engleski

Test-Retest Reliability and Validity of the Velocity- Based Training Device for Measuring Kinetics and Kinematics Variables in Youth Soccer Players

Velocity-based training (VBT) is a popular method for prescribing and monitoring resistance-training load. The aim of this study was to investigate the reliability and validity of the PUSH band for measuring kinetics and kinematics variables during the deadlift exercise at different loads. 16 soccer players (16-18 years) underwent VBT 1 repetition maximum (1RM) protocol over two testing sessions (test-retest). Inertial sensor PUSH Band 2.0 was used for measuring velocity, power, and force during executing hexagonal-bar deadlift at different percentages of 1RM. Test-retest reliability of the VBT-variables was determined by Pearson’s correlation coefficients and Bland- Altman plots. Validity was determined by correlating VBT-variables with the Broad jump test (BJ). Average-power, average-, and peak- velocity at 45% 1RM, peak-power at 55% 1RM, average-force and peak-power at 65% 1RM, average- and peak-power at 75% 1RM displayed proper test- retest reliability (>50% of the shared variance), which was confirmed by Bland-Altman plots. Average-power, average- and peak-velocity at 45% 1RM displayed the highest correlations with BJ (r=0.78, 0.73, and 0.76, respectively), indicating good validity. VBT-variables at moderate loads were more reliable, which could be explained by the low experience in resistance training of studied players. Variables at low-to- moderate intensity displayed the highest correlation/validity with BJ and could be recommended for the development of this jumping performance in youth players.

resistance training ; feedback ; youth athletes ; strength and conditioning ; inertial sensors

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