Garmin Forerunner 955 Heart Tracking Accuracy Evaluated
The smartwatch reliably tracks heart rate while resting, but its variability data may not offer absolute clinical precision.
Updated on Oct. 20, 2026 in Heart Disease
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A recent study comparing the Garmin Forerunner 955 to electrocardiogram readings found the device tracks heart rate reliably while sedentary. However, the data suggests the watch's heart rate variability measurements lack absolute accuracy for users seeking clinical-grade insights.
Why it matters
For individuals monitoring their heart health through wearable technology, this study clarifies the limits of device-based metrics. It highlights that while heart rate tracking may be dependable for everyday use, more sensitive metrics like heart rate variability may not yet match medical-grade equipment.
This study published in the journal Sensors compared the Garmin Forerunner 955's heart rate and variability data against an electrocardiogram in 23 participants. While findings suggest highly reliable heart rate readings, the watch lacked absolute accuracy for heart rate variability data.
The players
Garmin
A technology company that designs consumer and professional wearable devices, including fitness-focused smartwatches.
Sensors
A peer-reviewed, open-access journal that publishes research on the development and application of sensor technologies.
The details
The Garmin Forerunner 955 uses Elevate v4 sensor hardware to detect heart activity. Researchers tested these sensors while participants were in stationary positions—specifically lying down or standing up—to see how well the device matched electrical heart signals captured by an electrocardiogram. While the watch performed well for tracking simple pulse rates during these sedentary states, its heart rate variability tracking showed discrepancies compared to the clinical standard.
Timeline
The Garmin Forerunner 955 was initially announced in 2022.
The study findings were published in the journal Sensors in October 2026.
Health Landscape
This research evaluates the Garmin Forerunner 955 Elevate v4 sensor against medical-grade diagnostic standards. It underscores the ongoing gap between consumer-grade wellness trackers and the clinical precision required for medical health management.
If you rely on your wearable device for heart rate data, understand that it may be accurate for casual tracking but not for clinical diagnosis. It is worth discussing any health concerns or heart rate irregularities detected by your device with your doctor rather than relying on watch data alone.
The takeaway
While consumer wearables offer useful general insights, they are currently limited in their clinical-grade accuracy for complex metrics like heart rate variability. If you notice unusual data or persistent heart rate patterns, always consult with your physician to verify these results.
Further reading
Learn more about the latest developments in cardiac monitoring technology in our Heart Disease section.
Source note: This article includes information reported by Forbes.
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