@nataliezzz3@tessfalor You have to quantify the pulse wave amplitude dip depth and length. This is what I am developing currently with Vagis ring. The data is astounding.
This is next level from Vagis ring. Sleep recording. Top graph is Vagis Autonomic Variability Index, bottom is Oxyring SpO2. 4 REM stages on both. At 2200 and 0300 Vagis captures variability Oxyring SpO2 cannot detect. Most likely Respiratory Effort-Related Arousal (UARS).
@GenevieveIguess Good question and I doubt anybody knows the answer at this point. But I am building the only technology that will be able to figure it out. Vagis ring.
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@DavidJoffe64 I’ve built a smart ring that can detect REM behaviour disorder. My sleep from last night, I can qualify and quantify motion during REM stage, see last REM stage.
Working on a new analysis type, recording HR and accelerometer data all day/night using Vagis ring. Associating these two metrics in a long term basis yields interesting metrics regarding energy expenditure and reserves.