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Joel Barrera-Díaz is a University Lecturer, Researcher, and Specialist in Sports Training with a focus on high-performance football. Holding a PhD in Sports Sciences from the University of Coimbra, he has a solid international academic background (Chile, Spain, and Portugal) and several years of experience in higher education, applied research, and coaching professional and women’s football teams. As both a researcher and a coach, he developed the concept of the Specificity Index, an innovative metric that quantifies the internal logic of the game and training loads, with an emphasis on transfer to competition. This concept served as the foundation for the creation of his digital platform 3D Training Control® (www.3dtrainingcontrol.com) — an advanced tool for coaches and clubs aiming to plan, monitor, and optimise sports training using scientific and contextual indicators. He is the author of more than 15 international peer-reviewed publications in indexed journals and major scientific conferences, contributing to the fields of player profiling, multidimensional analysis, injury prevention, and physical-technical-tactical performance. Currently, he is a Visiting Assistant Professor at the University of Coimbra, a member of CIPER-FCDEFUC, and regularly serves as a thesis examiner for both master’s and doctoral students. Joel Barrera-Díaz é Professor Universitário, Investigador e Especialista em Treino Desportivo com foco no futebol de alto rendimento. Doutorado em Ciências do Desporto pela Universidade de Coimbra, possui uma sólida formação internacional (Chile, Espanha e Portugal) e com varios anos de experiência em ensino superior, investigação aplicada e treino de equipas de futebol profissionais e femininas. Como investigador e treinador, desenvolveu o conceito do Índice de Especificidade, uma métrica inovadora que permite quantificar a lógica interna do jogo e as cargas de treino, com foco na sua transferência para a competição. Esse conceito foi a base da criação da sua plataforma digital 3D Training Control® (www.3dtrainingcontrol.com) — uma ferramenta avançada para treinadores e clubes que desejam planear, monitorizar e otimizar o treino desportivo com base em indicadores científicos e contextuais. É autor de mais de 15 artigos científicos internacionais em revistas indexadas e congressos de referência, com contribuições nas áreas de perfil funcional de jogadores, análise multidimensional, prevenção de lesões e desempenho físico-técnico-tático. Atualmente é Professor Auxiliar Convidado na Universidade de Coimbra, membro do CIPER-FCDEF, e arguente regular em teses de mestrado e doutoramento.
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Identification

Personal identification

Full name
Joel Barrera-Díaz

Citation names

  • Barrera-Díaz, Joel

Author identifiers

Ciência ID
491D-0200-17CB
ORCID iD
0000-0002-9559-5048

Email addresses

  • jbd@fcdef.uc.pt (Professional)

Telephones

Mobile phone
  • 913040151 (Personal)

