Relationship between strength and flexibility levels in young soccer players

Introduction

Balance of strength and flexibility between the dominant (DL) and non-dominant limbs (NDL) in young soccer players is essential, since it can minimize the possible injury-triggering mechanisms and their negative influence on performance. The aim of this study was to evaluate and compare the unilateral and bilateral strength and flexibility between the DL and NDL in young soccer players.

Material and methods

The sample consisted of 30 individuals (aged 15.97 ± 0.67 years). The isokinetic strength was measured at the velocities of 60° s and 180° s in the concentric action of the quadriceps and hamstrings as well as eccentric of the hamstrings, and in the conventional and functional ratios, along with hip flexion range of motion.

Results

The results showed the athletes had an eccentric strength of the hamstrings at 60° s in the DL significantly (p < 0.05) stronger than in the NDL, and the DL had a significant H/Q ratio (p < 0.05) more balanced than the NDL.

Conclusions

Young soccer athletes may present a non-standard isokinetic results. These results are observed because of the difference in muscle strength of the posterior thigh compared to DL and NDL and the balance relation between the quadriceps and the hamstrings, generating an asymmetry of strength between the limbs and on the same member. It is necessary to monitor and devise training strategies to avoid these imbalances in order to prevent injuries.