Validation of a smartwatch-based workout analysis application in exercise recognition, repetition count and prediction of 1RM in the strength training-specific setting

Oberhofer, Katja; Erni, Raphael; Sayers, Mark; Huber, Dominik; Lüthy, Fabian; Lorenzetti, Silvio (2021). Validation of a smartwatch-based workout analysis application in exercise recognition, repetition count and prediction of 1RM in the strength training-specific setting Sports, 9(9), pp. 1-11. MDPI 10.3390/sports9090118

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The goal of this study was to assess the validity, reliability and accuracy of a smartwatch-based workout analysis application in exercise recognition, repetition count and One Repetition Maximum (1RM) prediction in the strength training-specific setting. Thirty recreationally trained athletes performed four consecutive sets of barbell deadlift, barbell bench press and barbell back squat exercises with increasing loads from 60% to 80% of their estimated 1RM with maximum lift velocity. Data was measured using an Apple Watch Sport and instantaneously analyzed using an iOS workout analysis application called StrengthControl. The accuracies in exercise recognition and repetition count, as well as the reliability in predicting 1RM, were statistically analyzed and compared. The correct strength exercise was recognised in 88.4% of all the performed sets (N = 363) with accurate repetition count for the barbell back squat (p = 0.68) and the barbell deadlift (p = 0.09); however, repetition count for the barbell bench press was poor (p = 0.01). Only 8.9% of attempts to predict 1RM using the StrengthControl app were successful, with failed attempts being due to technical difficulties and time lag in data transfer. Using data from a linear position transducer instead, significantly different 1RM estimates were obtained when analysing repetition to failure versus load-velocity relationships. The present results provide new perspectives on the applicability of smartwatch-based strength training monitoring to improve athlete performance.

Item Type:

Journal Article (Original Article)

Division/Institute:

Swiss Federal Institute of Sports Magglingen SFISM > EHSM - Leistungssport

Name:

Oberhofer, Katja;
Erni, Raphael;
Sayers, Mark;
Huber, Dominik;
Lüthy, Fabian and
Lorenzetti, Silvio0000-0002-8339-8960

ISSN:

2075-4663

Publisher:

MDPI

Language:

English

Submitter:

Admin import user

Date Deposited:

23 May 2022 14:26

Last Modified:

23 May 2022 14:26

Publisher DOI:

10.3390/sports9090118

PubMed ID:

34564323

Uncontrolled Keywords:

Resistance training Muscle strength Physical conditioning Smartphone Wearable electronic devices Biomechanics

ARBOR DOI:

10.24451/arbor.16841

URI:

https://arbor.bfh.ch/id/eprint/16841

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