88511 20200716101550.0 doi 10.1177/1754337119872418 sideral 114159 ART-2019-114159 eng (orcid)0000-0002-9191-9033 Muñiz-Pardos, Borja Validity and reliability of an optoelectronic system to measure movement velocity during bench press and half squat in a Smith machine 2019 Access copy available to the general public Unrestricted The purpose of this study was to determine the validity and reliability of a camera-based optoelectronic system to measure movement velocity during bench press and half squat at different load intensities. A total of 22 active males (age: 28.2 +/- 3.9 years; one-repetition maximum bench press: 77.9 +/- 19.0 kg; one-repetition maximum half squat: 116.6 +/- 22.5 kg) participated in this study. After an initial one-repetition maximum testing session, participants performed five repetitions for each load (40%, 60% and 80% one-repetition maximum) and exercise (bench press and half squat) on a Smith machine in the second testing session. A third testing session was used for the test-retest reliability study. Time, displacement and mean propulsive velocity were simultaneously determined by the reference method (T-Force system) and the Velowin system. In bench press, ordinary least products regression analysis revealed low fixed biases for mean propulsive velocity at 40%, time at 60% and displacement at 80% one-repetition maximum (intercept = 0.065 m s(-1), -28.02 ms and 0.87 cm, respectively). In half squat, low fixed biases were also detected for mean propulsive velocity at 40% and 80% one-repetition maximum (intercept = -0.040 and 0.023 m s(-1), respectively), time at 40% and 60% one-repetition maximum (intercept = -53.05 and -101.85 ms, respectively) and displacement at 60% one-repetition maximum (intercept = -1.95 cm). Proportional bias was only observed for mean propulsive velocity at 80% bench press. In half squat, there was proportional bias for time and mean propulsive velocity at 40% one-repetition maximum, and also for time at 60% one-repetition maximum. The reliability test showed low and comparable fixed and proportional biases between systems across exercises and intensities. Velowin confirmed to be a valid and reliable system to measure movement velocity across a wide range of intensities (40%-80% one-repetition maximum) for two basic strength exercises through a robust statistical approach. Velowin would provide coaches and trainers with a suitable, affordable and easy-to-use equipment capable of measuring movement velocity in various exercises at different load intensities. info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 1.0 2019 SPORT SCIENCES 77 / 85 = 0.906 2019 Q4 T3 ENGINEERING, MECHANICAL 112 / 130 = 0.862 2019 Q4 T3 0.351 2019 Engineering (miscellaneous) 2019 Q2 Sports Science 2019 Q4 info:eu-repo/semantics/conferenceObject info:eu-repo/semantics/acceptedVersion (orcid)0000-0002-0137-9900 Lozano-Berges, Gabriel Universidad de Zaragoza (orcid)0000-0002-1042-542X Marin-Puyalto, Jorge Universidad de Zaragoza (orcid)0000-0002-1132-5906 Gonzalez-Aguero, Alex Universidad de Zaragoza (orcid)0000-0002-4303-4097 Vicente-Rodriguez, German Universidad de Zaragoza (orcid)0000-0002-7215-6931 Casajús, José A. Universidad de Zaragoza (orcid)0000-0001-8374-9081 Garatachea, Nuria Universidad de Zaragoza 1006 245 Universidad de Zaragoza Dpto. Fisiatría y Enfermería Área Educación Física y Depor. 234, 1 (2019), 88-97 PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART P-JOURNAL OF SPORTS ENGINEERING AND TECH PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART P-JOURNAL OF SPORTS ENGINEERING AND TECHNOLOGY 1754-3371 141293 http://zaguan.unizar.es/record/88511/files/texto_completo.pdf Postprint 270906 http://zaguan.unizar.es/record/88511/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:88511 articulos driver 2020-07-16-09:45:47 ARTICLE