The Effect of Six Weeks Plyometric Training with Nonlinear Periodization on Hormonal Changes, Muscle Hypertrophy and Leg Muscles Elastic Property in Male Athletes (Nonlinear Periodization of Plyometric Training and Hormonal Changes)

Hormonal response to training is dependent on various factors. However, A few studies have examined the effects of plyometric training on hormonal changes. The purpose of present study was to investigate the effect of different periodization of plyometric training on hormonal changes, muscle hypertrophy and leg muscles elastic property. For this, thirty six male athletes (age 21.58±2.64, height 174.42± 6.01, weight 69.05±9.68) volunteered to participate in this study. Pretest was including measurements of anthropometric variables, thigh muscles CSA, leg muscles elastic index and fasting blood sampling. Then, the participants divided into three training groups include traditional, Daily undulating and weekly undulating groups and one control group. The Training program performed in 6 weeks with 3 sessions per week. 48 hours after the last training session posttest was performed. Intragroup changes analyzed by ANCOVA statistical method and LSD post hoc test. As well as, intergroup changes analyzed by paired t-test. The significant level set P˂0.05. The findings showed that daily undulating and weekly undulating periodization of plyometric training significantly improved resting concentration of testosterone, testosterone to cortisol ratio, and thigh muscles CSA than the pretest and control group. But traditional periodization of plyometric training only improved than the pretest. All three periodization models of plyometric training weren’t significant effect on leg muscles elastic index. According to the results and Percent change it seems that non-linear periodization of plyometric training has to more efficient than the traditional periodization in improvement of hormonal changes, anabolism status, muscle hypertrophy, and leg elastic muscles property.