Challenging standing balance reduces the asymmetry of motor control of postural sway poststroke

Courtney Pollock; Michael Hunt; Taian Martins Vieira; Alessio Gallina; Tanya D Ivanova; Jayne Garland

doi:10.1123/mc.2017-0098

Challenging standing balance reduces the asymmetry of motor control of postural sway poststroke

Courtney Pollock, Michael Hunt, Taian Martins Vieira, Alessio Gallina, Tanya D Ivanova, Jayne Garland

Sport, Exercise and Rehabilitation Sciences

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

316 Downloads (Pure)

Abstract

Background: Ankle plantarflexor muscle impairment contributes to asymmetrical postural control poststroke.

Objective: This study examines the relationship of plantarflexor electromyography (EMG) with anterior-posterior center of pressure (APCOP) in people poststroke during progressive challenges to standing balance.

Methods: Ten people poststroke and 10 controls participated in this study. Anteriorly directed loads of 1% body mass (BM) were applied to the pelvis every 25-40 s until 5%BM was reached. Cross-correlation values between plantarflexor EMG and APCOP (EMG:APCOP) position and velocity were compared.

Results: EMG:APCOP velocity correlations were stronger than EMG:APCOP position across all muscles ( p < .01), and correlations were predominately stronger in the nonparetic compared with the paretic leg ( p < .05). Increasing challenge to standing balance reduced asymmetry of EMG:APCOP relationships.

Conclusions: These data suggest that sensory information reflected in APCOP velocity interacts more strongly with plantarflexor activity in people poststroke and controls than APCOP position. Furthermore, increasing challenge to standing balance reduces postural control asymmetry between legs poststroke.

Original language	English
Pages (from-to)	327-343
Number of pages	17
Journal	Motor Control
Volume	23
Issue number	3
DOIs	https://doi.org/10.1123/mc.2017-0098
Publication status	Published - 1 Jan 2019

Keywords

Paresis
Plantarflexors
Postural control
Stroke

ASJC Scopus subject areas

Physical Therapy, Sports Therapy and Rehabilitation
Clinical Neurology
Physiology (medical)

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Pollock_et_al_Challenging_standing_balance_reduces_the_asymmetry_of_motor_control_of_postural_sway_poststroke_Motor_Control_2019
Checked for eligibility: 20/09/2019 Accepted author manuscript version reprinted, by permission, fromMotor Control, 2019, 23 (3): 327–343, https://doi.org/10.1123/mc.2017-0098. © Human Kinetics, Inc.
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Cite this

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title = "Challenging standing balance reduces the asymmetry of motor control of postural sway poststroke",

abstract = " Background: Ankle plantarflexor muscle impairment contributes to asymmetrical postural control poststroke.Objective: This study examines the relationship of plantarflexor electromyography (EMG) with anterior-posterior center of pressure (APCOP) in people poststroke during progressive challenges to standing balance. Methods: Ten people poststroke and 10 controls participated in this study. Anteriorly directed loads of 1% body mass (BM) were applied to the pelvis every 25-40 s until 5%BM was reached. Cross-correlation values between plantarflexor EMG and APCOP (EMG:APCOP) position and velocity were compared. Results: EMG:APCOP velocity correlations were stronger than EMG:APCOP position across all muscles ( p < .01), and correlations were predominately stronger in the nonparetic compared with the paretic leg ( p < .05). Increasing challenge to standing balance reduced asymmetry of EMG:APCOP relationships. Conclusions: These data suggest that sensory information reflected in APCOP velocity interacts more strongly with plantarflexor activity in people poststroke and controls than APCOP position. Furthermore, increasing challenge to standing balance reduces postural control asymmetry between legs poststroke. ",

keywords = "Paresis, Plantarflexors, Postural control, Stroke",

author = "Courtney Pollock and Michael Hunt and Vieira, {Taian Martins} and Alessio Gallina and Ivanova, {Tanya D} and Jayne Garland",

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AU - Hunt, Michael

AU - Vieira, Taian Martins

AU - Gallina, Alessio

AU - Ivanova, Tanya D

AU - Garland, Jayne

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N2 - Background: Ankle plantarflexor muscle impairment contributes to asymmetrical postural control poststroke.Objective: This study examines the relationship of plantarflexor electromyography (EMG) with anterior-posterior center of pressure (APCOP) in people poststroke during progressive challenges to standing balance. Methods: Ten people poststroke and 10 controls participated in this study. Anteriorly directed loads of 1% body mass (BM) were applied to the pelvis every 25-40 s until 5%BM was reached. Cross-correlation values between plantarflexor EMG and APCOP (EMG:APCOP) position and velocity were compared. Results: EMG:APCOP velocity correlations were stronger than EMG:APCOP position across all muscles ( p < .01), and correlations were predominately stronger in the nonparetic compared with the paretic leg ( p < .05). Increasing challenge to standing balance reduced asymmetry of EMG:APCOP relationships. Conclusions: These data suggest that sensory information reflected in APCOP velocity interacts more strongly with plantarflexor activity in people poststroke and controls than APCOP position. Furthermore, increasing challenge to standing balance reduces postural control asymmetry between legs poststroke.

AB - Background: Ankle plantarflexor muscle impairment contributes to asymmetrical postural control poststroke.Objective: This study examines the relationship of plantarflexor electromyography (EMG) with anterior-posterior center of pressure (APCOP) in people poststroke during progressive challenges to standing balance. Methods: Ten people poststroke and 10 controls participated in this study. Anteriorly directed loads of 1% body mass (BM) were applied to the pelvis every 25-40 s until 5%BM was reached. Cross-correlation values between plantarflexor EMG and APCOP (EMG:APCOP) position and velocity were compared. Results: EMG:APCOP velocity correlations were stronger than EMG:APCOP position across all muscles ( p < .01), and correlations were predominately stronger in the nonparetic compared with the paretic leg ( p < .05). Increasing challenge to standing balance reduced asymmetry of EMG:APCOP relationships. Conclusions: These data suggest that sensory information reflected in APCOP velocity interacts more strongly with plantarflexor activity in people poststroke and controls than APCOP position. Furthermore, increasing challenge to standing balance reduces postural control asymmetry between legs poststroke.

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Challenging standing balance reduces the asymmetry of motor control of postural sway poststroke

Abstract

Keywords

ASJC Scopus subject areas

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