Websites

Languages

Language Speaking Reading Writing Listening Peer-review
Spanish; Castilian (Mother tongue)
Portuguese Upper intermediate (B2) Intermediate (B1) Beginner (A1) Upper intermediate (B2)
Education
Degree Classification
2024/09/02 - 2025/02/28
Concluded
 SPECIFICITY IN FOOTBALL: WHAT IT IS AND HOW IT IS MEASURED (Pós-doutoramento)
Major in Ciências do Desporto
Universidade de Coimbra Centro de Investigação do Desporto e da Actividade Física, Portugal
2022/09/01 - 2024/07/18
Concluded
 Master's in Sports Training (Mestrado)
Major in Soccer / Football
Universidade de Coimbra, Portugal
"RELATÓRIO DE ESTÁGIO NA EQUIPA SÉNIOR FEMININA UNIÃO RECREATIVA CADIMA DA II LIGA NACIONAL PORTUGUESA NA ÉPOCA 2023/24 “ÍNDICE DE ESPECIFICIDADE: A PEÇA QUE FALTA NO PUZZLE NA QUANTIFICAÇÃO DAS CARGAS DE TRABALHO NO FUTEBOL”" (THESIS/DISSERTATION)
2018/02/01 - 2023/09/18
Concluded
 PhD in Sports Sciences (Doutoramento)
Major in Specialization in sports training (Soccer / Football)
Universidade de Coimbra, Portugal
"FUNCTIONAL AND ACTIVITY PROFILES OF PROFESSIONAL FOOTBALL PLAYERS IN PORTUGAL - A MULTIDIMENSIONAL ANALYSIS." (THESIS/DISSERTATION)
2015/11/25 - 2017/10/31
Concluded
 Official Master of Sports Performance: Technique and High Level (Master Universitario)
Major in Collective Sports
Institut Nacional d'Educació Física de Catalunya, Spain
"“Transiciones Defensa-Ataque de los Equipos de Fútbol Finalistas de la Copa América Centenario 2016 EE.UU”" (THESIS/DISSERTATION)
 7.99
2015/02/18 - 2017/04/27
Concluded
 Football Coach (Diplôme d´études supérieures)
Major in Football / Soccer
I.P. Instituto Nacional del Fútbol, Deporte y Actividad Física (INAF), Chile
 6.0
2012/02/18 - 2016/01/07
Concluded
 Degree in Education - Teacher of Media Education in Physical Education (Diplôme d´études supérieures)
Major in School Sports Management
Universidad Católica Cardenal Raúl Silva Henríquez, Chile
"ESTUDIO CORRELACIONAL DE LOS FACTORES PROTECTORES DE LA SALUD AUTOESTIMA Y ACTIVIDAD FÍSICA, CON EL ESTADO NUTRICIONAL DE LOS ESTUDIANTES DE 4° Y 5° BÁSICO DEL LICEO A70" (THESIS/DISSERTATION)
 6.1
2012/02/18 - 2015/01/22
Concluded
 Monitor in Physical, Sports and Recreational Activities (Diplôme d´études supérieures)
Major in Sports
Universidad Católica Cardenal Raúl Silva Henríquez, Chile
 6.1
2005/02/15 - 2007/12/14
Concluded
 Higher Level Technician in Business Administration and Management (Diplôme d´études supérieures)
Major in Business Management
AIEP Instituto Profesional, Chile
 6.0
Affiliation

Teaching in Higher Education

Category
Host institution 		Employer
2023/09/01 - Current Invited Assistant Professor (University Teacher) Universidade de Coimbra Faculdade de Ciências do Desporto e Educação Física, Portugal
Universidade de Coimbra, Portugal
2017/07/01 - 2019/06/30 Associate Professor (University Teacher) Universidad Católica Cardenal Raúl Silva Henríquez, Chile
Universidad Católica Cardenal Raúl Silva Henríquez, Chile
2017/03/01 - 2018/12/10 Adjunct Teacher (Polytechnic Teacher) AIEP Instituto Profesional, Chile
AIEP Instituto Profesional, Chile

Others

Category
Host institution 		Employer
2022/02/16 - Current Member of the Interdisciplinary Centre for the Study of Human Performance (CIPER-FCDEF)) Universidade de Coimbra Faculdade de Ciências do Desporto e Educação Física, Portugal
Universidade de Coimbra Faculdade de Ciências do Desporto e Educação Física, Portugal
(...)
2021/04/22 - 2021/09/29 Optimization Office Coordinator and Head Coach of the U16 Team Associação Académica de Coimbra (AAC) Organismo Autónomo de Futebol (OAF), Portugal
Asociación Académica de Coimbra (AAC) Asociación Autónoma de Fútbol (OAF), Portugal
2019/12/01 - 2021/01/31 Head Coach of the Women's Senior Team União Recreativa de Cadima, Portugal
União Recreativa de Cadima, Portugal
Projects

Other

Designation Funders
2018/02/01 - 2022/06/30 FUNCTIONAL AND ACTIVITY PROFILES OF PROFESSIONAL FOOTBALL PLAYERS IN PORTUGAL - A MULTIDIMENSIONAL ANALYSIS
CE / FCDEF-UC / 00692021
Researcher
Universidade de Coimbra, Portugal
Ongoing
Outputs

