20120329615 | FITNESS DEVICE, EXERCISE MANAGEMENT SYSTEM USING SAME, AND METHOD FOR MANAGING EXECISE - A fitness device using air pressure of a cylinder as an exercise load. The fitness device includes an air cylinder in which air pressure is maintained according to an exercise load value; a position recognition sensor for generating a position recognition signal when a piston of the air cylinder approaches a set position of a load increase of a top or a bottom of a cylinder; a controller for generating a load increase signal for increasing exercise load according to the position recognition signal; and an electric pneumatic proportion control valve for maintaining air pressure value of the air cylinder according to the exercise load value set by the controller and for increasing the air pressure of the air cylinder by 10˜20% for a predetermined time by receiving the load increase signal. | 12-27-2012 |