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Related Concept Videos

Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

538
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
538

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Mild Stroke Affects Pointing Movements Made in Different Frames of Reference.

Fariba Hasanbarani1,2, Marc Aureli Pique Batalla1,2,3, Anatol G Feldman2,4

  • 1School of Physical and Occupational Therapy, McGill University, MontrĂ©al, QC, Canada.

Neurorehabilitation and Neural Repair
|January 30, 2021
PubMed
Summary
This summary is machine-generated.

Individuals with stroke struggle with rapid motor responses to changing task demands in different spatial frames of reference (FRs). These deficits, linked to cognitive impairments, impact daily arm use and require tailored rehabilitation.

Keywords:
kinematicsmotor controlmotor equivalencestrokeupper limb

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Area of Science:

  • Neuroscience
  • Motor Control
  • Rehabilitation Science

Background:

  • Motor performance relies on spatial frames of reference (FRs), including egocentric (body-centered) and exocentric (external space).
  • Stroke survivors often exhibit impaired reaching, potentially due to difficulties with movement production in various FRs.

Purpose of the Study:

  • To investigate rapid motor responses to altered degrees of freedom in different FRs among individuals with mild chronic stroke.
  • To examine the relationship between these motor responses and sensorimotor and cognitive impairments.

Main Methods:

  • Participants (healthy and mild stroke) performed unimanual reaching tasks in egocentric and exocentric FRs without vision.
  • Trunk movement was either free or blocked in randomized trials to manipulate degrees of freedom.

Main Results:

  • Healthy individuals maintained endpoint trajectories by adjusting interjoint coordination (IJC) when the trunk was free or blocked.
  • Stroke survivors showed altered IJC and dissimilar endpoint trajectories, particularly in the exocentric task.
  • Exocentric movement deficits in stroke correlated with cognitive function, not sensorimotor impairment.

Conclusions:

  • Mild stroke impairs rapid adaptation of reaching movements to changing task conditions across different FRs.
  • Cognitive deficits and altered tonic stretch reflex thresholds may underlie these motor control limitations.
  • Rehabilitation should address these specific deficits to improve arm function in daily activities.