1. Department of Physiology, The Nippon Dental University School of Life Dentistry at Niigata, Niigata 951-8580, Japan
2. Bando Dental Clinic, Ishikawa 920-0922, Japan
3. Department of Sports Science, Kanazawa Gakuin University of Sport Science, Ishikawa 920-1392, Japan
4. Japan Gymnastics Association Trampoline Committee, Tokyo 160-0013, Japan
5. Japan Gymnastics Association Trampoline Reinforcement Headquarters, Tokyo 160-0013, Japan
6. Faculty of Sport Science, Nippon Sport Science University, Tokyo 158-8508, Japan