Purpose] The purpose of this study was to investigate the changes of muscle activity during squat motion after stretching the tensor fasciae latae muscle. [Participants and Methods] The participants comprised 19 healthy males. The test muscles were the vastus medialis obliquus and vastus lateralis. The participants performed the squat motion before and after stretching the tensor fasciae latae. We measured the muscle activities and the onset timing of the vastus medialis obliquus relative to that of the vastus lateralis during squat motions. [Results] The onset timing of the vastus medialis obliquus relative to that of the vastus lateralis was decreased, and the vastus medialis obliquus activity and vastus medialis obliquus/vastus lateralis activity ratio were increased after stretching the tensor fasciae latae. [Conclusion] This study revealed that stretching of the tensor fasciae latae increases the relative vastus medialis obliquus muscle activity.
To clarify the characteristics of scapular muscles when sitting up from a side-lying position with the shoulder flexed at different angles. [Participants and Methods] Thirteen healthy adult males initially lay on the right side with the shoulder flexed at an angle of 0° (Condition 1) or 60° (2), and then moved to an on-elbow position (propping the upper body with one elbow to raise it). During this movement, muscle activity was measured with surface electromyography electrodes attached to 4 muscles: the posterior fibers of the deltoid, middle and inferior fibers of the trapezius, and external abdominal oblique. Comparing measurement values between the 2 conditions, the activity levels of the target muscles before/after peak contraction and after the end of the movement were calculated.[Results] The activity levels of the inferior fibers of the trapezius before/after peak contraction and those of all muscles after the end of the movement were higher under Condition 1 compared with 2. [Conclusion] The pattern of scapular muscle activity during a side-lying-to-sitting movement may vary according to the shoulder flexion angle in the initial position.
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