Cybex II-Data Acquisition System

The purpose of this paper was to describe a mechanical system that can be used to accurately and objectively record muscle torque and its reliability. The system includes a Cybex II dynamometer and a simple microprocessor that digitalizes the analog signal from the Cybex II. Therefore, the system eliminates the subjectivity of reading the torque recording from the typical Cybex II paper recording. After digitalizing the analog signal from the Cybex II, the Cybex 11-Data Acquisition System determines the maximum torque in millivoltage and displays the maximum millivoltage recorded over a specified time period. Reliability of the system for dead weights was r = 0.99 (P </= 0.05). The data acquisition system in conjunction with the Cybex II dynamometer was confirmed as accurate instrumentation for the measurement of loads applied to the Cybex II. J Orthop Sports Phys Ther 1981;2(4):177-179.