Coactivation between wrist extensors and flexors muscles during functional activities in subjects with hand osteoarthritis

• Grant number: 17/05381-3
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2017
• End date: July 31, 2018
• Field of knowledge: Health Sciences - Physiotherapy and Occupational Therapy
• Principal Investigator: Paula Regina Mendes da Silva Serrão
• Grantee: Gabriella Regina Correa e Silva
• Host Institution: Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

The functional position of the wrist complex optimizes the strength of the fingers so that the movement of closing the hand can be performed with the least possible effort. This is because one of the functions of the wrist extensor muscles is to stabilize this joint. If this does not occur, there may be a reduction in grip strength. Thus, the presence of hand osteoarthritis (HAO) could be related to impairment of normal function due to a change in the muscle activation pattern of agonists and antagonists. The objective of this study will be to compare the level of coactivation between the wrist extensor muscles and the wrist flexor muscles between subjects with OAM and healthy individuals, during the performance of two functional tasks and palmar grip strength. It could be hypothesized that coactivation between the flexors and the wrist extensors would increase in individuals with HOA. Subjects will be divided into 2 groups: HOAG (composed of subjects with HOA and CG (healthy individuals). An electromyographic evaluation will be performed during the task of writing and unscrewing a bottle cap, and during evaluation of palmar grip strength. The electrodes will be placed on the flexor carpi ulnaris muscle, the flexor digitorum superficialis muscles, and the extensor carpi radialis longus and brevis muscles. The rate of coactivation for each activity and during the palmar grip strength will be calculated, as well as the correlation between this index and the palmar grip strength. The groups will be compared using the Student's t-test for independent samples or the Mann Whitney test, and the relationships between the variables will be assessed by the Pearson or Spearman correlation, according to the normality of the data. For all analyzes, a significance level of 5% (± = 0.05) will be adopted. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

TOSSINI, NATALIA BARBOSA; LESSI, GIOVANNA CAMPARIS; ZACHARIAS, ANDRE LUIS SIMOES; SILVA, GABRIELLA REGINA CORREA E; ABRANTES, LUIZA SOUZA SERAPHIM; SERRAO, PAULA REGINA MENDES DA SILVA. Impairment of electrical activation of wrist flexor and extensor muscles during gripping and functional activities in the early stage of hand osteoarthritis: A cross-sectional study. JOURNAL OF HAND THERAPY, v. 34, n. 1, p. 109-115, JAN-MAR 2021. (17/05381-3, 16/24311-3)