Publications

Book chapter
  1. Professor Dr. Hugo Sarmento; Joao Bruno; Francisco Loureiro; Joel Barrera. "A importância da competição nos jovens". In O ABC do Futebol de Formação. Portugal: Primebooks: Lisboa, 2021.
    Published
Conference abstract
  1. Ricardy, Mauricio; Barrera-Díaz, Joel; Diogo Ferreira Mendes; Luz, Leonardo; António Figueiredo; Luis Manuel Rama. Corresponding author: Ricardy, Mauricio. "Comportamento ativo de futebolistas portugueses (Sub19) fora do treinamento". Paper presented in Congresso Internacional de Educação Física - FIEP 2024, Foz do Iguaçu, 2024.
    Published
  2. Barrera-Díaz, Joel; Diogo Mendes; António Figueiredo; Hugo Sarmento. Corresponding author: Barrera-Díaz, Joel. "Fitness Coaches in Professional Soccer: a qualitative study". Paper presented in World Congress on Science and Football 2023, Groningen, 2023.
  3. Barrera-Díaz, Joel; Diogo Mendes; António Figueiredo; Clemente, Filipe Manuel; Hugo Sarmento. Corresponding author: Barrera-Díaz, Joel. "Injury Prevention in Men's Football". Paper presented in World Congress on Science and Football 2023, Groningen, 2023.
Conference poster
  1. Barrera, Joel; Professor Dr. Hugo Sarmento; Professor Dr. Filipe Manuel Clemente; Professor Dr. Adam Field; Professor Dr. António J. Figueiredo. "The influence of playing position and contextual factors on running performance in professional portuguese soccer players". Paper presented in World Congress on Science and Soccer, 2022.
  2. Barrera, Joel; Professor Dr. Hugo Sarmento; Joao Duarte; Professor Dr. Adam Field; Professor Dr. António J. Figueiredo. "High isokinetic testing speeds are correlated with linear sprint performance". Paper presented in World Congress on Science and Soccer, 2022.
Journal article
  1. Hugo Sarmento; Diogo V. Martinho; Élvio R. Gouveia; José Afonso; Pawel Chmura; Adam Field; Nestor Ordoñez Savedra; et al. "The Influence of Playing Position on Physical, Physiological, and Technical Demands in Adult Male Soccer Matches: A Systematic Scoping Review with Evidence Gap Map". Sports Medicine (2024): http://dx.doi.org/10.1007/s40279-024-02088-z.
    10.1007/s40279-024-02088-z
  2. Luis Valenzuela Contreras; Rodrigo Villaseca-Vicuña; Alvaro Segueida-Lorca; Carolina Morales Ríos; Johana Osorio Aud; Joel Barrera Díaz. "Comparación de la composición corporal y rendimiento físico según sexo y su relación entre variables en estudiantes universitarios de educación física de Santiago de Chile (Comparison of body composition and physical performance according to sex and their relationship between variables in physical education university students from Santiago de Chile)". Retos (2024): https://doi.org/10.47197/retos.v56.103220.
    10.47197/retos.v56.103220
  3. Joel Barrera-Díaz; António J. Figueiredo; Adam Field; Bruno Ferreira; Sérgio M. Querido; João Renato Silva; João Ribeiro; et al. "Contemporary practices of physical trainers in professional soccer: A qualitative study". Frontiers in Psychology 14 (2023): http://dx.doi.org/10.3389/fpsyg.2023.1101958.
    10.3389/fpsyg.2023.1101958
  4. Barrera, Joel; J. Figueiredo, António; Duarte, João; Field, Adam; Sarmento, Hugo. "Predictors of linear sprint performance in professional football players". Biology of Sport 40 2 (2023): 356-364. http://dx.doi.org/10.5114/biolsport.2023.114289.
    Published • 10.5114/biolsport.2023.114289
  5. Barrera-Díaz, Joel. "Attitudes on gender equality in soccer among primary and secondary students in Santiago de Chile". Journal of Physical Education and Sport 23 4 (2023): 965-974. https://efsupit.ro/images/stories/aprilie2023/Art%20121.pdf.
    Open access • Published • 10.7752/jpes.2023.04121
  6. António Nóbrega; Hugo Sarmento; Vasco Vaz; Vítor Gouveia; Joel Barrera; Andreia Martins; Tomás Santos; João Pedro Duarte. "Reliability of the Coimbra Reactive Agility Soccer Test (CRAST)". Journal of Functional Morphology and Kinesiology (2023): https://doi.org/10.3390/jfmk8010011.
    10.3390/jfmk8010011
  7. Joel Barrera-Díaz. "Comparación del rendimiento aeróbico y la composición corporal según la posición de juego y su relación entre variables en futbolistas profesionales femeninas". Journal of Physical Education and Sport (2022): https://efsupit.ro/images/stories/octombrie2022/Art%20290.pdf.
    10.7752/jpes.2022.10290
  8. Joel Barrera. "Injury Prevention Programmes in Male Soccer Players: An Umbrella Review of Systematic Reviews". Journal of Men's Health 18 10 (2022): 200-200. http://dx.doi.org/10.31083/j.jomh1810200.
