Funding for this research was provided by:
Text and Data Mining valid from 2018-08-20
Received: 27 February 2018
Accepted: 7 August 2018
First Online: 20 August 2018
Ethics Approval and Consent to Participate
: All study activities involving human participants were in accordance with the ethical standards of the institutional ethics committee and with the principles of the 1964 Helsinki Declaration. All players gave their informed consent, and ethical clearance was obtained from Loughborough University Ethical Advisory Committee.
: No applicable.
: Aimee Mears, Alun Owen and Paul Osei-Owusu declare that they have no conflict of interest. Andy Harland and Jonathan Roberts have received research grants from FIFA and adidas for other research projects predating this manuscript.
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