Artículo
Age related changes in the Q angle of non-professional football players
Autor/es | Escamilla Martínez, Elena
Sánchez Martín, Fátima Ramos Ortega, Javier González García, Paula Cortés Vega, María Dolores Fernández Seguín, Lourdes María |
Director | |
Departamento | Universidad de Sevilla. Departamento de Fisioterapia Universidad de Sevilla. Departamento de Podología |
Fecha de publicación | 2023-06 |
Fecha de depósito | 2024-01-12 |
Publicado en |
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Resumen | Background
Football practice involves a great muscular demand, leading to the development of the lower limbs that, on occasions, can cause deviations from the normal anthropometric values. The quadriceps angle (Q angle) ... Background Football practice involves a great muscular demand, leading to the development of the lower limbs that, on occasions, can cause deviations from the normal anthropometric values. The quadriceps angle (Q angle) is a value often taken as a reference for the alignment of the lower limbs. Objective To observe the changes of the Q angle in young football players, because of muscular effort, analyzing the differences between four groups of different ages and to determine whether the playing position might influence these variations. Methods A cross sectional study was carried out with 104 male subjects divided into four groups according to age: under 8 years-old, 8-17 years-old, 17-21 years-old and over 21 years-old. A photograph was taken in standing position and the Q angle was plotted with KINOVEA® software. As for the reliability of the measurements, intraclass intra and interobserver coefficient were 0.958 and 0.860 respectively. The study was conducted in mid-season. Results Q angle value is greater in those under 8 years of age and decreases gradually and significantly (p < 0.005) until 17–21 years of age, where it stabilizes at values of 5.73° ± 2.78 for right Q angle and 5.88° ± 2.55 for left Q angle. Two way ANOVA demonstrated a significant group*position interaction for goalkeepers with a medium effect size in both angles (p < 0.001) with a medium effect (η2 Right Q angle = 0.31; η2 Left Q angle = 0.37). The values remain unchanged in subjects over 21 years of age (p > 0.005), except for goalkeepers, who suffered a difference in the evolution of the angle within their age category (p < 0.005) and with a high effect size with the other positions (value > 0.8) except forward (value < 0.5). Conclusion This study determines that the Q angle in football players decreases with growth, reaching values below 15° at the end of development. Playing positions only influence players over the age of 21, and the Q-angle of goalkeepers is greater than that of other players. |
Cita | Escamilla Martínez, E., Sánchez Martín, F., Ramos Ortega, J., González García, P., Cortés Vega, M.D. y Fernández Seguín L.M. (2023). Age related changes in the Q angle of non-professional football players. HELIYON, 9 (6), e16781. https://doi.org/10.1016/j.heliyon.2023.e16781. |
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