    10.31083/j.jomh1810200
  9. Joel Barrera. "Us versus them mentality in football fans: Significant social defeat engages the mentalization network and disengages cognitive control areas". F1000Research (2022): http://dx.doi.org/10.12688/f1000research.124559.1.
    10.12688/f1000research.124559.1
  10. Álvaro Segueida-Lorca; Barrera, Joel; Luis Valenzuela-Contreras; Tomás Herrera-Valenzuela. Corresponding author: Álvaro Segueida-Lorca. "Comparación de la composición corporal de futbolistas jóvenes categorizados por Bio-Banding". apunts 140 (2022): 45-52. https://revista-apunts.com/comparacion-de-la-composicion-corporal-de-futbolistas-jovenes-categorizados-por-bio-banding/.
    Accepted
  11. Ortiz Marholz, Paula Francisca; Valenzuela Contreras, Luis Marcel; Barrera Diaz, Joel. "Niveles de Ansiedad Rasgo y Bienestar en jugadores de fútbol profesional de Chile durante la cuarentena por COVID-19 (Levels of Trait Anxiety and Well-being in Chilean professional soccer players during the COVID-19 quarantine)". Retos 44 (2022): 1037-1044. http://dx.doi.org/10.47197/retos.v44i0.91316.
    10.47197/retos.v44i0.91316
  12. Rosa, F.; Sarmento, H.; Duarte, J.P.; Barrera, J.; Loureiro, F.; Vaz, V.; Saavedra, N.; Figueiredo, A.J.. "Knee and hip agonist-antagonist relationship in male under-19 soccer players". PLoS ONE 17 4 April (2022): http://www.scopus.com/inward/record.url?eid=2-s2.0-85128448465&partnerID=MN8TOARS.
    10.1371/journal.pone.0266881
  13. Lillian Gonçalves; Filipe Manuel Clemente; Joel Ignacio Barrera; Hugo Sarmento; Gibson Moreira Praça; André Gustavo Pereira de Andrade; António José Figueiredo; et al. "Associations between Physical Status and Training Load in Women Soccer Players". International Journal of Environmental Research and Public Health 18 19 (2021): 10015-10015. https://doi.org/10.3390/ijerph181910015.
    10.3390/ijerph181910015
  14. Lillian Gonçalves; Filipe Manuel Clemente; Joel Ignacio Barrera; Hugo Sarmento; Francisco Tomás González-Fernández; Luiz H. Palucci Vieira; António José Figueiredo; Cain C. T. Clark; J. M. Cancela Carral. "Relationships between Fitness Status and Match Running Performance in Adult Women Soccer Players: A Cohort Study". Medicina 57 6 (2021): 617-617. https://doi.org/10.3390/medicina57060617.
    10.3390/medicina57060617
  15. Joel Barrera; Hugo Sarmento; Filipe Manuel Clemente; Adam Field; António J. Figueiredo. "The Effect of Contextual Variables on Match Performance across Different Playing Positions in Professional Portuguese Soccer Players". International Journal of Environmental Research and Public Health (2021): https://doi.org/10.3390/ijerph18105175.
    10.3390/ijerph18105175
  16. Lillian Gonçalves; Filipe Manuel Clemente; Joel Ignacio Barrera; Hugo Sarmento; Francisco Tomás González-Fernández; Markel Rico-González; José María Cancela Carral. "Exploring the Determinants of Repeated-Sprint Ability in Adult Women Soccer Players". International Journal of Environmental Research and Public Health 18 9 (2021): 4595-4595. https://doi.org/10.3390/ijerph18094595.
    10.3390/ijerph18094595
  17. Barrera, J.; Contreras, L.V.; Lorca, Á.S.; Cid, F.M.; Zurita, E.; Sarmento, H.. "Relationship of counter-movement jump and speed tests (10-30 m) and agility in young Chilean soccer players,Relación del salto contramovimiento y pruebas de velocidad (10-30 m) y agilidad en jóvenes futbolistas chilenos". Retos 41 (2021): 775-781. http://www.scopus.com/inward/record.url?eid=2-s2.0-85103780142&partnerID=MN8TOARS.
    10.47197/RETOS.V41I0.85494
  18. Barrera, J.; Contreras, L.V.; Cid, F.M.; Sarmento, H.. "Analysis of the physical and anthropometric components of young Chilean footballers from category Sub-13 to Sub-19,Análisis de los componentes físicos y antropométricos de jóvenes futbolistas chilenos desde la categoría Sub-13 a Sub-19". Retos 39 (2021): 547-555. http://www.scopus.com/inward/record.url?eid=2-s2.0-85092240152&partnerID=MN8TOARS.
    10.47197/retos.v0i39.79537
Report
  1. Joel Barrera; Antonio J. Figueiredo; Filipe Manuel Clemente; José Afonso; Adam Field; Luis Valenzuela; Hugo Sarmento. 2021. Injury prevention protocols in male soccer players: an umbrella review of systematic reviews and meta-analyses. https://doi.org/10.37766/inplasy2021.9.0066.
    10.37766/inplasy2021.9.0066
Activities

