Authors
Álvaro Huerta Ojeda, Guillermo Barahona-Fuentes, Rodrigo Beltrán-Inostroza, Carlos Jorquera-Aguilera, María-Mercedes Yeomans-Cabrera, Maximiliano Torres-Banduc
Published in
PeerJ. Volume 14. Pages e21357. Epub Jul 15, 2026.
Abstract
Velocity-based training has emerged as a leading approach for quantifying training loads. Therefore, valid and reliable devices must be used to evaluate both movement velocity and power.
This study determined the validity and reliability of the Valkyria Trainer Free® linear position transducer (VTF® LPT) during the propulsive phase of the bench press in physically healthy individuals.
Nineteen physically healthy men participated in the study (22.7 ± 2.1 years). A repeated-measures design was used to compare the inter-day test-retest reliability of velocity and power, while validity was determined by comparing the VTF® LPT with the Chrono-Jump® LPT. The analysis consisted of the intraclass correlation coefficient (ICC), standard error of measurement (SEM), and coefficient of variation (CV) for slow velocity zone: 0.08-0.49 m·s-1, power zone: 0.50-0.99 m·s-1, and fast velocity zone: 1.00-1.56 m·s-1. A CV ≤ 10% and an ICC ≥ 0.80 were considered acceptable reliability, whereas a CV ≤ 5% and an ICC ≥ 0.90 were considered high reliability.
For vertical velocity, the "power zone" and "fast velocity zone" showed a high threshold for CV (≤5%), while the "slow velocity zone" showed an acceptable threshold with a CV of 7.94. For power, the "slow velocity zone" showed an acceptable threshold for CV (≤10%), while the "fast velocity zone" and "power zone" showed a CV equivalent to 10.8 and 4.8%, respectively.
The study's results demonstrated that VTF® LPT is valid and reliable for assessing velocity and power in physically healthy individuals.
PMID:
42472305
Bibliographic data and abstract were imported from PubMed on 19 Jul 2026.
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