EVALUATION OF RELIABILITY AND CONCURRENT VALIDITY OF INEXPENSIVE AND EXPENSIVE SYSTEMS USED FOR RECORDING MAXIMUM VERTICAL JUMP PERFORMANCE

The reliability and validity of two alternative systems used for jumping performance measurement was evaluated. Two groups of subjects consisted of 15 male adults and the 16 female volleyball players. We used three different systems of data collection: Optojump Next (optoelectric) referred as the inexpensive system, BTS Smart-E (motion capture) as the expensive system. Concurrent validity of these systems was checked with the use of standard force platform. All systems were used to estimate the height of vertical jumps. Both systems showed highly reliability with the ICCs=0.98 for Optojump and 0.90 for BTS Smart. Their concurrent validity with the force platform data was also very high r=0.99 and r=0.97 respectively. Comparison of these two systems demonstrated distinct differences between the two systems: Optojump system is more suitable for quick and reliable sports testing