Unlocking fair play: battling age-related biases in identifying Chile's next athletic prodigies
DOI:
https://doi.org/10.47197/retos.v70.117190Keywords:
Biological maturation, physical education, relative age effect, talent identification, z strategyAbstract
Introduction: The relative age effect (RAE) refers to performance advantages for individuals born early in a selection period compared to later-born peers, potentially biasing early talent identification in youth sports. This study extends prior research on the Z Strategy for detecting sports talents in Chilean schoolchildren.
Objective: To analyze the relative age effect in detecting potential sports talents among Chilean 8th-grade students using the 2013 Physical Education SIMCE database and Z Strategy results. Methodology: A retrospective cross-sectional study was conducted with a representative sample of approximately 12,000 8th-grade students (ages 13-16, 50% female) assessed in 2013. Anthropometric and physical fitness data were collected via standardized tests. The Z Strategy identified talents as students with values ≥2 standard deviations above the mean in at least one variable, standardized by age and sex. Birthdates were categorized into quartiles (Q1-Q4), and distributions were compared using chi-square tests.
Results: 1,242 students (13%) were identified as potential talents. Males showed significant RAE with 36% born in Q1 versus 15% in Q4 (p<0.001), while females had uniform distribution (~25% per quartile). Overall, 61% of talents were born in the first half of the year compared to 38% in the second half.
Discussion: Findings align with international literature indicating widespread RAE in youth sports, particularly stronger in males due to maturation differences, as reported in studies on soccer and athletics. The absence in females matches reports of weaker RAE in female contexts. Conclusions: RAE significantly biases talent detection in Chilean male students, necessitating adjustments for equitable identification.
References
Agencia de Calidad de la Educación. (2013). Resultados Estudio Nacional de Educación Física 8° básico 2013. https://archivos.agenciaeducacion.cl/biblioteca_digital_historica/resultados/2013/result8b_edfisica_2013.pdf
Agricola, A., Polách, M., Válek, T., Nykodým, J. ., & Zháněl, J. (2024). El efecto de la edad relativa de los participantes en las finales mundiales de tenis júnior en 2012–2016 (The Relative Age Effect of Participants in the World Junior Tennis Finals in 2012–2016). Retos, 51, 955–961. https://doi.org/10.47197/retos.v51.99664
Almeida, C. H., & Volossovitch, A. (2022). Relative age effect among U14 football players in Portugal: do geographical location, team quality and playing position matter? Science and Medicine in Football, 6(3), 285–294. https://doi.org/10.1080/24733938.2021.1977840
Becerra Patiño, B. A., Varón Murcia, J. J., Cárdenas Contreras, S., Castro Malaver, M. A., & Ávi-la Martínez, J. D. (2024). Producción científica sobre el efecto de la edad relativa en el deporte: análisis bibliométrico de los últimos 9 años (2015 2023). Retos, 52, 623–638. https://doi.org/10.47197/retos.v52.101944
Cobley, S., Baker, J., Wattie, N., & McKenna, J. (2009). Annual age-grouping and athlete development: A meta-analytical review of relative age effects in sport. Sports Medicine, 39(3), 235-256. https://doi.org/10.2165/00007256-200939030-00005
Conde‑Ripoll, R., Martín‑Miguel, I., Muñoz, D., Ferrara, C., Sánchez‑Alcaraz, B. J., & Escudero‑Tena, A. (2025). Relative Age Effect in Junior Padel Players: Insights from National Team Selection at the 2024 Junior European Championships. Applied Sciences, 15(2), 600.https://doi.org/10.3390/app15020600
Delorme, N., Boiché, J., & Raspaud, M. (2010a). Relative age effect in elite sports: Methodological bias or real discrimination? European Journal of Sport Science, 10(2), 91-96. https://doi.org/10.1080/17461390903271584
Delorme, N., Boiché, J., & Raspaud, M. (2010b). Relative age effect in female sport: a diachronic exami-nation of soccer players. Scandinavian Journal of Medicine & Sciences in Sports, 20(3), 509-15. https://doi.org/10.1111/j.1600-0838.2009.00979.x.
