New Training Tasks for Stepwise Loading in Isometric Bodyweight Squat with Active Posture Control

Isometric bodyweight squats are fundamental exercises in athletic training and rehabilitation. Previously, we measured muscle activity a normal squat posture (NSP) with the center of foot pressure (COP) intentionally shifted forward as far possible (forward-shifted posture: FSP), patterns varied significantly according to COP location. This study focused on stepwise loading strategy. Ten healthy male participants performed isometric previous study, adopting NSP FSP, three knee flexion angles (30°, 60°, 90°). The activities vastus medialis (VM), semitendinosus, tibialis anterior (TA), gastrocnemius lateral head were using surface electromyogram. further explored relationship between shifting electromyogram changes three-dimensional diagrams. In one-way repeated measures analysis variance by ranks, affected VM TA FSP. Combining these findings, tasks created train individual target muscles. ten examined all tasks, feasibility was confirmed accordingly.