Bimanual force control strategies in chronic stroke: Finger extension versus power grip

Neha Lodha, Carolynn Patten, Stephen A. Coombes, James H. Cauraugh

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Stroke leads to motor asymmetries in the flexor and extensor muscles of the hand. Typically, the strength deficits in the extensors are greater than the flexors. The impact of differential motor abilities of these muscle groups on the execution of bimanual force control tasks in individuals with stroke is unknown. The primary purpose of this study was to determine the influence of task constraints on visually guided bimanual force control in chronic stroke. Stroke survivors and age-matched individuals performed bimanual isometric contractions for 20. s to match target submaximal force levels. Online visual feedback of the total force (sum of the forces produced by both hands) was provided. The task constraints were manipulated by (a) finger extension, and (b) finger flexion (power grip). Force asymmetry was indexed by the proportion of force contributed by the paretic hand to the total force. The stroke group demonstrated task-specific asymmetry in bimanual force control. Specifically, the paretic hand contributed less force than the non-paretic hand in finger extension whereas this relationship was reversed in power grip. Importantly, regardless of the nature of the task, reduction in motor impairments was associated with increased symmetry and coordination in bimanual tasks. Further, bimanual submaximal grip force control revealed asymmetry and coordination deficits that are not identified by investigating bimanual maximal force production alone. The motor control strategy adopted to optimize performance on bimanual tasks revealed the altered force production of the paretic hand due to the combined effect of extensor weakness and enhanced flexor bias following stroke. Bimanual asymmetries in stroke survivors highlight the need for identifying and treating the task-specific impairments for maximizing motor recovery post stroke.

Original languageEnglish (US)
Pages (from-to)2536-2545
Number of pages10
JournalNeuropsychologia
Volume50
Issue number11
DOIs
StatePublished - Sep 1 2012
Externally publishedYes

Fingerprint

Hand Strength
Fingers
Stroke
Hand
Survivors
Muscles
Sensory Feedback
Isometric Contraction
Aptitude
Power (Psychology)
Advisory Committees

Keywords

  • Asymmetry
  • Bimanual
  • Coordination
  • Extension
  • Finger
  • Flexion
  • Force control
  • Motor control
  • Power grip
  • Stroke
  • Upper extremity

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience
  • Behavioral Neuroscience

Cite this

Bimanual force control strategies in chronic stroke : Finger extension versus power grip. / Lodha, Neha; Patten, Carolynn; Coombes, Stephen A.; Cauraugh, James H.

In: Neuropsychologia, Vol. 50, No. 11, 01.09.2012, p. 2536-2545.

Research output: Contribution to journalArticle

Lodha, Neha ; Patten, Carolynn ; Coombes, Stephen A. ; Cauraugh, James H. / Bimanual force control strategies in chronic stroke : Finger extension versus power grip. In: Neuropsychologia. 2012 ; Vol. 50, No. 11. pp. 2536-2545.
@article{35d2e36eb175453d8cb0b0d009d6680e,
title = "Bimanual force control strategies in chronic stroke: Finger extension versus power grip",
abstract = "Stroke leads to motor asymmetries in the flexor and extensor muscles of the hand. Typically, the strength deficits in the extensors are greater than the flexors. The impact of differential motor abilities of these muscle groups on the execution of bimanual force control tasks in individuals with stroke is unknown. The primary purpose of this study was to determine the influence of task constraints on visually guided bimanual force control in chronic stroke. Stroke survivors and age-matched individuals performed bimanual isometric contractions for 20. s to match target submaximal force levels. Online visual feedback of the total force (sum of the forces produced by both hands) was provided. The task constraints were manipulated by (a) finger extension, and (b) finger flexion (power grip). Force asymmetry was indexed by the proportion of force contributed by the paretic hand to the total force. The stroke group demonstrated task-specific asymmetry in bimanual force control. Specifically, the paretic hand contributed less force than the non-paretic hand in finger extension whereas this relationship was reversed in power grip. Importantly, regardless of the nature of the task, reduction in motor impairments was associated with increased symmetry and coordination in bimanual tasks. Further, bimanual submaximal grip force control revealed asymmetry and coordination deficits that are not identified by investigating bimanual maximal force production alone. The motor control strategy adopted to optimize performance on bimanual tasks revealed the altered force production of the paretic hand due to the combined effect of extensor weakness and enhanced flexor bias following stroke. Bimanual asymmetries in stroke survivors highlight the need for identifying and treating the task-specific impairments for maximizing motor recovery post stroke.",
keywords = "Asymmetry, Bimanual, Coordination, Extension, Finger, Flexion, Force control, Motor control, Power grip, Stroke, Upper extremity",
author = "Neha Lodha and Carolynn Patten and Coombes, {Stephen A.} and Cauraugh, {James H.}",
year = "2012",
month = "9",
day = "1",
doi = "10.1016/j.neuropsychologia.2012.06.025",
language = "English (US)",
volume = "50",
pages = "2536--2545",
journal = "Neuropsychologia",
issn = "0028-3932",
publisher = "Elsevier Limited",
number = "11",