Oral presentation

Presentation title Event name
Host (Event location)
2023/01/28 Quantifying the specificity of football training exercises XIX Congresso de Ciências do Desporto e Educação Física dos Países de Língua Portuguesa
Faculdade de Ciências do Desporto e Educação Física da Universidade de Coimbra (Coimbra, Portugal)
2023/01/28 Physical trainers in modern football: a qualitative study XIX Congresso de Ciências do Desporto e Educação Física dos Países de Língua Portuguesa
Faculdade de Ciências do Desporto e Educação Física da Universidade de Coimbra (Coimbra, Portugal)
2023/01/28 Injury prevention in male football players: an overview of systematic reviews XIX Congresso de Ciências do Desporto e Educação Física dos Países de Língua Portuguesa
Faculdade de Ciências do Desporto e Educação Física da Universidade de Coimbra (Coimbra, Portugal)
2021/11/06 Sports motivation scale in young Chilean football players: a descriptive study XXII JORNADAS DA SOCIEDADE PORTUGUESA DE PSICOLOGIA DO DESPORTO
Politécnico de Leiria (Leiria, Portugal)
2021/11/06 Analysis of collective behaviors in the defense-attack transition of the Copa America Centenário finalist teams XXII JORNADAS DA SOCIEDADE PORTUGUESA DE PSICOLOGIA DO DESPORTO
Politécnico de Leiria (Leiria, Portugal)
2021/10/16 IMPACT OF CONTEXTUAL VARIABLES ON THE PERFORMANCE OF PORTUGUESE FOOTBALL PLAYERS 9º CONGRESSO DA SOCIEDADE CIENTÍFICA DE PEDAGOGIA DO DESPORTO ¿ INOVAÇÃO E TECNOLOGIA NO DESPORTO
Politécnico de Leiria (Leiria, Portugal)
2021 Asymmetry on isokinetic strength in male professional soccer players Sports Sciences Congress 2021
Universidade de Lisboa (Lisboa, Portugal)
2020/07/17 "Women's football: the reality of the Portuguese league (Liga BPI)" Seminario Internacional de Ejercicio Físico en tiempos de pandemia
Universidad Bernardo O´Higgins (Santiago, Chile)
2018/06/04 Football in Training Curso Complementarem Futebol
Universidad de Coimbra (Coimbra)

Event organisation

Event name
Type of event (Role) 		Institution / Organization
2021/06/22 - 2021/06/25 JOEL BARRERA Fez parte da comissão organizadora do Curso Complementar em Futebol, realizado nos dias 22, 23, 24 e 25 de junho de 2021, na Faculdade de Ciências do Desporto e Educação Física da Universidade de Coimbra. O curso teve uma carga horária de 35h (2021/06/22 - 2021/06/25)
Conference (Member of the Organising Committee)
 Universidade de Coimbra, Portugal
2018/06/04 - 2018/06/07 Complementary Course in Soccer (2018/06/04 - 2018/06/07)
Other (Member of the Organising Committee)
 Universidade de Coimbra, Portugal
2018/05/18 - 2018/05/18 Trends in Planning and Periodization of Training in Collective Sports Games. (2018/05/18 - 2018/05/18)
Other (Member of the Organising Committee)
 Universidade de Coimbra, Portugal
2018/03/02 - 2018/03/02 XVII INTERNATIONAL SPORTS FORUM (2018/03/02 - 2018/03/02)
Other (Member of the Organising Committee)
 Universidade de Coimbra, Portugal

