RELIABILITY OF KINETIC VARIABLES OF SQUAT JUMPS WITH DIFFERENT STARTING POSITIONS AFTER CRITERION BASED FAMILIARIZATION

The aim of this study were the verification of criterion based familiarization by Intraclass Correlation Coefficient (ICC) and Standard Error of Measurement (SEM) and the identification of possible differences of performance and dynamic variables at squat positions with 90o (SJ90 o) and 120o (SJ120 o) of knee angle. Fifteen male junior volleyball players performed three randomly performed jumps with maximal intensity from each squat position. SJ90 o results in lower peak force and higher vertical impulse, impulse duration and time for peak force than SJ120 o. ICC and SEM show that familiarization that consisted of three series of 5 jumps for each squat position with 1 minute of rest between the jumps, is sufficient to ensure adequate test conditions