Insights on health technology, privacy-first design, and the science behind smarter wearables.
Tattoo ink sits right where your smart ring's PPG light needs to go. The physics of why Oura, Whoop, and every other wearable struggles with inked skin, and what it means for the next generation of optical sensors.
Beta-blockers suppress HRV by 30 to 50 percent. SSRIs alter sleep architecture. Antihistamines fragment deep sleep. If you take medication and your smart ring gives you bad scores, the problem might not be your body.
Most wearable algorithms are trained on datasets that are 70 to 80 percent male. Heart rate thresholds, sleep stage classifiers, and stress baselines are systematically less accurate for women. Here is why, and what Pulsyn is doing about it.
Your smart ring's PPG sensor produces clean heart rate data roughly 40 percent of the time. The other 60 percent is a signal that has been through an adaptive filter, and what comes out is a reconstruction. Here is what actually happens inside the chip when you wave your hand.
Caffeine changes your biometrics in ways that look like recovery to a wearable. Higher HRV, elevated resting heart rate, and altered sleep architecture produce a readiness score that says you are rested while your body metabolizes a stimulant. Here is how the blind spot works and what wearables could do about it.
Alcohol breaks your wearable's data in three compounding ways. HRV goes up (which looks like recovery but is the opposite), deep sleep increases from delta wave activity (low quality), and PPG signal quality degrades from dehydration. Your readiness score may look fine while your body is metabolizing a toxin.
John Hancock, UnitedHealthcare, and Aetna all offer premium discounts for sharing wearable data. The fine print lets them use that same data to raise your rates. Here is how the system works and what you can do about it.
A growing body of research shows that wearables and wellness apps can increase stress and trigger obsessive behaviors. Here is what health tracking anxiety looks like, why the industry does not talk about it, and what Pulsyn does differently.
Your smart ring's PPG sensor stops working properly when your fingers get cold. Vasoconstriction reduces blood flow to your extremities, and the data quality drops by 50 percent or more. I spent a winter measuring exactly how much, and the numbers are worse than the industry admits.
