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Assessing the Accuracy of Fitness Smartwatch Data for Cardiovascular and Physical Activity Monitoring: A Validation Study in Digital Health

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Measuring Moderate-Intensity Exercise with the Apple Watch: Validation Study.

Grant Abt¹, James Bray¹, Amanda Clare Benson²

¹School of Life Sciences, The University of Hull, Kingston upon Hull, United Kingdom.

|November 24, 2019

Summary

This summary is machine-generated.

The Apple Watch underestimates moderate-intensity exercise, potentially overcounting daily activity minutes. This impacts accurate exercise tracking for health professionals and personalized medicine.

Keywords:

cardiovascular health, Apple Watch physical activity smartwatch technology wearables

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Area of Science:

Exercise physiology
Wearable technology validation
Cardiovascular health research

Background:

Habitual exercise and moderate fitness levels protect against chronic diseases and mortality.
Consumer wearable devices like the Apple Watch track exercise, but their accuracy for moderate-intensity is unproven.
Accurate wearable data is crucial for personalized medicine and disease management.

Purpose of the Study:

To validate the Apple Watch's exercise ring for measuring moderate-intensity exercise.
To compare Apple Watch data against a criterion of 40-59% oxygen consumption reserve (VO2R).

Main Methods:

Twenty participants underwent VO2rest and VO2max testing.
Participants walked on a treadmill, wearing an Apple Watch on each wrist, with continuous oxygen consumption monitoring.
The treadmill speed was incrementally increased until the Apple Watch registered 5 minutes of exercise.

Main Results:

The Apple Watch's exercise threshold corresponded to 30% VO2R, significantly lower than the 40% VO2R criterion.
A substantial underestimation of moderate-intensity exercise was observed (mean difference of -10% VO2R).
Reliability analyses showed small to moderate typical errors and high intraclass correlations within trials.

Conclusions:

The Apple Watch's threshold for moderate-intensity exercise is set too low.
This inaccuracy leads to an overestimation of daily moderate-intensity exercise minutes recorded by the device.
Further validation is needed for reliable use in clinical settings and personalized medicine.