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Ziab H, Deeb H, Deeb H, Mazbouh R. Effects of a 6-week High-intensity Resistance and Stretching Program on Football Performance in Novice Players: A Randomized Controlled Trial. PTJ 2025; 15 (4) :353-374
URL: http://ptj.uswr.ac.ir/article-1-750-fa.html

Purpose: This study aimed to assess the effects of a 6-week training program that combined stretching and strength exercises on the performance of novice football players aged 15 to 18 years. 
Methods: A double-blind randomized controlled trial (RCT) was conducted with 46 participants divided into four groups: A) dynamic high-intensity resistance training (DHIRT) (n=12), B) static stretching (n=13), AB) Combined DHIRT+stretching (n=11), and C) control (n=10). Performance outcomes included vertical and horizontal jump (VJ and HJ) distances, running speed (RS), acceleration (ACC), endurance (VO₂ max), shooting speed (SS), and heart rate (HR). Repeated-measures analysis of variance (ANOVA) and post-hoc analyses were used to assess group differences and time effects.
Results: A repeated-measures ANOVA showed a significant effect of time (η²=0.827) and a significant time-by-group interaction (η²=0.418), indicating substantial intervention effects. Pairwise comparisons revealed that the combined training group (AB) demonstrated statistically significant improvements over the control group (C) in HJ (P=0.003), RS (P=0.003), VO₂ max (P=0.000), endurance (P=0.000), SS (P=0.018), and ACC (P=0.000). Vertical jump (VJ) improved by 2.97%, HJ by 6.85%, and VO₂ max by 5.83% in the combined Group. No significant intergroup differences were observed in HR (P>0.05).
Conclusion: Combining DHIRT and static stretching is more effective than either intervention alone for improving football-related physical attributes in novice players.