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Validity and reliability of a novel iPhone app for the measurement of barbell velocity and 1RM on the bench-press exercise.
J Sports Sci. 2018 Jan; 36(1):64-70.JS

Abstract

The purpose of this study was to analyse the validity and reliability of a novel iPhone app (named: PowerLift) for the measurement of mean velocity on the bench-press exercise. Additionally, the accuracy of the estimation of the 1-Repetition maximum (1RM) using the load-velocity relationship was tested. To do this, 10 powerlifters (Mean (SD): age = 26.5 ± 6.5 years; bench press 1RM · kg-1 = 1.34 ± 0.25) completed an incremental test on the bench-press exercise with 5 different loads (75-100% 1RM), while the mean velocity of the barbell was registered using a linear transducer (LT) and Powerlift. Results showed a very high correlation between the LT and the app (r = 0.94, SEE = 0.028 m · s-1) for the measurement of mean velocity. Bland-Altman plots (R2 = 0.011) and intraclass correlation coefficient (ICC = 0.965) revealed a very high agreement between both devices. A systematic bias by which the app registered slightly higher values than the LT (P < 0.05; mean difference (SD) between instruments = 0.008 ± 0.03 m · s-1). Finally, actual and estimated 1RM using the app were highly correlated (r = 0.98, mean difference (SD) = 5.5 ± 9.6 kg, P < 0.05). The app was found to be highly valid and reliable in comparison with a LT. These findings could have valuable practical applications for strength and conditioning coaches who wish to measure barbell velocity in the bench-press exercise.

Authors+Show Affiliations

a Department of Sport Sciences , Universidad Europea de Madrid , Madrid , Spain.b Department of Research & Development , Powerexplosive Center , Madrid , Spain.b Department of Research & Development , Powerexplosive Center , Madrid , Spain.a Department of Sport Sciences , Universidad Europea de Madrid , Madrid , Spain.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28097928

Citation

Balsalobre-Fernández, Carlos, et al. "Validity and Reliability of a Novel iPhone App for the Measurement of Barbell Velocity and 1RM On the Bench-press Exercise." Journal of Sports Sciences, vol. 36, no. 1, 2018, pp. 64-70.
Balsalobre-Fernández C, Marchante D, Muñoz-López M, et al. Validity and reliability of a novel iPhone app for the measurement of barbell velocity and 1RM on the bench-press exercise. J Sports Sci. 2018;36(1):64-70.
Balsalobre-Fernández, C., Marchante, D., Muñoz-López, M., & Jiménez, S. L. (2018). Validity and reliability of a novel iPhone app for the measurement of barbell velocity and 1RM on the bench-press exercise. Journal of Sports Sciences, 36(1), 64-70. https://doi.org/10.1080/02640414.2017.1280610
Balsalobre-Fernández C, et al. Validity and Reliability of a Novel iPhone App for the Measurement of Barbell Velocity and 1RM On the Bench-press Exercise. J Sports Sci. 2018;36(1):64-70. PubMed PMID: 28097928.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Validity and reliability of a novel iPhone app for the measurement of barbell velocity and 1RM on the bench-press exercise. AU - Balsalobre-Fernández,Carlos, AU - Marchante,David, AU - Muñoz-López,Mario, AU - Jiménez,Sergio L, Y1 - 2017/01/18/ PY - 2017/1/18/pubmed PY - 2018/2/21/medline PY - 2017/1/19/entrez KW - Biomechanics KW - performance KW - resistance training KW - smartphone SP - 64 EP - 70 JF - Journal of sports sciences JO - J Sports Sci VL - 36 IS - 1 N2 - The purpose of this study was to analyse the validity and reliability of a novel iPhone app (named: PowerLift) for the measurement of mean velocity on the bench-press exercise. Additionally, the accuracy of the estimation of the 1-Repetition maximum (1RM) using the load-velocity relationship was tested. To do this, 10 powerlifters (Mean (SD): age = 26.5 ± 6.5 years; bench press 1RM · kg-1 = 1.34 ± 0.25) completed an incremental test on the bench-press exercise with 5 different loads (75-100% 1RM), while the mean velocity of the barbell was registered using a linear transducer (LT) and Powerlift. Results showed a very high correlation between the LT and the app (r = 0.94, SEE = 0.028 m · s-1) for the measurement of mean velocity. Bland-Altman plots (R2 = 0.011) and intraclass correlation coefficient (ICC = 0.965) revealed a very high agreement between both devices. A systematic bias by which the app registered slightly higher values than the LT (P < 0.05; mean difference (SD) between instruments = 0.008 ± 0.03 m · s-1). Finally, actual and estimated 1RM using the app were highly correlated (r = 0.98, mean difference (SD) = 5.5 ± 9.6 kg, P < 0.05). The app was found to be highly valid and reliable in comparison with a LT. These findings could have valuable practical applications for strength and conditioning coaches who wish to measure barbell velocity in the bench-press exercise. SN - 1466-447X UR - https://www.unboundmedicine.com/medline/citation/28097928/Validity_and_reliability_of_a_novel_iPhone_app_for_the_measurement_of_barbell_velocity_and_1RM_on_the_bench_press_exercise_ L2 - https://www.tandfonline.com/doi/full/10.1080/02640414.2017.1280610 DB - PRIME DP - Unbound Medicine ER -