Article History
Received: 7 January 2019
Accepted: 10 July 2019
First Online: 19 July 2019
Compliance with ethical standards
:
: All authors declare that they have no competing interests.
: The ethical committee of the Ruhr-Universität Bochum, Bochum, Germany, Faculty of Sports Science, declared no ethical objections to this study design.
: This article does not contain any studies with human participants or animals performed by any of the authors.