Effect of Metronome-Based Structured Rhythmic Exercise Program on Freezing and Gait Parameters in Parkinson Disease

Background: Parkinson's disease (PD) is a progressive neurodegenerative disorder characterized by the loss of dopaminergic neurons in the substantia nigra pars compacta, leading to motor symptoms such as resting tremor, freezing episodes, gait disturbances, rigidity, and bradykinesia. It is estimated that approximately 6.1 million people worldwide live with PD. With disease progression, freezing episodes and gait impairments intensify, significantly limiting independence and increasing both fall risk and mortality. Although a definitive cure is lacking, symptom management relies on pharmacological and non-pharmacological interventions. In PD patients, adaptability to environmental changes and the ability to process sensory inputs and generate motor responses become impaired. Therefore, sensory re-education using auditory, somatosensory, or visual cues is employed. External cues support motor learning by facilitating initiation and maintenance of movement. By promoting cortical reorganization, these cues can improve gait quality, reduce freezing severity, and enhance participation in daily life. A commonly used method in this context is Rhythmic Auditory Stimulation (RAS). Administered with metronome beats or music, RAS provides external cues via the auditory system to reorganize gait patterns. In patients experiencing freezing, motor blocks during gait can be overcome through rhythmic stimulation. Numerous studies have reported that RAS improves gait speed, step length, and cadence. Despite its benefits, there is a paucity of methodologically robust, standardized trials evaluating the effects of RAS on real-world symptoms such as gait disturbances and freezing. Therefore, there is a clear need for structured interventions based on metronome-driven rhythmic cues and clinical trials assessing their impact. Furthermore, investigating feasibility in home settings via telerehabilitation is valuable for enhancing accessibility of such interventions. Purpose: To assess