Peter Attia· MD
the use of these PPG or Optical sensors really has only been the last you know five six years they they've been around and traditionally their accuracy was just questionable when it came to it
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
the use of these PPG or Optical sensors really has only been the last you know five six years they they've been around and traditionally their accuracy was just questionable when it came to it
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they don't get the same electrical signal they're measuring changes in blood volume through the skin basically electrod shine electric or shine the LED light down into the skin it reflects differently based on the blood flow flowing through the the arteries below it and so you're getting the pulse and they actually call it pulse rate variability it's not really heart rate variability if we want to get technical it's pulse rate variability but it's showing us the same thing it's showing us that cardiac cycle