Validity of sports watches when estimating energy expenditure during running

Lilian Roos; Wolfgang Taube; Nadja Beeler; Thomas Wyss

doi:10.1186/s13102-017-0089-6

Validity of sports watches when estimating energy expenditure during running

BMC Sports Sci Med Rehabil. 2017 Dec 20:9:22. doi: 10.1186/s13102-017-0089-6. eCollection 2017.

Authors

Lilian Roos^{1

2}, Wolfgang Taube², Nadja Beeler¹, Thomas Wyss¹

Affiliations

¹ Section for Elite Sport, Swiss Federal Institute of Sport Magglingen SFISM, Hauptstrasse 247, 2532 Magglingen, Switzerland.
² Department of Medicine, Movement and Sport Science, University of Fribourg, Boulevard de Pérolles 90, 1700 Fribourg, Switzerland.

Abstract

Background: The aim of this study was to assess the accuracy of three different sport watches in estimating energy expenditure during aerobic and anaerobic running.

Methods: Twenty trained subjects ran at different intensities while wearing three commercial sport watches (Suunto Ambit2, Garmin Forerunner920XT, and Polar V800). Indirect calorimetry was used as the criterion measure for assessing energy expenditure. Different formulas were applied to compute energy expenditure from the gas exchange values for aerobic and anaerobic running.

Results: The accuracy of the energy expenditure estimations was intensity-dependent for all tested watches. During aerobic running (4-11 km/h), mean absolute percentage error values of -25.16% to +38.09% were observed, with the Polar V800 performing most accurately (stage 1: -12.20%, stage 2: -3.61%, and stage 3: -4.29%). The Garmin Forerunner920XT significantly underestimated energy expenditure during the slowest stage (stage 1: -25.16%), whereas, the Suunto Ambit2 significantly overestimated energy expenditure during the two slowest stages (stage 1: 38.09%, stage 2: 36.29%). During anaerobic running (14-17 km/h), all three watches significantly underestimated energy expenditure by -21.62% to -49.30%. Therefore, the error in estimating energy expenditure systematically increased as the anaerobic running speed increased.

Conclusions: To estimate energy expenditure during aerobic running, the Polar V800 is recommended. By contrast, the other two watches either significantly overestimated or underestimated energy expenditure during most running intensities. The energy expenditure estimations generated during anaerobic exercises revealed large measurement errors in all tested sport watches. Therefore, the algorithms for estimating energy expenditure during intense activities must be improved before they can be used to monitor energy expenditure during high-intensity physical activities.

Keywords: High-intensity; Maximal accumulated oxygen deficit; Monitoring training; Validation; Wearables.