Text and Data Mining valid from 2019-03-21
Received: 23 October 2018
Accepted: 26 February 2019
First Online: 21 March 2019
Ethics approval and consent to participate
: The subjects were informed of the study goals and test protocols before giving their signed informed consent for participation. The study protocol received approval from the the Local Bioethics Committee (certificate of approval No. 4/2013) of the Jerzy Kukuczka Academy of Physical Education in Katowice (Poland) according to the principles and policies of the Declaration of Helsinki.
: Not applicable.
: The authors declare no conflict of interest.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.