Age-related changes in muscle strength and multi-channel surface electromyography during isometric and isokinetic knee extension in men and women

This research examined age-related changes in muscle strength and multi-channel surface electromyography (EMG) spatial parameters during isometric and isokinetic knee extensions. Peak torque, mean EMG amplitude, intensity, entropy and Coefficient of Variation (CV) were compared across age and sex. While significant differences were found in peak torque, mean RMS and intensity between age and sex, there were no significant differences in entropy or CV except within the younger female group who demonstrated decreased entropy with increasing isometric torque.