![Sensors | Free Full-Text | Validation of the Apple Watch for Heart Rate Variability Measurements during Relax and Mental Stress in Healthy Subjects Sensors | Free Full-Text | Validation of the Apple Watch for Heart Rate Variability Measurements during Relax and Mental Stress in Healthy Subjects](https://www.mdpi.com/sensors/sensors-18-02619/article_deploy/html/images/sensors-18-02619-g001.png)
Sensors | Free Full-Text | Validation of the Apple Watch for Heart Rate Variability Measurements during Relax and Mental Stress in Healthy Subjects
![Heart Rate Variability from Apple Watch 4 vs. a Nexus 10 Biofeedback unit. Quite similar! : r/AppleWatch Heart Rate Variability from Apple Watch 4 vs. a Nexus 10 Biofeedback unit. Quite similar! : r/AppleWatch](https://i.redd.it/az68eo39xcr11.jpg)
Heart Rate Variability from Apple Watch 4 vs. a Nexus 10 Biofeedback unit. Quite similar! : r/AppleWatch
![What's your heart rate variability? I have no idea what HRV is or what it should be, so i'm just asking around what's your average HRV? My average is 30ms-50ms but it What's your heart rate variability? I have no idea what HRV is or what it should be, so i'm just asking around what's your average HRV? My average is 30ms-50ms but it](https://preview.redd.it/2zontz1supu51.jpg?auto=webp&s=714dfac6ea86a25ad0b69ace7e119558fafc3756)