Effects of Peripheral Magnetic Stimulation on Cortical Excitability in Healthy Individuals

Effects of Peripheral Magnetic Stimulation on Cortical Excitability in Healthy Individuals

This study investigates the immediate effects of different parameters (frequency, intensity, and pulse number) of peripheral magnetic stimulation (rPMS) on cortical excitability in healthy individuals. Using a randomized, double-blind crossover design, the research aims to identify optimal stimulation protocols for modulating neural activity. Outcomes include measurements of motor-evoked potentials (MEPs), intracortical inhibition (ICI), and facilitation (ICF). Findings may enhance non-invasive therapeutic strategies for neurological disorders.

This clinical trial is a crossover trial comparing 9 single-session rPMS protocols over the extensor carpi radialis muscle, testing three frequencies (1Hz, 10Hz, 25Hz), intensities (90%, 100%, 110% of resting motor threshold) across sequential phases.

Participants: Healthy adults (18-40 years) undergo pre-/post-intervention assessments: cortical (MEPs, ICI/ICF) excitability.

Design: Crossover, double-blind.

Analysis: ANOVA or Friedman tests (SPSS v20.0; α=0.05).

Significance: Clarifies parameter-specific neuromodulatory effects, guiding future rehabilitation protocols for neurological conditions.

Ethics: Approved by Federal University of Pernambuco's ethics committee (Resolution 466/12). Data stored securely for 5 years.

Inclusion criteria: Healthy adults aged 18-40 years, both sexes, right-handed (confirmed via Edinburgh Handedness Inventory), and for females, consistent use of contraceptive medication to mitigate hormonal influences on nervous system excitability.

Exclusion criteria: Pregnancy; history of seizures or epilepsy; metallic implants in the head, spine, face, or heart; diagnosed neurological or musculoskeletal conditions interfering with assessments or interventions; or use of substances altering nervous system excitability.