You could look at https://www.hrv4training.com/ to measure your heart rate variability. I believe it uses your phone camera and is scientifically validated. Should be more affordable.
This would be great if it works. Could you say more about why you think it does? The website says it measures at the finger, and my understanding is the signal is fuzzy by that point.
You could look at https://www.hrv4training.com/ to measure your heart rate variability. I believe it uses your phone camera and is scientifically validated. Should be more affordable.
This would be great if it works. Could you say more about why you think it does? The website says it measures at the finger, and my understanding is the signal is fuzzy by that point.
I’m not really an expert on HRV, I just trusted the validation study here:
https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods