13 Citations (Scopus)

Abstract

Objective: The ability to adapt digit forces to object properties requires both anticipatory and feedback-driven control mechanisms which can be disrupted in individuals with a compromised sensorimotor system. Carpal tunnel syndrome (CTS) is a median nerve compression neuropathy affecting sensory and motor function in a subset of digits in the hand. Our objective was to examine how CTS patients coordinate anticipatory and feedback-driven control for multi-digit grip force adaptation. Methods: We asked CTS patients and healthy controls to grasp, lift, and hold an object with different textures. Results: CTS patients effectively adapted their digit forces to changes in object texture, but produced excessive grip forces. CTS patients also produced larger peak force rate profiles with fewer modulations of normal force prior to lift onset than did controls and continued to increase grip force throughout the lift whereas forces were set at lift onset for the controls. Conclusions: These findings suggest that CTS patients use less online sensory feedback for fine-tuning their grip forces, relying more on anticipatory control than do healthy controls. Significance: These characteristics in force adaptation in CTS patients indicate impaired sensorimotor control which leads to excessive grip forces with the potential to further exacerbate their median nerve compression.

Original languageEnglish (US)
Pages (from-to)2281-2290
Number of pages10
JournalClinical Neurophysiology
Volume123
Issue number11
DOIs
StatePublished - Nov 2012

Fingerprint

Carpal Tunnel Syndrome
Hand Strength
Median Nerve
Sensory Feedback
Aptitude
Hand

Keywords

  • Carpal tunnel syndrome
  • Manipulation
  • Sensorimotor processes
  • Texture

ASJC Scopus subject areas

  • Clinical Neurology
  • Neurology
  • Physiology (medical)
  • Sensory Systems

Cite this

Effects of carpal tunnel syndrome on adaptation of multi-digit forces to object texture. / Afifi, Mostafa; Santello, Marco; Johnston, Jamie A.

In: Clinical Neurophysiology, Vol. 123, No. 11, 11.2012, p. 2281-2290.

Research output: Contribution to journalArticle

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AU - Afifi, Mostafa

AU - Santello, Marco

AU - Johnston, Jamie A.

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N2 - Objective: The ability to adapt digit forces to object properties requires both anticipatory and feedback-driven control mechanisms which can be disrupted in individuals with a compromised sensorimotor system. Carpal tunnel syndrome (CTS) is a median nerve compression neuropathy affecting sensory and motor function in a subset of digits in the hand. Our objective was to examine how CTS patients coordinate anticipatory and feedback-driven control for multi-digit grip force adaptation. Methods: We asked CTS patients and healthy controls to grasp, lift, and hold an object with different textures. Results: CTS patients effectively adapted their digit forces to changes in object texture, but produced excessive grip forces. CTS patients also produced larger peak force rate profiles with fewer modulations of normal force prior to lift onset than did controls and continued to increase grip force throughout the lift whereas forces were set at lift onset for the controls. Conclusions: These findings suggest that CTS patients use less online sensory feedback for fine-tuning their grip forces, relying more on anticipatory control than do healthy controls. Significance: These characteristics in force adaptation in CTS patients indicate impaired sensorimotor control which leads to excessive grip forces with the potential to further exacerbate their median nerve compression.

AB - Objective: The ability to adapt digit forces to object properties requires both anticipatory and feedback-driven control mechanisms which can be disrupted in individuals with a compromised sensorimotor system. Carpal tunnel syndrome (CTS) is a median nerve compression neuropathy affecting sensory and motor function in a subset of digits in the hand. Our objective was to examine how CTS patients coordinate anticipatory and feedback-driven control for multi-digit grip force adaptation. Methods: We asked CTS patients and healthy controls to grasp, lift, and hold an object with different textures. Results: CTS patients effectively adapted their digit forces to changes in object texture, but produced excessive grip forces. CTS patients also produced larger peak force rate profiles with fewer modulations of normal force prior to lift onset than did controls and continued to increase grip force throughout the lift whereas forces were set at lift onset for the controls. Conclusions: These findings suggest that CTS patients use less online sensory feedback for fine-tuning their grip forces, relying more on anticipatory control than do healthy controls. Significance: These characteristics in force adaptation in CTS patients indicate impaired sensorimotor control which leads to excessive grip forces with the potential to further exacerbate their median nerve compression.

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