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The higher your body fat percentage, the less accurate your smartwatch is at measuring calories burned

Study participants rode a recumbent bike while wearing four smartwatches and breathing into a metabolic analyzer.

Portrait of Naomi Reyes
Wellness & Fitness · September 26, 2026
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AI-generated rendition with an imagined camera angle, not a documentary photograph. Source: medicalxpress.com
AI-generated rendition with an imagined camera angle, not a documentary photograph. Source image: medicalxpress.com.

Study participants rode a recumbent bike while wearing four smartwatches and breathing into a metabolic analyzer. Credit: Taimy Alvarez/Florida International University Smartwatches have become an increasingly popular way for people to monitor their health and fitness.

About 100 million—nearly 4 in 10—U.S. adults own a smartwatch.

First reported by Medical Xpress.

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