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Related Concept Videos

Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
Parkinson Disease l: Introduction01:24

Parkinson Disease l: Introduction

Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of which...
Parkinson's Disease: Treatment01:24

Parkinson's Disease: Treatment

Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...
Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is to...
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...

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Related Experiment Video

Updated: Jul 4, 2026

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease
10:28

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

Published on: July 24, 2019

Parkinsonian arm movements as altered by task difficulty.

P Weiss1, G E Stelmach, C H Adler

  • 1Department of Neurology, Mayo Clinic, Scottsdale, AZ 85259, U.S.A.

Parkinsonism & Related Disorders
|October 1, 1996
PubMed
Summary

Parkinson's disease (PD) patients exhibit impaired arm movement control, particularly with larger movements. Reduced force regulation capability contributes to their characteristic slowness.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Movement Science

Background:

  • Parkinson's disease (PD) is a neurodegenerative disorder affecting motor control.
  • Understanding kinematic changes in PD is crucial for developing effective interventions.
  • Fitts' law describes the relationship between movement speed and accuracy.

Purpose of the Study:

  • To investigate the kinematic organization of discrete elbow movements in young, elderly, and Parkinson's disease (PD) groups.
  • To determine how task difficulty (index of difficulty, ID) influences arm movement kinematics in these groups.
  • To identify specific motor control deficits in PD patients during arm movements.

Main Methods:

  • Participants performed discrete elbow movements towards targets of varying sizes and amplitudes.
  • Movement kinematics, including velocity and acceleration, were analyzed.
  • Data were analyzed in the context of Fitts' law to assess speed-accuracy trade-offs.
  • Comparison of kinematic parameters across young, elderly, and PD groups.

Main Results:

  • All groups demonstrated adherence to Fitts' law, with kinematics modified by target size and movement amplitude.
  • Increased task demands (smaller targets) revealed differential effects on velocity and acceleration modulation in PD patients.
  • PD patients showed reduced ability to increase velocity and acceleration for large amplitude movements under reduced accuracy constraints.
  • Speed scaling was preserved for small movement amplitudes in PD patients.

Conclusions:

  • Parkinson's disease impairs the ability to modulate movement velocity and acceleration, especially for larger amplitude movements.
  • A reduced capability to initiate and regulate force is likely the underlying cause of slowness in PD.
  • These findings highlight specific motor control deficits in PD that may inform therapeutic strategies.