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Abnormal force patterns for multidirectional postural responses in patients with Parkinson's disease.
Diana Dimitrova1, John Nutt, Fay B Horak
1Neurological Sciences Institute, Oregon Health & Science University, Portland, Oregon, USA.
Experimental Brain Research
|March 3, 2004
Summary
Parkinson's disease (PD) impairs the basal ganglia's ability to optimize postural responses. PD patients showed abnormal reactive forces and symmetric leg use, unlike controls, highlighting basal ganglia
Area of Science:
- Neuroscience
- Biomechanics
- Motor Control
Background:
- The basal ganglia play a crucial role in motor control and movement.
- Postural stability relies on complex sensorimotor integration.
- Parkinson's disease (PD) is associated with significant motor deficits, including impaired balance.
Purpose of the Study:
- To investigate the role of the basal ganglia in optimizing automatic postural responses.
- To compare postural responses to directional surface perturbations between Parkinson's disease (PD) subjects and controls.
- To examine the influence of stance width on postural adjustments in PD.
Main Methods:
- Subjects with PD and age-matched controls performed postural tasks involving surface translations in eight directions.
- Ground reactive forces (horizontal and vertical) were measured under each leg.
- Stance width was manipulated (narrow and wide).
Main Results:
- Parkinson's disease (PD) subjects exhibited larger passive forces but weaker, abnormally directed active forces.
- Unlike controls who used loaded limbs, PD subjects employed both legs symmetrically for equilibrium recovery.
- PD subjects failed to adjust reactive forces based on initial stance width.
Conclusions:
- The basal ganglia are critical for optimizing automatic postural responses to varying perturbation directions.
- The basal ganglia are important for adapting postural strategies based on initial stance conditions.
- Impaired basal ganglia function in PD leads to deficits in adaptive postural control.