Analysis of wearable and smartphone-based technologies for the measurement of Barbell velocity in different resistance training exercises
Entity
UAM. Departamento de Educación Física, Deporte y Motricidad HumanaPublisher
Frontiers MediaDate
2017Citation
10.3389/fphys.2017.00649
Frontiers in Physiology 8 (2017): article 649
ISSN
1664-042X (online)DOI
10.3389/fphys.2017.00649Editor's Version
http://doi.org/10.3389/fphys.2017.00649Subjects
monitoring; biomechanics; technology; strength; validation; educación física; EducaciónNote
This Document is Protected by copyright and was first published by Frontiers. All rights reserved. it is reproduced with permissionRights
Copyright © 2017 Balsalobre-Fernández, Marchante, Baz-Valle, Alonso-Molero, Jiménez and Muñoz-LópezAbstract
The purpose of this study was to analyze the validity, reliability, and accuracy of new
wearable and smartphone-based technology for the measurement of barbell velocity
in resistance training exercises. To do this, 10 highly trained powerlifters (age = 26.1
± 3.9 years) performed 11 repetitions with loads ranging 50–100% of the 1-Repetition
maximum in the bench-press, full-squat, and hip-thrust exercises while barbell velocity
was simultaneously measured using a linear transducer (LT), two Beast wearable
devices (one placed on the subjects’ wrist –BW–, and the other one directly attached
to the barbell –BB–) and the iOS PowerLift app. Results showed a high correlation
between the LT and BW (r = 0.94–0.98, SEE = 0.04–0.07 m•s−1
), BB (r = 0.97–0.98,
SEE = 0.04–0.05 m•s−1
), and the PowerLift app (r = 0.97–0.98, SEE = 0.03–0.05
m•s−1
) for the measurement of barbell velocity in the three exercises. Paired samples
T-test revealed systematic biases between the LT and BW, BB and the app in the
hip-thrust, between the LT and BW in the full-squat and between the LT and BB in
the bench-press exercise (p < 0.001). Moreover, the analysis of the linear regression
on the Bland-Altman plots showed that the differences between the LT and BW
(R
2 = 0.004–0.03), BB (R
2 = 0.007–0.01), and the app (R
2 = 0.001–0.03) were similar
across the whole range of velocities analyzed. Finally, the reliability of the BW (ICC
= 0.910–0.988), BB (ICC = 0.922–0.990), and the app (ICC = 0.928–0.989) for the
measurement of the two repetitions performed with each load were almost the same
than that observed with the LT (ICC = 0.937–0.990). Both the Beast wearable device
and the PowerLift app were highly valid, reliable, and accurate for the measurement of
barbell velocity in the bench-press, full-squat, and hip-thrust exercises. These results
could have potential practical applications for strength and conditioning coaches who
wish to measure barbell velocity during resistance training
Files in this item
Google Scholar:Balsalobre Fernández, Carlos
-
Marchante, David
-
Baz-Valle, Eneko
-
Alonso-Molero, Iván
-
Jiménez, Sergio L.
-
Muñóz-López, Mario
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