1. College of Physical Education, Taiyuan University of Technology, Taiyuan City, Shanxi Province, P.R. China;
2. Department of Taekwondo, Woosuk University, Wanju-gun, North Jeolla Province, Republic of Korea;
3. School of Textile science and engineering, Xi’an Polytechnic University, Xi’an City, P.R. China;
4. College of Textile Engineering, Taiyuan University of Technology, Taiyuan City, Shanxi Province, P.R. China