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Related Experiment Video

Updated: Jul 3, 2026

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease

Published on: July 24, 2019

Dysfunctional turning in Parkinson's disease.

E Stack¹, A Ashburn

¹School of Health Professions & Rehabilitation Science, University of Southampton, UK.

Disability and Rehabilitation

|July 9, 2008

Summary

People with Parkinson's disease (PD) exhibit significant turning asymmetry and difficulty compared to healthy individuals. This turning impairment, particularly left-right asymmetry, correlates with PD severity and may indicate a need for rehabilitation.

Area of Science:

Neurology
Movement Disorders
Biomechanical Analysis

Background:

Turning is a fundamental daily activity that is frequently impaired in individuals with Parkinson's disease (PD).
Impaired turning in PD can manifest as freezing or falling, impacting independence and quality of life.
Understanding the specific characteristics of turning deficits in PD is crucial for developing targeted interventions.

Purpose of the Study:

To comprehensively describe turning differences between individuals with and without PD.
To investigate the extent of left-right asymmetry during turning in PD.
To explore correlations between turning parameters, age, balance, and PD severity using a clinical test.

Main Methods:

A video-based Standing Start 180 degrees Turn Test was administered to 28 individuals with PD and 12 controls.

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Key turning parameters measured included step count, time, and quality (rated 0-5).

Left-right turning agreement was assessed using 95% limits.

Main Results:

Individuals with PD showed significantly more steps, longer turn times, and lower turn quality compared to controls (p < 0.004).
Marked left-right asymmetry in turning was observed in the PD group, with 75% turning 'on-the-spot'.
Turning step count strongly correlated with self-assessed disability in PD (r=0.67) and age in controls (r=0.87).

Conclusions:

Difficulty with turning is prevalent in Parkinson's disease and likely impacts daily activities, suggesting potential benefits from rehabilitation.
Directional asymmetry in turning is a readily identifiable characteristic in PD.
Further research into the diagnostic value of turning asymmetry in Parkinson's disease is warranted.