Validity of a novel inertial measurement unit to track barbell velocity / Validación de un nuevo sensor inercial para medir la velocidad de ejecución

The objective of this work is to analyze the reliability and validity of the new inertial measurement unit (IMU) PUSHTM Band2.0 to measure barbell velocity. Six healthy males (24.83±3.71years; 69.88±8.36kg; 175.92±4.5cm) participated in this studyand performed several sets on the bench press. Barbell concentric mean (MV) and peak (PV) velocity were recorded witha LT and the IMU. Pearson correlation coefficient shows a very high relationship for MV (r = 0.97; SEE: 0.08 m/s; 95%CI: 0.95-0.98; p< 0.001) and PV (r = 0.97; SEE: 0.13 m/s; 95%CI: 0.96-0.98; p< 0.001). There was a very high agreement for the values ofMV and PV (MV: ICC = 0.945, CI = 0.834–0.974, α = 0.981; PV: ICC = 0.926, CI = 0.708–0.969, α = 0.977). Paired sample t-testrevealed systematic bias for MV (p< 0.001; mean difference between instruments = 0.06 ± 0.09 m/s) and PV (p< 0.001; meandifference between instruments = 0.15 ± 0.18 m/s). Bland-Altman plots showed almost trivial and moderate relationships forMV (r2 = 0.1) and PV (r2 = 0.37). In conclusion, the PUSHTM Band 2.0 was proven to be a valid alternative for measuring barbellvelocity in the bench press.(AU)

El objetivo de este trabajo es analizar la fiabilidad y validez de la nueva unidad de medición inercial (IMU) PUSHTM Band 2.0para medir la velocidad de la barra. Seis hombres sanos (24.83 ± 3.71 años; 69.88 ± 8.36 kg; 175.92 ± 4.5 cm) participaron eneste estudio y realizaron varias series en el press de banca. La velocidad concéntrica de barra (MV) y la velocidad pico (PV)se registraron con un LT y la IMU. El coeficiente de correlación de Pearson muestra una relación muy alta para MV (r = 0.97;SEE: 0.08 m/s; IC 95%: 0.95-0.98; p <0.001) y PV (r = 0.97; SEE: 0.13 m/s; 95% IC: 0,96-0,98; p <0,001). Hubo un acuerdo muyalto para los valores de MV y PV (MV: ICC = 0.945, CI = 0.834–0.974, α = 0.981; PV: ICC = 0.926, CI = 0.708–0.969, α = 0.977). Laprueba t de muestras relacionadas reveló un sesgo sistemático para MV (p <0.001; diferencia media entre instrumentos = 0.06± 0.09 m/s) y PV (p <0.001; diferencia media entre instrumentos = 0.15 ± 0.18 m/s). Las gráficas de Bland-Altman mostraronrelaciones casi triviales y moderadas para VM (r2 = 0.1) y VP (r2 = 0.37). En conclusión, se demostró que PUSHTM Band 2.0 esuna alternativa válida para medir la velocidad de la barra en el press de banca.(AU)