The Influence of the Dominant Leg on Angle Trunk Rotation and Postural Symmetries in Adolescent Male Soccer Players: A Comparative Study

Background: The current study examined whether there is an association between the dominant leg (DL) and the side of angle trunk rotation (ATR) and evaluated postural asymmetries and anthropometric characteristics between adolescent male soccer players and non-athletes across different age groups (11–14 years). Methods: This study included 502 male participants: 291 soccer players (age: 13 ± 2 years; height: 158 ± 17 cm; weight: 50.6 ± 12 kg) and 211 non-athletes (age: 13 ± 2 years; height: 158.3 ± 11 cm; weight: 50.5 ± 21 kg). The participants were categorized into four age groups: 11, 12, 13, and 14 years. Using a scoliometer, the primary (A) and secondary (B) ATR measurements were recorded and categorized into subgroups of 0–2, 3–5, and ≥6 degrees. A Chi-square test and a Mann–Whitney U-test were employed to analyze the raw data. Results: In soccer players, a significant association was found between the DL and primary ATR (p < 0.001). Conversely, non-athletes exhibited a significant association between the DL and secondary ATR only (p < 0.05). No significant differences were observed in the anthropometric characteristics and ATR for the 11-year-old boys (p > 0.05). For the 12-year-old boys, there was a significant difference in the ATR-A region (p < 0.01). For the 13-year-olds, significant differences were found in height, ATR-A region, ATR-B side, ATR-B region, and ATR-B degrees (p < 0.05). The 14-year-old soccer players demonstrated significant differences in ATR metrics compared with non-athletes in the same age group (p < 0.01). Conclusions: The results indicate that older adolescent soccer players exhibited a higher ATR tendency compared to non-athletes. This suggests that daily soccer training and DL usage contribute to increase postural asymmetries and physical development variations in adolescence. These findings underscore the necessity for monitoring body posture health in athletes during the early period of adolescence in an attempt to mitigate the potential negative long-term impacts on their life.