Footnotes

• Twitter @Costa_JAH

• Collaborators Supervised by Dr António Rebelo, PhD, and co-supervised by Dr João Brito, PhD, and Dr Eduardo Oliveira, PhD. Collaborators: Professor Dr Fábio Yuzo Nakamura, PhD, Professor Dr Pedro Figueiredo, PhD, Professor Dr Ovídio Costa, PhD and Professor Dr Vincenzo Rago, PhD.

• Contributors Ph.D. degree in Sports Science and designed by the Center of Research, Education, Innovation and Intervention in Sport (CIFI2D), Faculty of Sport, University of Porto and Portugal Football School, Portuguese Football Federation (FPF), Oeiras, Portugal. Supervised by António Rebelo, Ph.D., and co-supervised by João Brito, Ph.D., and Eduardo Oliveira, Ph.D. João Brito and António Natal contributed to conceptualisation. JAHC contributed to conceptualisation, data curation, formal analysis, funding acquisition, investigation, methodology, visualisation, writing–original draft, writing– review & editing. João Brito, Eduardo Oliveira and António Natal contributed to investigation, methodology, supervision, Writing – review & editing. João Brito and António Natal contributed to project administration. António Rebelo contributed to validation.

• Funding FIFA Research Scholarship 2017 (International Centre for Sports Studies (CIES) and Fédération Internationale de Football Association (FIFA)) funded the study. The study was also supported by Fundação para a Ciência e a Tecnologia: SFRH/BD/128531/2017.

• Competing interests None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.