Feedforward coactivation of trunk muscles during rapid shoulder movements

• DOI: 10.1016/j.jseint.2022.04.003
• Publication Date: 2022-05-05T17:56:20Z
• Authors: Masahiro Yamane; Mitsuhiro Aoki; Yuji Sasaki; Tomoya Hayashi
• Keywords: Coactivation; Deltoid curve

Shoulder movements that involve unilateral and bilateral flexion, extension, abduction, asymmetrical flexion-extension cause the activity of trunk muscles. There has not been a fixed consensus on onset deep muscle activities including psoas major (PM), quadratus lumborum (QL), transversus abdominis (TrA), lumbar multifidus (MF) during shoulder movements. The purpose this study was to measure electromyographic muscles rapid clarify coordinated pattern 11 movements.Thirteen men participated in study. right (PM, QL, TrA, MF) were measured using fine-wire electrodes, those left deltoid (anterior, middle, posterior) superficial (rectus abdominis, external oblique [EO], internal [IO]) surface electrodes as participants performed 6 types unilateral, 3 bilateral, 2 We defined feedforward activation before or within +50 ms feedback after ms. A 1-way analysis variance compare each movement.The mean PM (26.0 ms), QL (13.1 TrA (-19.7 MF (20.4 ms) demonstrated flexion. (1.6-48.7 rectus (-1.7 17.3 EO (5.6-40.8 left, right, extension. (22.9 (23.0 (18.9 (15.4 while IO (4.4-10.9 only abduction. (-27.6 (-23.9 flexion-right (33.4 (-17.2 extension-right flexion.Rapid occur with depending direction Feedforward single combined may facilitate