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Vol. 54. Issue 203.
Pages 85-90 (July - September 2019)
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Vol. 54. Issue 203.
Pages 85-90 (July - September 2019)
Original Article
Relationship between strength and flexibility levels in young soccer players
Relación entre los niveles de fuerza y flexibilidad en jóvenes jugadores de fútbol
Sarah Ramosa,b,
Corresponding author

Corresponding author.
, Roberto Simãob, Carlos Herdyb, Pablo Costac, Ingrid Diasb
a Club de Regatas Vasco da Gama, Rio de Janeiro, Brazil
b Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
c California State University, Fullerton, USA
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Tables (6)
Table 1. Anthropometric characteristics of the sample group (mean±SD; n=30).
Table 2. Flexibility in the dominant leg (DL) and non-dominant leg (NDL) in degrees (°).
Table 3. Quantity in percentage (%) of the athletes who were not within the normative standard in goniometry.
Table 4. Absolute peak torque of the quadriceps and hamstrings of the dominant leg (DL) and non-dominant leg (NDL) at speeds of 60°s and 180°s.
Table 5. Conventional and functional ratio of dominant leg (DL) and non-dominant leg (NDL) at speeds of 60°s and 180°s.
Table 6. Quantity in percentage (%) of the athletes that were not within the normative standard in the isokinetic test.
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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.


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.


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.

Muscle strength dynamometer
Range of motion articular

El equilibrio de la fuerza y de la flexibilidad entre las piernas dominantes (PD) y no dominantes (PND) en jóvenes jugadores de fútbol es imprescindible, pues puede minimizar los posibles mecanismos desencadenantes de lesiones y su influencia negativa en el desempeño. El objetivo de este estudio fue evaluar y comparar la fuerza y la flexibilidad uni y bilateral entre las PD y PND en jóvenes jugadores de fútbol.

Material y métodos

La muestra fue compuesta por 30 individuos (con edad entre 15,97±0,67 años). Se evaluó la fuerza isocinética a las velocidades de 60°/s y 180°/s en la acción concéntrica del cuádriceps e isquiotibiales y excéntrica de los isquiotibiales, y en las razones convencional y funcional, además de la goniometría para la flexión de cadera.


Los resultados demostraron que los atletas poseían una acción excéntrica de los isquiotibiales en 60°/s en las PD significativamente (p<0,05) más fuerte que en las PND, además de las PD tener una relación I/Q significativamente (p<0,05) más equilibrada que las PND.


Los atletas jóvenes de fútbol pueden presentar resultados isocinéticos no estandarizados. Estos resultados se observan debido a la diferencia en la fuerza muscular del muslo posterior con relación a las PD y PND y la relación de equilibrio entre el cuádriceps y los isquiotibiales, generando una asimetría de fuerza entre los miembros y en el mismo miembro. Es necesario monitorear y elaborar estrategias de entrenamiento para evitar estos desequilibrios, a fin de evitar lesiones.

Palabras clave:
Dinamómetro de fuerza muscular
Rango del movimiento articular


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