Garmin CIRQA Ultimate Scientific Review!
In a Nutshell
Garmin Circa delivers excellent biceps heart rate tracking (0.98-1.00 correlation across cardio) versus poor wrist performance during running (0.89) and strength training (0.73). Sleep staging shows similar location dependency—biceps placement achieves 91% deep sleep and 58% REM accuracy versus wrist's 81% and 45%, respectively. The device is recommended for biceps wear during exercise with wrist-only use at night when sleep stages aren't critical, though official biceps bands cost ~$60 and have limited availability.
These notes were generated by AI and may contain inaccuracies.
Systematic and scientific testing was performed on the Garmin Circa to evaluate heart rate tracking during exercise, nighttime measurements, and sleep stage tracking. Testing occurred both on the wrist and on the biceps, with the distinction between wear locations being important for performance and recommendations. The tester is a post-doctoral scientist specializing in biological data analysis.
The Garmin Circa was tested using official bands with settings according to specifications. All data presentations show wrist results first, followed by biceps results. Two colors were purchased, with one received from Garmin. The blue and black colors match the box appearance, but the reddish color appears significantly different - more of a faded pink than the dark red shown on the box.
Testing methodology involves comparing devices against the Polar H10 ECG chest strap as the reference device. The reference appears along the horizontal axis in plots, with Circa results along the vertical axis. Wrist-based testing appears on the left, biceps-based testing on the right.
Indoor cycling (spinning) showed excellent performance for both wear locations. Wrist testing achieved a correlation of 0.99, while biceps testing achieved a rounded correlation of 1.00. Example sessions showed good agreement on the wrist with minor deviations at the beginning, while biceps examples showed essentially no deviation and almost perfect tracking.
Sign in to read the full notes
Get access to AI-generated notes, topic timestamps, and more.