Co-ativação muscular e posição do punho durante a preensão sustentada em indivíduos saudáveis

Resumo (EN)

Objective – To evaluate surface electromyography activity (SEMG) of extensor carpi radialis (ECR) in relation to flexor digitorum superficialis muscles (FDS) during power sustained gripo task and to correlate this activity with wrist range of motion (ROM). Methods – Healthy female university students, right-handed students (N=34), mean age 23 years. The task was three grips with maximal isometric force using JamarTM dynamometer. Results – Main outcome measures, we used surface electromyograpy and considered 100% maximum voluntary contractrion to represent the amplitude of electromyographic activity. ROM was measured with electrogoniometer MiotecTM. Mean percentages of FDS and ECR activity were 92.41 (±4.84%) and 82 (±14.79%), respectively. Rate between FDS and ECR activation was 1:0.89. Mean ROM wrist extension during task was 13.92±9.18°. There was no significant correlation between ROM and SEMG activity for forearm muscles. Conclusion – The high EMG activity of extensor muscles found in this study reinforces its important synergistic role during a power sustained hand grip. The normality parameters can be considered in preventive and rehabilitation programs. The findings also suggest that there are different strategies of wrist extension ROM during grip.