Saudi Cultural Missions Theses & Dissertations
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Item Restricted The Effect of Repetitive Peripheral Magnetic Stimulation on Cortical Excitability and Motor Performance(Saudi Digital Library, 2024-10-17) Aljuhni, Rehab; Madhavan, SangeethaThe aim of this dissertation was to investigate the effects of repetitive peripheral magnetic stimulation (rPMS) as a sensory-based priming technique on lower limb corticomotor excitability (CME) and motor skill performance in both stroke-affected and healthy individuals. Our primary goal was to ascertain the duration-dependent effects of rPMS on lower limb CME in healthy participants and lower limb motor skill performance in individuals with stroke. rPMS was administered to the belly of the TA muscle at 10% above motor threshold (MT). Each participant received approximately 2400 pulses delivered at a frequency of 20 Hz for 3 seconds, followed by a 19-second rest period. We employed transcranial magnetic stimulation to evaluate alterations in CME following a single application of rPMS. Our findings revealed a significant increase in the motor evoked potential (MEP) amplitude of the stimulated TA; however, no changes were observed in MEP latency or MEP duration. Moreover, we employed a custom-built ankle device to assess lower limb motor skill performance, comparing the effects of rPMS with Sham stimulation. The Sham stimulation was applied to the dorsal part of the foot at minimal intensity. Our results suggest that rPMS did not induce any significant changes in motor skill performance for individuals with stroke compared to sham stimulation. In conclusion, rPMS shows promise in enhancing MEP amplitude in the motor cortex, but it demonstrates limited effectiveness in improving complex tasks such as motor skill performance. Future research should focus on establishing a standardized protocol for rPMS applications.26 0