Topic
Wearables
Apple Health, Fitbit, Oura, CGM, and getting signal out of devices.
Atlas MercerCan You Trust Your Oura or Whoop Readiness Score?
When five wearables were tested against a clinical ECG across 536 nights, the raw nocturnal heart rate and HRV signals proved accurate to within a few percent, accurate enough to build a protocol on.
Max KlineHow Accurate Is Your Smartwatch at Telling Deep Sleep From REM?
Consumer sleep trackers nail asleep-versus-awake but are far shakier at splitting deep, light, and REM sleep, with one validation study finding the Apple Watch off on deep sleep by 43 minutes.
Atlas MercerDo Continuous Glucose Monitors Overestimate Your Blood Sugar Spikes?
A University of Bath crossover trial found a FreeStyle Libre 2 rated a smoothie medium-to-high GI while a finger-prick test rated it low, and the sensor overestimated time above range severalfold.
Max KlineBlind Your Wearables to Beat the Recovery Nocebo Effect
You wake up feeling rested, pour your morning coffee, and sync your wearable. The screen flashes red: your heart rate variability tanked, your deep sleep was minimal, and your recovery score is a disastrous thirty per…
