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Stones unturned download12/27/2023 Accordingly, it registers the time lapsed between each beat and creates a graph. PPG – Welltory uses the phone’s flash to illuminate your finger and measure the changes in light absorption and blood volume. So, Welltory employs PPG (Photoplethysmography) and ECG (Electrocardiogram) to measure heartbeat intervals down to milliseconds. Now, measuring HRV is not as easy as measuring your current heartbeat or blood oxygen level. You can read about it in detail on the app’s website. The whole idea is based on science and decades of research and used by astronauts, health officials, and athletes to study and maintain their bodies’ reactions to certain situations. This, in turn, allows you to analyze the body’s systems, physiological stress levels, risk of getting sick, and much more. Measured in milliseconds, the variance can help access the state of the autonomic nervous system (ANS).
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