![]() Once proofs had been performed and MIVC values were taken, electrodes were placed to record the activity of the five muscles, as well as the electric goniometer to record movement. Age differences in muscle recruitment patterns were found, which underscores the importance of developing musculoskeletal data to prevent and guide geriatric shoulder pathologies. The recruitment order varied between age groups, showing a general tendency towards delayed onset times in older adults, except for the upper trapezius muscle. ![]() No significant differences in RMS values of dynamic contractions were detected, except for the serratus anterior, but there were for isometric contractions of all muscles analyzed (Adults > Older adults 0.05). Statistical differences in strength (Adults > Older adults 0.05) existed between groups. ![]() Differences in sEMG amplitudes (root mean square, RMS) of all contractions, but also onset latencies during concentric contraction of each muscle between age groups, were analyzed. Participants abducted the arm from 0° up to an abduction angle of 135° for concentric and eccentric contraction, and from 0° to 45°, and remained there at 80% of the MIVC level while isometrically pushing against a handheld dynamometer. For the sEMG signal registration, concentric and eccentric contraction with and without 1 kg and isometric contraction were requested. Maximum isometric voluntary contraction (MIVC) was determined at 45° glenohumeral abduction. Surface electromyography (sEMG) of the middle deltoid, upper and lower trapezius, infraspinatus, and serratus anterior muscles was recorded. ![]() A cross-sectional study comparing 30 adults (20–64) and 30 older adults (>65). Purpose: To assess differences in the force and motor recruitment patterns of shoulder muscles between age groups to understand functional disorders. Aging processes in the musculoskeletal system lead to functional impairments that restrict participation. ![]()
0 Comments
Leave a Reply. |