Validity and reliability of a mobile application for velocity–Based training (VBT) in the bench press exercise

• Published in: Hrvatski športskomedicinski vjesnik Vol. 39; no. 2; pp. 109 - 117
• Main Authors: Baković, Marijo, Šagovac, Antonio
• Format: Journal Article
• Language: English
• Published: 2024
• ISSN: 0354-0766; 1848-7742
• DOI: 10.69589/hsv.39.2.6

The aim of this study was to determine the validityand reliability of Metric VBT mobile application duringthe bench press exercise. The research was attended byfifteen male participants (age 24.2 ± 1.6 years; height 183.8± 7.51 cm; weight 87.8 ± 8.5 kg) with experience in strengthtraining and bench press exercise for at least two years.Participants were required to perform three maximallyfast concentric repetitions at loads of 45%, 60% and 75%of 1RM in the bench press exercise. Movement velocitywas simultaneously recorded using the Vitruve measuringdevice and the Metric VBT mobile application.Results showed a statistically significant (p < 0.05),very strong correlations of the total number of repetitionsfor the variables of mean velocity (r = 0.93), peak velocity(r = 0.91) and strong correlations for range of motion (r= 0.75). Also, there was a statistically significant (p <0.05) medium to very strong correlation for individualloads in the variables of mean velocity (r = 0,47 to 0,89),peak velocity (r = 0,79 to 0,81) and range of motion (r =0,71 to 0,79). On the other side, reliability for individualrepetitions measured by intraclass correlation coefficient(ICC) indicates in existence of statistically significant (p <0.05) excellent reproducibility of results for mean velocity(ICC = 0,93 to 0,95), peak velocity (ICC = 0,89 to 0,97) andrange of motion (ICC = 0,95 to 0,97). Variation of resultswithin one subject for individual loads measured using thecoefficient of variation (CV) indicates an acceptable level ofvariability (<10%) for mean velocity (CV = 3.91 to 7.09%),peak velocity (CV = 4.90% to 9.41%) and range of motion(CV = 3.07% to 3.91%). Ultimately, the obtained resultssupport the use of the Metric VBT mobile application totrack movement velocity in the bench press exercise. Cilj ovoga rada bio je utvrditi valjanost i pouzdanost mobilne aplikacije Metric VBT u vježbi potisak s ravneklupe. Istraživanju je pristupilo petnaest muških ispitanika(dob 24,2 ± 1,6 godina; visina 183,8 ± 7,51 cm; tjelesna masa87,8 ± 8,5 kg) s iskustvom u treningu s opterećenjem te vježbipotisak s ravne klupe u trajanju od najmanje dvije godine.Od ispitanika se zahtijevalo izvođenje tri maksimalno brzakoncentrična ponavljanja pri opterećenjima od 45%, 60% i75% 1 RM-a u potisku s ravne klupe. Brzina pokreta mjerilase istovremeno pomoću Vitruve mjernog uređaja te mobilneaplikacije Metric VBT.Rezultati su utvrdili statistički značajnu, odnosno vrlojaku korelaciju za sva ponavljanja za varijable srednje (r =0,93) i vršne brzine (r = 0,91) te visoku korelaciju amplitudepokreta (r = 0,75). Također, postoji statistički značajnasrednja do vrlo jaka korelacija za pojedinačna opterećenjau varijablama srednje (r = 0,47 do 0,89) i vršne brzine (r= 0,79 do 0,81) te jaka korelacija amplitude pokreta (r =0,71 do 0,79). S druge strane, pouzdanost za pojedinačnaponavljanja mjerena intraklasnim koeficijentom korelacije(ICC) ukazuje u postojanje statistički značajne (p < 0,05)izvrsne ponovljivosti rezultata za varijable srednje (ICC =0,93 do 0,95) i vršne brzine (ICC = 0,89 do 0,97) te amplitudepokreta (ICC = 0,95 do 0,97). Varijacije rezultata unutarjednog ispitanika za pojedinačna opterećenja mjerenepomoću koeficijenta varijacije (CV) govore o prihvatljivojrazini varijabilnosti (<10%) za varijable srednje (CV =3,91% do 7,09%) i vršne brzine (CV = 4,90% do 9,41%)te amplitude pokreta (CV = 3,07% do 3,91%). Zaključno,utvrđeni rezultati podržavaju uporabu mobilne aplikacijeMetric VBT za praćenje brzine pokreta u vježbi potisak sravne klupe.