1. Biomechanics and Mechatronics Research Groups, Department of Mechanics, MEU Building, Of. MEU-320D, Simón Bolívar University, Caracas 1080A, Venezuela e-mail:
2. Biomechanics and Mechatronics Research Groups, Department of Mechanics, ELE Building, Of. ELE-205, Simón Bolívar University, Caracas 1080A, Venezuela e-mail: