Procedures
ANTERIOR
The study examined the impact of a 4-week PT program (two sessions per week, with a 48-h rest interval) on muscle activity patterns (Rectus Femoris, Biceps Femoris, Tibialis Anterior, Medial Gastrocnemius) in different phases (preparatory, contact, jump) during a one-leg drop jump. All protocols were approved by the Tarbiat Modares University Research Committee and Review Board in Physical Education Department. This study was conducted according to the ethical principles of the Declaration of Helsinki and approved by the Institutional Review Board of Tarbiat Modares University (#TMU/D/10901181390). Written informed consent forms were signed by all participants.The subjects of the experimental group performed the plyometric training for 4 weeks, 2 sessions each week, a total of 8 sessions (Table 4-week plyometric training program.