Event participation

Activity description
Type of event 		Event name
Institution / Organization
2024/04/08 - Current 3D Training Control: Innovation in the training monitoring and control process
Exhibition
Universidade de Coimbra, Portugal
2021/03/31 - 2021/03/31 Joel Barrera portador do NIF nº 300312660 participou na ação de formação à distância com o código nº202527275, intitulada "SER TREINADOR", realizada no dia 31 de março, com a duração de 2 horas, creditada com 0,4 Unidades de Crédito.
Other
 "SER TREINADOR"
Confederação de Treinadores de Portugal, Portugal
2016/07/07 - 2016/07/07 First Response Workshop in the Face of a Health Emergency
Workshop
 Taller Primera Respuesta Frente a Emergencia Salud
Asociacion Chilena de Seguridad, Chile
2014/08/27 - 2014/08/27 International Seminar on Physical Activity and Public Health
Seminar
 Seminario Internacional de Actividad Física y Salud Publica
Universidad Católica Cardenal Raúl Silva Henríquez, Chile
2014/06/06 - 2014/06/07 3rd Football Training Seminar
Seminar
 3er Seminario de Entrenamiento en el Fútbol
Instituto Profesional de Chile, Chile
2013/08/28 - 2013/08/29 Overload Training and Maturation
Seminar
 Overload Training and Maturation
Universidad Católica Cardenal Raúl Silva Henríquez, Chile

Jury of academic degree

Topic
Role 		Candidate name (Type of degree)
Institution / Organization
2025/04/01 SOCCER MATCH ANALYSIS: A MULTIDIMENSIONAL STUDY OF THE DEVELOPMENT PROCESS OF YOUTH PLAYERS
(Thesis) Arguer
 Eder Gonçalves (PhD)
Universidade de Coimbra Faculdade de Ciências do Desporto e Educação Física, Portugal
2025/02/13 RELATÓRIO DE ESTÁGIO CURRICULAR, DESENVOLVIDO NO SPORTING CLUBE DA COVILHÃ, JUNTO DA EQUIPA SUB-17, NA ÉPOCA DESPORTIVA 2023/2024 "Penáltis no Futebol – Impacto e Características de Sucesso"
(Thesis) Main arguer
 João Miguel Traquina André (Master)
Universidade de Coimbra Faculdade de Ciências do Desporto e Educação Física, Portugal
2025/01/10 Os efeitos da substituição do treinador de futebol profissional no perfil de atividade dos jogadores em treino e competi
(Thesis) Arguer
 Honorato José Santos Correia de Sousa (PhD)
Universidade de Coimbra Faculdade de Ciências do Desporto e Educação Física, Portugal
2024/11/22 IMPACTO DO ESTADO DE FLOW NA INTELIGÊNCIA TÁTICA DE JOVENS E ADULTOS JOGADORES DE HANDEBOL
(Thesis) Arguer
 Luis Eugênio Martiny (PhD)
Universidade de Coimbra Centro de Investigação do Desporto e da Actividade Física, Portugal
2024/02 RELATÓRIO DE ESTÁGIO DESENVOLVIDO NO CLUB SPORT MARÍTIMO COM A EQUIPA DE JUVENIS “A” (SUB-17) “AVALIAÇÃO CARDIORRESPIRATÓRIA EM JOVENS ATLETAS DE FUTEBOL COM UTILIZAÇÃO DO COSMED K5”
(Thesis) Main arguer
 José Miguel Neves Paiva (Master)
Universidade de Coimbra, Portugal
2023/09 RELATÓRIO DE ESTÁGIO DESENVOLVIDO NA EQUIPA SUB-17 MASCULINA DO ATLÉTICO CLUBE MONTEMORENSE NA ÉPOCA 2022/2023 “Os Efeitos da Creatina nos Jovens Jogadores de Futebol”
(Thesis) Main arguer
 Rúben Alexandre Fernandes Almeida (Master)
Universidade de Coimbra, Portugal
2023/09 RELATÓRIO DE ESTÁGIO DESENVOLVIDO NA EQUIPA SUB-14 MASCULINA DO SPORTING CLUBE RIBEIRENSE, NA ÉPOCA 2022/2023 “Relative age effect as an exclusion factor in the recruitment of young athletes in soccer”
(Thesis) Main arguer
 João Pedro Bernardino Silva (Master)
Universidade de Coimbra, Portugal