Garmin CIRQA Early Test Results: Strong Heart-Rate Tracking for Running and Cycling, Mixed Sleep Accuracy
Garmin’s new CIRQA smart band has only been on the market for around ten days, but early testing is already giving fitness fans a clearer idea of what to expect. For anyone considering the wearable for health tracking, workout monitoring, or sleep analysis, preliminary findings from wearables researcher Rob ter Horst offer useful insight.
Ter Horst, also known online as The Quantified Scientist, is a Dutch researcher and content creator with a background in biological data analysis. His wearable reviews are known for their structured, data-focused approach, often comparing smartwatches and fitness bands against more specialized reference devices across workouts and sleep sessions.
In his early Garmin CIRQA evaluation, he focused mainly on heart-rate accuracy and sleep tracking. To measure performance, he compared the smart band’s readings with data from a Polar H10 ECG chest strap for exercise and an EEG-based system for sleep monitoring.
The early results suggest that Garmin CIRQA performs well in several fitness scenarios, especially cycling and steady running. During indoor cycling sessions, the band’s heart-rate measurements were closely aligned with the chest strap reference. Outdoor cycling also showed strong accuracy, although the CIRQA occasionally recorded slightly lower readings than the reference device.
Running results were also promising. During steady-paced runs, the CIRQA delivered accurate heart-rate data and appeared reliable for users who mainly do consistent cardio workouts. However, the device showed some weaknesses during interval training, where fast changes in pace and heart rate made tracking less precise at times. This is not unusual for wrist-based optical sensors, which can struggle when heart rate changes quickly.
Weightlifting remains a more difficult area. According to ter Horst, wrist tension during strength training can interfere with optical heart-rate sensors, making readings less reliable. Because of this, he did not include a dedicated weightlifting test in the initial round. He plans to continue testing with bicep-worn heart-rate straps, which often provide better accuracy during exercises that involve wrist movement or gripping. He has ordered several different bands for future comparisons, though those tests may take a few weeks to complete.
Sleep tracking delivered more mixed results. Deep sleep detection appears to be one of the CIRQA’s stronger features, with a reported 76.5% overlap compared with the reference sleep monitoring system. Light sleep tracking was described as average, while REM sleep detection was less consistent.
Across several nights, the CIRQA often missed REM sleep during the first half of the night, though it became more accurate later in the sleep cycle. Ter Horst noted that the amount of sleep data collected so far is still limited, so future testing could change the overall picture. At this stage, Garmin CIRQA’s sleep tracking appears solid, but it may not yet rank among Garmin’s strongest sleep-monitoring implementations.
Overall, the early Garmin CIRQA test results are encouraging for users focused on cardio workouts. The smart band seems particularly dependable for cycling and steady-paced running, making it a potentially strong option for fitness tracking in those areas. However, users who rely heavily on interval training, weightlifting, or detailed REM sleep analysis may want to wait for more complete long-term testing before making a final decision.
For now, Garmin CIRQA looks like a capable fitness band with accurate heart-rate tracking in the right conditions, but its sleep analysis and strength-training performance still need further evaluation.
