Strength Test Performance Modification MAX 400KG For Sports Measurement and Evaluation Digital Base

This research aims to be able to make modifications to development tools back and leg dynamometer. Specific targets to be achieved in this research is the creation of modification tools back and leg dynamometer that can be used in accordance with current needs, where the back and leg dynamometer are currently only able to with stand the load resistance of up to 300kg, in fact in the last 2 years many athletes who have had the capability of more than 300 kg, thus the need for modifications to the development of back and leg dynamometer load is up to 400kg resistance. The study design of this research is the R & D (Research and Development). This research subjects was conducted in yogyakarta state university. The results of first years has been the completion of a prototype tool leg and back dynamometer innovative. In the 2nd year study shows that it has completed a prototype of a modified development tool back and leg dynamometer with capability of 400 kg. Created tools has advantages among others: the ability of measurement exceeds appliance standard (300 kg), has the ability to store data in memory on the tool developed, the framework materials using aluminum so it is not easy to rust, can be used indoors and outdoors (portable), display data with larger numbers and a strong light with LED Display, low energy. Product test results found that of the 280 athletes who followed the trial of the product in the form of test and measurement leg muscle strength are 14 athletes were found to have strength above 300 kg. Results of ultimate power reached 386 kg of wrestling athlets and track and filed up to 354 kg. From these results, it was concluded that the back and leg modification tool used to measure decent back and leg muscle strength with strength up to 400 kg.