Non-Invasive Brain Stimulation Combined with Exercise: Synergistic Neuroplasticity in Parkinson’s disease: A comprehensive Review

Motor and non-motor deficits resulting from dopaminergic neuron loss are hallmarks of Parkinson's disease (PD), a progressive neurodegenerative illness. Non-pharmacological therapies that encourage neuroplasticity are becoming more popular since, despite their ability to alleviate symptoms, pharmaceutical treatments are unable to stop the progression of the disease. Among these, non-invasive brain stimulation (NIBS) and exercise have shown promise. Exercise, especially aerobic, resistance, and task-specific training, improves motor and cognitive abilities by increasing cerebral perfusion, synaptic plasticity, and brain-derived neurotrophic factor (BDNF) levels. Similarly, long-term potentiation (LTP)-related mechanisms can be facilitated and cortical excitability modulated by NIBS techniques such as recurrent transcranial magnetic stimulation (rTMS) and transcranial direct current stimulation (tDCS). Although their effects are minimal when taken separately, new research indicates that NIBS and exercise may work in concert to improve neuroplastic responses during recovery. The data currently available on the neurobiological processes and therapeutic effects of combined NIBS-exercise therapies in Parkinson's disease is summarized in this review. Along with results from clinical trials showing improved gait, balance, motor performance, and executive function, it talks about their common routes, which include increased BDNF signaling, cortico-striatal connection, and dopaminergic modulation. The necessity of individualized treatment approaches is emphasized by addressing methodological limitations, such as protocol variability and patient responsiveness. Overall, by utilizing synergistic plasticity mechanisms, NIBS and exercise together offer a viable non-invasive method to enhance neurorehabilitation in Parkinson's disease. To comprehend long-term consequences and enhance methods, more research is required.