Massage as a Form of Neuromodulation to Improve Motor Control and Gait in Parkinson's Disease

Alice Weber, Anne Weisman

DOI: Pending DOI

Synopsis

Parkinson's disease (PD) disrupts motor control, and current pharmacologic treatments offer symptomatic relief without normalizing underlying circuit dynamics. Massage may represent a form of peripheral neuromodulation by activating mechanoreceptors and proprioceptors, thereby influencing sensorimotor integration and motor circuit function. Prior massage studies in PD have not combined motor outcomes with electroencephalography (EEG) markers of circuit-level pathology. This study randomly assigns 40 participants with PD to a 12-week massage intervention or control group. Outcomes include clinical motor assessments and EEG measures of beta-band oscillatory activity associated with PD motor dysfunction. We expect massage to improve motor performance and normalize motor-related beta dynamics.

Background

Nearly 12 million people worldwide have Parkinson's disease (PD),1 characterized by progressive dopaminergic neurodegeneration causing motor and gait dysfunction2. Pharmacologic treatments such as levodopa only partially alleviate symptoms and diminish in efficacy over time2, motivating non-pharmacologic adjunct therapies.

While not traditionally considered a neuromodulatory technique, massage provides structured stimulation of cutaneous mechanoreceptors and proprioceptors, which activate afferent pathways projecting to spinal and supraspinal motor circuits3. Enhanced proprioceptive input upregulates neurotrophin-3 and brain-derived neurotrophic factor in motor circuitry4, and massage increases circulating dopamine levels5, suggesting a mechanistic pathway for mechanosensory peripheral stimulation to influence neurotrophic and dopaminergic signaling in PD.

Prior massage studies in PD have not systematically paired objective motor assessments with neurophysiological measures of motor circuit function6,7,8, limiting translation to clinical practice. Beta synchrony in basal ganglia motor circuits is a well-established correlate of PD motor dysfunction9, historically measured through invasive deep brain recordings10. Recent research demonstrates that this subcortical activity produces cortical signatures accessible non-invasively via scalp electroencephalography (EEG) and magnetoencephalography (MEG)11. Sensorimotor cortical alterations in beta burst duration12,13,14, phase-amplitude coupling15,16, and waveform asymmetry16 provide a window into Parkinsonian motor circuit states.

Methods

This controlled study enrolls 40 individuals with idiopathic PD, randomly assigned to a massage intervention group (n=20) or a standard-care control group (n=20). Inclusion criteria include confirmed PD diagnosis, stable medication regimen, and ability to participate in motor testing and EEG. Participants with severe cognitive impairment or medical contraindications are excluded.

The massage intervention consists of a 45-minute standardized weekly session for 12 consecutive weeks, delivered by the first author, a licensed massage therapist. The protocol incorporates full-body Swedish massage, with emphasis on proprioceptive stimulation of muscles and tendons and cutaneous mechanoreceptor engagement. Rolling enrollment does not exceed 10 active participants per week.

Motor and gait performance is assessed at baseline and post-intervention using validated clinical measures, including the Timed Up and Go, gait speed, sit-to-stand performance, functional balance and coordination, and upper-limb fine motor tasks, administered in consultation with a neurologist6,7.

EEG is collected at baseline and post-intervention to examine motor-related cortical activity. Analyses focus on beta power, burst duration, phase-amplitude coupling, and waveform shape asymmetry in sensorimotor regions during standardized motor tasks10,12,13,14,15,16. Pre-to-post-intervention changes are compared between groups using repeated-measures statistical models. Figure 1 depicts EEG detection of basal ganglia-thalamo-cortical beta activity, illustrating waveform asymmetry as one of four EEG outcome measures.

Results

This study is ongoing; results reported here reflect expected outcomes based on prior literature and the mechanistic rationale motivating the study design.

