balance) were recorded and monitored before, during and after anodal, cathodal or sham tDCS. Ten MEPs every 2.5-minute time windows were recorded from the right First Dorsal Interosseus (FDI), while 5-minute epochs were used to record vital parameters. The protocol included 15 minutes of pre-tDCS and of online-tDCS, (anodal, cathodal or sham). After effects were recorded for 30 minutes. We showed a polarity-independent stabilization of cortical excitability level, a polarity-specific after-effects for cathodal and anodal stimulation, and an absence of persistent excitability changes during online stimulation. No significant effects on vital parameters emerged both during and after tDCS, while a linear increase in systolic/diastolic blood pressure and heart-rate variability was observed during each tDCS condition, as a possible unspecific response to experimental demands. Taken together, current findings provide new insights on the safety of monopolar tDCS, promoting its application both in research and clinical settings.
| Reference Key |
esantarnecchi2014frontierstime-course
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| Authors | ;Emiliano eSantarnecchi;Matteo eFeurra;Federico eBarneschi;Maurizio eAcampa;Giovanni eBianco;David eCioncoloni;Alessandro eRossi;Simone eRossi |
| Journal | journal of experimental psychology general |
| Year | 2014 |
| DOI |
10.3389/fpsyt.2014.00086
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