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Validation of an opto-electronic instrument for the measurement of weighted countermovement jump execution velocity

2018; Taylor & Francis; Volume: 20; Issue: 2 Linguagem: Inglês

10.1080/14763141.2018.1526316

1752-6116

Guillermo Peña García-Orea, Noelia Belando‐Pedreño, Juan Andrés Merino-Barrero, Abel Jiménez-Ruiz, Juan Ramón Heredia Elvar,

Sports Dynamics and Biomechanics

The purpose of this study was to analyse the reliability and validity of an opto-electronic sensor system (Velowin) compared to a linear velocity transducer (T-Force System) considered as the gold standard. Mean velocity (MV) and peak velocity (PV) generated in the Smith machine bar placed on the shoulders in counter-movement jump exercise (CMJ) were analysed. The study was conducted with a sample of 21 men with experience in resistance training. Five measurements were analysed for CMJ exercise in concentric phase using a progressive loading increase. Three jumps were made per load with a 3–4 min recovery between loads. The analysis of the variance confirmed that there were no significant differences (p > 0.05) in the execution velocity between Velowin and T-Force with each of the loads. The reliability analysis showed, with each of the loads, high values of the intraclass correlation coefficient (ICC = 0.95–0.99) and a 'substantial' Lin´s concordance coefficient in MV (CCC ≥0.96) and between 'substantial' (CCC = 0.98) and 'almost perfect' (CCC = 0.99) in PV. These results confirm the reliability and validity of the Velowin device is reliable for measuring the execution velocity in loaded CMJ exercise.