Correspondence:
Lorek Karolina,
address: Department of Kinesiology, Faculty of Physiotherapy, Wroclaw University of Health and Sport Science, Wroclaw, Poland; 51-612 Wroclaw, Al. Paderewskiego 35, building P4 telephone number: (+48) 71 347 3532; fax number: (+48) 71 347 3431e-mail address: karolina.lorek@awf.wroc.pl
Jarosław Marusiak,
address: Department of Kinesiology, Faculty of Physiotherapy, Wroclaw University of Health and Sport Science, Wroclaw, Poland; 51-612 Wroclaw, Al. Paderewskiego 35, building P4 telephone number: (+48) 71 347 3057; fax number: (+48) 71 347 3431e-mail address: jaroslaw.marusiak@awf.wroc.pl
Word countNumber of used words in the main text: 2497; Number of used words in abstract: 250