With respect to motor and gait outcomes, participants receiving massage are expected to demonstrate improvements across all primary measures of motor function relative to controls. Prior research suggests massage in PD may improve motor symptoms8, with meta-analytic evidence indicating specific benefits including reduced rigidity, improved balance, increased gait speed, and improved clinical ratings of motor symptoms6. A randomized controlled trial of Thai massage further demonstrated significant improvements in upper limb strength relative to controls 7. Based on this evidence, consistent improvements are anticipated across Timed Up and Go, gait speed, balance, sit-to-stand, and fine motor outcomes.

With respect to neurophysiological outcomes, participants receiving massage are expected to demonstrate normalization of beta oscillatory dynamics compared to controls. Pathological beta synchrony, typically observed via deep brain recordings, is a key biomarker of PD motor dysfunction9. Scalp EEG and MEG provide non-invasive access to cortical signatures of this activity, enabling measurement of basal ganglia-thalamo-cortical motor circuit dysfunction without implanted electrodes 12,13,14,16.

In healthy individuals, beta power in the sensorimotor cortex decreases during motor planning and execution11. In PD, this suppression fails, but the pathology does not simply manifest as sustained elevated beta power at the cortex. In fact, cortical beta power has been shown to be an unreliable standalone biomarker of PD motor dysfunction13. Instead, the disruption is expressed in sensorimotor cortical beta dynamics, producing measurable changes in burst structure, phase coupling and waveform morphology.

Subcortical burst duration correlates with motor impairment severity in PD and is reduced by dopaminergic medication alongside motor improvement10. Subcortical beta bursts drive cortical network formation through cortico-subthalamic coupling17. These subcortical burst duration dynamics produce observable changes in burst duration in the sensorimotor cortex in PD, which are modulated by effective treatment14. Beta-gamma phase-amplitude coupling (PAC), in which the phase of beta oscillations modulates the amplitude of gamma activity, is also observable in the cortex and is strongly correlated with Parkinsonian motor symptoms15,16. Additionally, waveform shape asymmetry of beta oscillations in the sensorimotor cortex has been shown to distinguish individuals with PD from healthy controls and track dopaminergic medication state16.

It is predicted that massage will modulate motor circuits, with expected reductions in burst duration, attenuated PAC and normalization of waveform asymmetry in sensorimotor regions relative to controls. Beta power is tracked alongside these measures as a contextual index of cortical desynchronization. Expected convergence of motor improvements with EEG-indexed reductions in dysregulated beta activity would constitute preliminary evidence that massage-associated motor gains reflect changes in cortical motor circuit dynamics, representing the primary integrative outcome of this study.

Discussion

The lack of comparative neurophysiological data with clinical motor measures in prior massage and PD literature limits mechanistic interpretation and translation to clinical practice6,7,8. If massage improves motor outcomes alongside reductions in pathological beta dynamics in PD, this would provide preliminary evidence that manual mechanosensory input can modulate motor circuits, supporting characterization of massage as a form of peripheral neuromodulation, and providing rationale for integrating massage into PD care.

Massage-induced elevation of circulating dopamine5, a known regulator of basal ganglia-thalamo-cortical beta synchrony9,10, may provide a secondary mechanism linking peripheral mechanosensory stimulation to central motor circuit modulation.

Lymphatic drainage may represent an additional mechanistic pathway of massage in modulating PD neuropathology. Meningeal lymphatic drainage is impaired in PD, which may contribute to alpha-synuclein accumulation and neurodegeneration18,19. Whether massage supports glymphatic clearance of alpha-synuclein and drainage through meningeal lymphatic vessels into cervical lymph nodes20 warrants investigation.

This protocol could be disseminated to community practitioners, broadening adjunct treatment options for individuals with PD worldwide. Future work should examine optimal dosing, durability of effects, and integration with pharmacologic or device-based neuromodulation.

Disclosures

This study is supported by a Graduate Student Research Award from the University of Nevada Las Vegas. Nothing to disclose by any author(s).

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