}

TY - JOUR

T1 - Bimanual force control strategies in chronic stroke

T2 - Finger extension versus power grip

AU - Lodha, Neha

AU - Patten, Carolynn

AU - Coombes, Stephen A.

AU - Cauraugh, James H.

PY - 2012/9/1

Y1 - 2012/9/1

N2 - Stroke leads to motor asymmetries in the flexor and extensor muscles of the hand. Typically, the strength deficits in the extensors are greater than the flexors. The impact of differential motor abilities of these muscle groups on the execution of bimanual force control tasks in individuals with stroke is unknown. The primary purpose of this study was to determine the influence of task constraints on visually guided bimanual force control in chronic stroke. Stroke survivors and age-matched individuals performed bimanual isometric contractions for 20. s to match target submaximal force levels. Online visual feedback of the total force (sum of the forces produced by both hands) was provided. The task constraints were manipulated by (a) finger extension, and (b) finger flexion (power grip). Force asymmetry was indexed by the proportion of force contributed by the paretic hand to the total force. The stroke group demonstrated task-specific asymmetry in bimanual force control. Specifically, the paretic hand contributed less force than the non-paretic hand in finger extension whereas this relationship was reversed in power grip. Importantly, regardless of the nature of the task, reduction in motor impairments was associated with increased symmetry and coordination in bimanual tasks. Further, bimanual submaximal grip force control revealed asymmetry and coordination deficits that are not identified by investigating bimanual maximal force production alone. The motor control strategy adopted to optimize performance on bimanual tasks revealed the altered force production of the paretic hand due to the combined effect of extensor weakness and enhanced flexor bias following stroke. Bimanual asymmetries in stroke survivors highlight the need for identifying and treating the task-specific impairments for maximizing motor recovery post stroke.

AB - Stroke leads to motor asymmetries in the flexor and extensor muscles of the hand. Typically, the strength deficits in the extensors are greater than the flexors. The impact of differential motor abilities of these muscle groups on the execution of bimanual force control tasks in individuals with stroke is unknown. The primary purpose of this study was to determine the influence of task constraints on visually guided bimanual force control in chronic stroke. Stroke survivors and age-matched individuals performed bimanual isometric contractions for 20. s to match target submaximal force levels. Online visual feedback of the total force (sum of the forces produced by both hands) was provided. The task constraints were manipulated by (a) finger extension, and (b) finger flexion (power grip). Force asymmetry was indexed by the proportion of force contributed by the paretic hand to the total force. The stroke group demonstrated task-specific asymmetry in bimanual force control. Specifically, the paretic hand contributed less force than the non-paretic hand in finger extension whereas this relationship was reversed in power grip. Importantly, regardless of the nature of the task, reduction in motor impairments was associated with increased symmetry and coordination in bimanual tasks. Further, bimanual submaximal grip force control revealed asymmetry and coordination deficits that are not identified by investigating bimanual maximal force production alone. The motor control strategy adopted to optimize performance on bimanual tasks revealed the altered force production of the paretic hand due to the combined effect of extensor weakness and enhanced flexor bias following stroke. Bimanual asymmetries in stroke survivors highlight the need for identifying and treating the task-specific impairments for maximizing motor recovery post stroke.

KW - Asymmetry

KW - Bimanual

KW - Coordination

KW - Extension

KW - Finger

KW - Flexion

KW - Force control

KW - Motor control

KW - Power grip

KW - Stroke

KW - Upper extremity

UR - http://www.scopus.com/inward/record.url?scp=84865559791&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84865559791&partnerID=8YFLogxK

U2 - 10.1016/j.neuropsychologia.2012.06.025

DO - 10.1016/j.neuropsychologia.2012.06.025

M3 - Article

C2 - 22781814

AN - SCOPUS:84865559791

VL - 50

SP - 2536

EP - 2545

JO - Neuropsychologia

JF - Neuropsychologia

SN - 0028-3932

IS - 11

ER -