This video covers the accuracy (validity) and consistency (reliability) of some of the most commonly used smartwatches: Apple Watch, Garmin, and Fitbit. The features covered include regularly monitored fitness data: step count, heart rate, and energy expenditure (calories burned). I discuss not only which smartwatches are the most accurate at estimating each of these features, but also common research techniques used in testing.

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Timecodes:

0:00 - Intro

0:35 - Step count research techniques

1:02 - Step count accuracy and consistency

1:27 - Heart rate research techniques

1:53 - Heart rate accuracy and consistency

2:38 - Energy expenditure research techniques

3:34 - Energy expenditure accuracy and consistency

Sources used:

1. Fuller D, Colwell E, Low J, Orychock K, Tobin MA, Simango B, Buote R, Van Heerden D, Luan H, Cullen K, Slade L, Taylor NGA. Reliability and Validity of Commercially Available Wearable Devices for Measuring Steps, Energy Expenditure, and Heart Rate: Systematic Review. JMIR Mhealth Uhealth. 2020 Sep 8;8(9):e18694. doi: 10.2196/18694. PMID: 32897239; PMCID: PMC7509623.

2. Evenson KR, Spade CL. Review of Validity and Reliability of Garmin Activity Trackers. J Meas Phys Behav. 2020 Jun;3(2):170-185. doi: 10.1123/jmpb.2019-0035. PMID: 32601613; PMCID: PMC7323940.

3. Shin G, Jarrahi MH, Fei Y, Karami A, Gafinowitz N, Byun A, Lu X. Wearable activity trackers, accuracy, adoption, acceptance and health impact: A systematic literature review. J Biomed Inform. 2019 May;93:103153. doi: 10.1016/j.jbi.2019.103153. Epub 2019 Mar 23. PMID: 30910623.

5. Kenny GP, Notley SR, Gagnon D. Direct calorimetry: a brief historical review of its use in the study of human metabolism and thermoregulation. Eur J Appl Physiol. 2017 Sep;117(9):1765-1785. doi: 10.1007/s00421-017-3670-5. Epub 2017 Jul 8. PMID: 28689303.

6. https://support.garmin.com/en-GB/?faq...

Photos: 1. Actigraph. https://www.cdc.gov/nchs/data/nhanes/...

2. Apple watch. Photo by Anna Shvets: https://www.pexels.com/photo/person-w...

3. Garmin (CC). Jothishbabu, CC BY-SA 4.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

4. Polar. Boci, CC BY-SA 3.0 http://creativecommons.org/licenses/b..., via Wikimedia Commons

5. Apple logo (CC). apple, CC0, via Wikimedia Commons

Fitbit. Photo by Brett Sayles: https://www.pexels.com/photo/blue-fit...

6. Direct calorimetry. D. Gordon E. Robertson, CC BY-SA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

Videos: 1. smartwatch fitness data. Video by MART PRODUCTION: https://www.pexels.com/video/using-a-...

2. Smartwatch and phone. Video by Ketut Subiyanto: https://www.pexels.com/video/woman-co...

3. Treadmill. Video by Ruslan Khmelevsky: https://www.pexels.com/video/peron-ru...

4. EKG. Video by Los Muertos Crew: https://www.pexels.com/video/man-havi...

5. Apple watch. Video by Rob Cot: https://www.pexels.com/video/person-s...

6. Jump rope. Video by cottonbro studio: https://www.pexels.com/video/two-men-...

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