Hernández-Mosqueira, C. M., Castillo Quezada, H. E., Peña-Troncoso, S., Fernandes da Silva, S., Cresp-Barría, M. A., Cárcamo-Oyarzun, J., Martínez-Salazar, C., Caniuqueo-Vargas, A., & Fernandes Filho, J. (2020). Valoración del estado nutricional y la condición física de estudiantes de educa-ción básica de Chile. Nutrición Hospitalaria, 37(6), 1166- 1172. https://doi.org/10.20960/nh.03092
Gutiérrez Díaz del Campo, D. (2013). Revisión y propuestas de intervención sobre el efecto de la edad relativa en los ámbitos educativo y deportivo. Retos, 23, 51-63. https://doi.org/10.47197/retos.v0i23.33423
Heilmann, F., Kuhlig, A., & Stoll, O. (2024). Relative age effects in German youth A and B men's soccer teams: Survival of the fittest? Frontiers in Sports and Active Living, 6, 1432605. https://doi.org/10.3389/fspor.2024.1432605
Helsen, W. F., Van Winckel, J., & Williams, A. M. (2005). The relative age effect in youth soccer across Europe. Journal of Sports Sciences, 23(6), 629-636. https://doi.org/10.1080/02640410400021310
Morganti, R., Rossi, C., Benedetti, F., & Trecroci, A. (2025). Relative age effects in European youth soc-cer: Prevalence at UEFA U17 and influence on senior-level representation. Frontiers in Sports and Active Living, 7, 1546978. https://doi.org/10.3389/fspor.2025.1546978
Musch, J., & Grondin, S. (2001). Unequal competition as an impediment to personal development: A review of the relative age effect in sport. Developmental Review, 21(2), 147-167. https://doi.org/10.1006/drev.2000.0516
Ramírez Lechuga, J., Gálvez González, J., Ferreras Mencía, S., Cardona Linares, A. J., & Cenizo Benju-mea, J. M. (2025). Efecto de la edad relativa en la coordinación motriz, agilidad y fuerza muscu-lar en escolares. Retos, 66, 704-713. https://doi.org/10.47197/retos.v0i66.12345
Riffo-Calisto, M., Verdugo-Miranda, F., Arenas-Sánchez, G., & Mahecha-Matsudo, S. (2020). Edad relati-va en deportistas de elite chilenos de acuerdo con disciplina deportiva, género y desempeño deportivo. Journal of Sport and Health Research, 12(3), 396-405. https://recyt.fecyt.es/index.php/JSHR/article/view/83855/61905
Redondo, J. C., Fernández-Martínez, E., & Izquierdo, J. M. (2019). Efecto de la edad relativa en las dis-ciplinas de lanzamientos de los participantes españoles en el plan nacional de tecnificación de atletismo. Cuadernos de Psicología del Deporte, 19(3), 156-167. https://www.redalyc.org/journal/2270/227065157015/html/
Prieto Ayuso, A., Pastor Vicedo, J. C., Serra Olivares, J., & González Víllora, S. (2015). El efecto de la edad relativa en el fútbol español: temporada 2013/14. Apunts Educación Física y Deportes, (121) ,36-43. [fecha de Consulta 11 de Agosto de 2025]. ISSN: 1577-4015. Recuperado de: https://www.redalyc.org/articulo.oa?id=551656900005
Souza-Lima, J., Leppe Zamora, J., Yáñez-Sepúlveda, R., Matsudo, V. K. R., & Mahecha Matsudo, S. (2020). Detección de talentos deportivos con la Estrategia Z – estudio transversal. Revista Bra-sileira de Medicina do Esporte, 26(2), 147-152. https://doi.org/10.1590/1517-869220202602195735
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Copyright (c) 2025 Josivaldo De Souza Lima, Rodrigo Yáñez-Sepúlveda, Catalina Muñoz-Strale, Javiera Alarcon-Aguilar, Maribel Parra-Saldias, Andrés Godoy-Cumillaf, Daniel Duclos-Bastias, Frano Giakoni-Ramírez
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