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Proprioceptive Thresholds Are Indicators of Upper Limb Perception After Stroke
Joanna E Hoh1,2, Stephen H Scott3,4, Sean P Dukelow5
1Biomechanics and Movement Science Program, University of Delaware, Newark, DE, USA.
Neurorehabilitation and Neural Repair
|August 22, 2025
Summary
Proprioceptive impairments after stroke are common. A new movement discrimination threshold (MDT) test accurately measures these sensory deficits, which may be separate from motor function loss.
Area of Science:
- Neuroscience
- Rehabilitation Medicine
- Biomechanics
Background:
- Proprioception is essential for daily function and frequently impaired post-stroke, particularly in the upper limb.
- While upper limb proprioceptive deficits are recognized, their relationship with motor function remains underexplored.
Purpose of the Study:
- To investigate the correlation between proprioceptive detection thresholds (movement discrimination thresholds [MDTs]) and established measures of upper limb proprioception, motor control, and clinical function in stroke survivors.
Main Methods:
- Stroke (N=39) and control (N=39) participants performed five robotic tasks using the Kinarm Exoskeleton Lab.
- Tasks included assessing movement detection threshold (MDT), static position sense (Position Matching), sense of limb motion (Kinesthetic Matching), and upper limb motor control (Visually Guided Reaching, Reaching without Vision).
Main Results:
- Stroke participants exhibited significant impairments across all robotic tasks compared to controls.
- MDT showed significant correlations with robotic measures of proprioception (Position Matching, Kinesthetic Matching) but not with motor control tasks or clinical assessments.
Conclusions:
- The single-arm MDT measure, with reduced motor demands, correlates well with existing robotic proprioception assessments.
- MDT can identify perceptual deficits that may be independent of motor function impairments following stroke.
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