Validity of a novel inertial measurement unit to track barbell velocity

Abstract

The objective of this work is to analyze the reliability and validity of the new inertial measurement unit (IMU) PUSHTM Band 2.0 to measure barbell velocity. Six healthy males (24.83±3.71years; 69.88±8.36kg; 175.92±4.5cm) participated in this study and performed several sets on the bench press. Barbell concentric mean (MV) and peak (PV) velocity were recorded with a 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 of MV 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-test revealed systematic bias for MV (p< 0.001; mean difference between instruments = 0.06 ± 0.09 m/s) and PV (p< 0.001; mean difference between instruments = 0.15 ± 0.18 m/s). Bland-Altman plots showed almost trivial and moderate relationships for MV (r2 = 0.1) and PV (r2 = 0.37). In conclusion, the PUSHTM Band 2.0 was proven to be a valid alternative for measuring barbell velocity in the bench press.

El objetivo de este trabajo es analizar la iabilidad y validez de la nueva unidad de medición inercial (IMU) PUSHTM Band 2.0 para medir la elocidad de la barra. Seis hombres sanos (24.83 ± 3.71 años; 69.88 ± 8.36 kg; 175.92 ± 4.5 cm) participaron en este 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 muy alto 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). La prueba 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 mostraron relaciones casi triviales y moderadas para VM (r2 = 0.1) y VP (r2 = 0.37). En conclusión, se demostró que PUSHTM Band 2.0 es una alternativa válida para medir la velocidad de la barra en el press de banca