1. Department of Mechanical Systems Engineering, Faculty of Engineering, Daiichi Institute of Technology, 1-10-2 Kokubuchuo, Kirishima 899-4395, Japan
2. Department of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan
3. Course of Physical Therapist, Department of Rehabilitation, Faculty of Health Sciences, Tohoku Fukushi University, 1-8-1 Kunimi Aoba-ku, Sendai 981-8522, Japan
4. Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan