ISSN: 1899-1955
Human Movement
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3/2020
vol. 21
 
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abstract:
Original paper

Augmented muscle activation in reaching movements after stroke

Paula Cintia Dos Santos Vieira
1
,
Rafael Almeida Oliveira
1
,
Luciane Martinho Fernandes
1
,
Karina Pereira
1
,
Luciane Aparecida Pascucci Sande de Souza
1

1.
Federal University of Triangulo Mineiro, Uberaba, Brazil
Human Movement 2020 vol. 21 (3), 39-46
Online publish date: 2020/01/28
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Purpose
Post-stroke hemiparesis can cause motor deficits that affect the completion of functional activities, such as reaching. The study aim was to quantitatively compare the changes in muscle activation between hemiparetic individuals during the subacute and chronic phases of recovery and healthy individuals in a reaching task.

Methods
The electromyographic activity was recorded of the upper trapezius (UT), biceps brachii (BB), triceps brachii (TB), flexor carpi ulnaris (FCU), and extensor carpi radialis (ECR ) muscles in 10 subacute individuals (group 1), 10 chronic individuals (group 2), and 10 healthy individuals (group 3). The normalized root mean square (nRMS) was calculated, followed by a qualitative index based on maximum activation, and the occurrence of co-contraction was analysed.

Results
In the nRMS analysis, group 1 presented significantly higher activation than group 3 for BB, TB, and ECR; group 2 showed significantly higher activation than group 3 for BB and FCU. In the qualitative analysis, group 1 exhibited greater activity for UT, group 2 for ECR, and group 3 for UT. There was no statistically significant difference in the co-contraction analysis between the antagonist muscle pairs of BB/TB and FCU/ECR.

Conclusions
Muscle activation was greater in the post-stroke groups in comparison with healthy individuals.

keywords:

stroke, hemiparesis, electromyography

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