Torque steadiness and muscle activation are bilaterally impaired during shoulder abduction and flexion in chronic post-stroke subjects

Author(s)

Santos, Gabriela Lopes ; Fernanda Garcia-Salazar, Luisa ; Souza, Matheus Braganca ; Oliveira, Ana Beatriz ; Camargo, Paula Rezende ; Russo, Thiago Luiz

• Document type: Journal article
• Source: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY; v. 30, p. 151-160, OCT 2016.
• Web of Science Citations: 3

Abstract

Objective: To characterize sensorimotor control and muscle activation in the shoulder of chronic hemiparetic during abduction and flexion in maximal and submaximal isometric contractions. Furthermore, to correlate submaximal sensorimotor control with motor impairment and degree of shoulder subluxation. Methods: Thirteen chronic hemiparetic post-stroke age-gender matched with healthy were included. Isometric torques were assessed using a dynamometer. Electromyographic activity of the anterior and middle deltoid, upper trapezius, pectoralis major and serratus anterior muscles were collected. Variables were calculated for torque: peak, time to target, standard deviation (SD), coefficient of variation (CV), and standard error (RMSE); for muscle activity: maximum and minimum values, range and coefficient of activation. Motor impairment was determined by Fugl-Meyer and shoulder subluxation was measured with a caliper. Results: Paretic and non-paretic limbs reduced peak and muscle activation during maximal isometric contraction. Paretic limb generated lower force when compared with non-paretic and control. Paretic and non-paretic presented higher values of SD, CV, RMSE, and CV for prime mover muscles and minimum values for all muscles during steadiness. No correlation was found between sensorimotor control, motor impairment and shoulder subluxation. Conclusion: Chronic hemiparetic presented bilateral deficits in sensorimotor and muscle control during maximal and submaximal shoulder abduction and flexion. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 14/25845-6 - Effects of elastic tape on shoulder proprioception and sensory-motor performance during reaching in chronic hemiparetic subjects
• Grantee: Gabriela Lopes dos Santos
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/21621-3 - Effect of task specific training on muscle adaptation in gerbils post-ischemic stroke
• Grantee: Thiago Luiz de Russo
• Support Opportunities: Regular Research Grants