Non-Motor and Motor Complications in Parkinson's Disease

Parkinson’s disease is conventionally defined by its cardinal motor features—bradykinesia, rigidity, tremor and postural instability—but its non-motor manifestations are increasingly recognised as equally disabling. As dopaminergic treatment advances, patients may experience motor fluctuations such as wearing-off phenomena and levodopa-induced dyskinesia. These complications arise from both disease progression and pulsatile dopaminergic stimulation, leading to an oscillation between “on” and “off” states that profoundly impacts activities of daily living. Concurrently, non-motor symptoms—including cognitive impairment, mood disturbances, autonomic dysfunction and sleep disorders—often ebb and flow in synchrony with motor fluctuations. This dual burden contributes to reduced quality of life, increased caregiver stress and greater health-care utilisation worldwide. Recent work has emphasised the interdependence of motor and non-motor complications, demonstrating that effective management demands an integrated approach. Interventions range from optimised oral regimens and adjunctive therapies to advanced device-aided treatments, yet gaps persist in objective monitoring and individualised treatment algorithms. Emerging digital health technologies and refined clinical instruments offer promise for real-time assessment of both motor state and non-motor burden, fostering timely treatment adjustments and patient empowerment on a global scale.

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Non-Motor and Motor Complications in Parkinson's Disease publication trend

The graph below shows the total number of articles in non-motor and motor complications in parkinson's disease across all publications each year (not limited to Nature Index journals).

Technical terms

Bradykinesia: Slowness of voluntary movement and a core motor feature of Parkinson’s disease.

Wearing-off: The re-emergence of Parkinsonian symptoms as the effect of a medication dose wanes before the next dose is due.

Dyskinesia: Involuntary, often choreiform, movements resulting from long-term dopaminergic therapy.

Non-motor fluctuations: Variations in non-motor symptoms such as mood, cognition, autonomic and sleep function that coincide with changes in motor state.

Parkinson’s KinetiGraph (PKG): A wrist-worn device that continuously records and quantifies motor parameters over days to evaluate fluctuations and treatment response.

References

1. Application of single wrist-wearable accelerometry for objective motor diary assessment in fluctuating Parkinson’s disease. npj Digital Medicine (2023).
2. Identification and quantitative assessment of motor complications in Parkinson’s disease using the Parkinson’s KinetiGraph™. Frontiers in Aging Neuroscience (2023).
3. Characterization of Non‐Motor Fluctuations Using the Movement Disorder Society Non‐Motor Rating Scale. Movement Disorders Clinical Practice (2022).