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Investigating Transcranial Alternating Current Stimulation (tACS) Preconditioning Effects on Resting and Active Motor Threshold

NCT05503823 · Status: TERMINATED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 6

Last updated 2023-10-06

Study results available
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Summary

Previous studies have looked at the potential of using transcranial direct current stimulation (tDCS) to prime the brain in order to lower the resting motor threshold. The resting motor threshold (RMT) is the intensity at which repeated transcranial magnetic stimulation (rTMS) is applied for treatments. The RMT is the lowest intensity at which the participant's muscle responds with the motor evoked potential peak-to-peak amplitude greater than 50μV for 5 of 10 trials when the hand is relaxed. The active motor threshold (AMT) is the lowest intensity that produces MEP with peak-to-peak amplitude greater than 100 μV for 5 of 10 trials while the participant maintains 10-30% of maximal voluntary contraction. The RMT and AMT is different for each person and the high intensity TMS pulses can be difficult for some of the patients in the current Alzheimer's rTMS treatment study to tolerate. Therefore, if the treatment can still be applied with lower intensities, it would be more tolerable for some people. The limited research on both tDCS and transcranial alternating current stimulation (tACS) in priming the brain for TMS are not enough to determine if they are effective in priming the brain. The studies that include tDCS have small sample size and inconclusive results. The studies with tACS are using very high frequencies of 140 Hz to 250 Hz. The objective of this research study is to determine if priming the brain with tACS at 40 Hz or tRNS for 10 minutes is able to reduce the resting and active motor threshold. Therefore, for people with higher RMT and AMT, priming with tACS or tRNS could be used to lower intensities while stimulating the brain for treatments.

Conditions

  • Understand the Effects of tACS on the Brain

Interventions

DEVICE

tACS or tRNS and TMS

A light electrical current will be applied to the scalp of the participants via 2 electrodes. The resting and active motor threshold will be measured before, right after, after 30 minutes, and after 1 hour of receiving the tACS or tRNS.

Sponsors & Collaborators

  • University of Manitoba

    lead OTHER

Study Design

Allocation
NA
Purpose
BASIC_SCIENCE
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Max Age
95 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2022-09-16
Primary Completion
2023-07-01
Completion
2023-07-01
FDA Device
Yes

Countries

  • Canada

Study Locations

More Related Trials

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05503823 on ClinicalTrials.gov