Text and Data Mining valid from 2018-03-02
Received: 1 June 2017
Accepted: 24 February 2018
First Online: 2 March 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All studies performed involving human participants were in accordance with the ethical standards of the Scientific Council of the Faculty of Sport from the University of Porto and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.