Document Type : Research Paper I Open Access I Released under CC BY-NC 4.0 license


1 PhD student of exercise physiology, University of Tehran, Kish international campus, Kish, Iran

2 Associate professor of exercise physiology, University of Tehran , Tehran, Iran

3 Associate professor of exercise physiology, Tarbiat Modarres University, Tehran, Iran

4 Assistant professor of exercise physiology, University of Tehran, Kish international campus, Kish, Iran


The aim of this study was to examine the effect of two resistance-plyometric and small sided game methods on serum levels Myostatin, Growth and differentiation factor-associated serum protein-1and insulin like growth factor-I in youth soccer players.30 soccer players Gitipasand club who were constantly involved in training and had no history of any serious illness or severe injury, were chosen for available sampling.Thus, they were divided randomly in three groups, SSG (n=8), resistance-plyometric (n=11) and control (n=11). First, height, weight, BMI and VO2max of the subjects were measured. The next day, blood samples from the anterior brachial vein of subjects were taken. The experimental groups participated in their exercise program (8 week, 2 sessions per week plus three current sessions). All variables were measured again after 8 weeks. In order to compare data within groups' Dependent t-test was used and for comparison between groups One-way ANOVA was used by SPSS (v.22). The findings showed that after 8 weeks of SSG training plasma level of IGF-ɪ and GASP-1 increased significantly and in resistance-plyometric group, Myostatin decreased significantly (p<0/005). Reduction of myostatin and increase of other growth factors suggest that the traditional training methods can be replaced by these methods in the pre-season and during the season or maintenance phase. Therefore, in order to clear the effect of these two methods of trainings on growth mediators, more researches are needed.


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