V. Martinho, Diogo http://orcid.org/0000-0003-0825-4032
Valente-dos-Santos, João http://orcid.org/0000-0003-0980-0269
Coelho-e-Silva, Manuel J. http://orcid.org/0000-0003-4512-7331
Gutiérrez, Arturo O. http://orcid.org/0000-0001-9158-5160
Duarte, João P. http://orcid.org/0000-0002-7536-9780
Lourenço-Farinha, Pedro http://orcid.org/0000-0002-4124-6109
Luz, Leonardo G. O. http://orcid.org/0000-0003-1436-1125
Gonçalves-Santos, João http://orcid.org/0000-0001-7672-680X
Machado, Dalmo R. L. http://orcid.org/0000-0001-7327-0800
Leite, Neiva http://orcid.org/0000-0002-4752-6697
Conde, Jorge http://orcid.org/0000-0002-2225-8569
Castanheira, Joaquim M. http://orcid.org/0000-0002-3552-2912
Cumming, Sean P. http://orcid.org/0000-0003-1705-9642
Sherar, Lauren B. http://orcid.org/0000-0002-9942-5433
Malina, Robert M. http://orcid.org/0000-0003-4049-2620
Funding for this research was provided by:
Portuguese Foundation for Science and Technology (uid/dtp/04213/2020, SFRH/BD/121441/2016, SFRH/BPD/100470/2014)
Mexican Government (Secretaria de Educação Publica)
Article History
Received: 9 August 2019
Accepted: 24 March 2020
First Online: 13 April 2020
Ethics approval and consent to participate
: The research was approved by the Ethics Committee of the University of Coimbra [CE/FCDEF-UC/00122014]. A signed inter-institutional agreement was performed with the Portuguese Institute of Sports and Youth [IPDJ/FCDEF.UC/2017–01]. Participants voluntarily visited the Center for Sports Medicine as part of the required medical examination for registration in the Portuguese Soccer Federation (Law 204/2006; act 11/2012). Parents or legal guardians and the players provided written consent; the players were advised that their participation was voluntary and that they could withdraw from the study at any time.
: Not applicable.
: JVS is an editorial board member of BMC Pediatrics. All other authors declare that they do not have any competing interest.