#HeartRateMonitor

Adrian Segar

@segar.com

1 week ago

fix Apple Watch heart rate monitor: comparison of two typical old and new Apple Watch heart rate charts

Here is a comprehensive list of what to check when you need to fix an Apple Watch heart rate monitor that's not working.

www.conferencesthatwork.com/index.php/te...

#Apple #Watch #AppleWatch #HeartRateMonitor #workout #problems #HowToFix

CycleTechReview

@cycletechreview.bsky.social

2 weeks ago

Viiiiva Heart Rate Monitor - 4iiii Launches New Viiiiva Heart Rate Monitor With Class‑Leading Battery Life and Comfort 4iiii has introduced the latest generation of its Viiiiva Heart Rate Monitor, delivering...

The Viiiiva Heart Rate Monitor from 4iiii has been updated and now boasts 540+ hour battery life.

The Viiiiva is positioned as the “ultimate power couple” when paired with 4iiii’s PRECISION 3+ power meters

#4iiii #viiiivahrm #heartratemonitor

cycletechreview.com/2026/news/vi...

the5krunner

@the5krunner.bsky.social

2 weeks ago

4iiii Viiiiva 2.0 Heart Rate Monitor: Buyers Guide 4iiii has relaunched its long-running Viiiiva chest strap as the Viiiiva 2.0, with a 540-hour battery life and a simplified feature set. We cover specs, competitor pricing, and what was quietly droppe...

4iiii just relaunched the Viiiiva as a v2.0. 540-hour battery, stripped-back feature set. One competitor beats it on battery by a wide margin — and costs less. the5krunner.com/2026/02/26/4... #cycling #HeartRateMonitor #4iiii #ANTplus

JMIR Publications

@jmirpub.bsky.social

3 weeks ago

Accuracy of Optical Heart Rate Measurements for 10 Commercial Wearables in Different Climate Conditions and Activities: Instrument Validation Study Background: Commercial wearable devices allow for continuous heart rate (HR) monitoring in daily life. Their accuracy under ecologically valid conditions, however, remains insufficiently independently tested, especially during irregular activity, cognitive stress, and variable climates. Objective: The present study evaluated the HR accuracy of ten commercially available wearables under controlled variations in physical activity, cognitive stress, and temperature. We hypothesized that physical activity irregularity, cognitive stress, and thermal climate conditions would affect measurement accuracy. Methods: Forty-five healthy adults (21–68 years, mean ± SD: 34 ± 12) completed a standardized protocol in climate-controlled chambers simulating neutral (23°C), hot (36°C), and cold (10°C) conditions. Tasks included rest, cognitive stress (Montreal Imaging Stress Task), steady walking, and intermittent walking. Each of ten devices (Fitbit Charge 6, Fitbit Inspire 3, Garmin Vivosmart 5, Garmin Vivoactive 5, Apple Watch SE, Google Pixel Watch 2, Polar Ignite 3, Polar Pacer, Xiaomi Watch 2, Oura Ring Gen 3) was compared against ECG-derived HR from a Zephyr BioHarness chest strap. Accuracy was assessed using mean absolute error (MAE), mean absolute percentage error (MAPE), repeated-measures concordance correlation coefficient (CCC), and Bland–Altman analysis. Results: Significant variability across devices was observed. Fitbit Charge 6 (MAE 4.5 bpm, MAPE 5.5%, CCC 0.93) and Google Pixel Watch 2 (MAE 4.9 bpm, MAPE 6.7%, CCC 0.87) showed strong agreement with the gold standard. In contrast, Fitbit Inspire 3, Polar Ignite 3, Polar Pacer, and Oura Ring displayed larger errors (MAE 9–14 bpm, MAPE 11–16%) and lower CCC values (0.45–0.66). The climate conditions did not significantly affect the measurement accuracy of the test devices. The activity type, however, did have a significant effect: intermittent walking increased errors for multiple devices. Conclusions: Wearable HR measurement accuracy is device-specific and context-dependent. Moderate climates did not impair performance, but irregular movement reduced accuracy. Fitbit Charge 6 and Google Pixel Watch 2 demonstrated highest reliability, supporting their use in health and sports monitoring. Careful device selection and context-aware interpretation remain critical for applied and clinical applications.

JMIR Formative Res: Accuracy of Optical Heart Rate Measurements for 10 Commercial Wearables in Different Climate Conditions and Activities: Instrument Validation Study #WearableTech #HeartRateMonitor #FitnessTracking #HealthTech #ClimaticConditions