Health Library · Wearables
What your wearable really measures.
Health metrics and devices explained with sources — separating what sensors measure from what algorithms estimate, and what the numbers can and can't tell you.
LON6EVITY device sync — coming soon
LON6EVITY is built to bring wearable signals together with your lab results once device sync goes live. Planned integrations:
Apple Health · SoonAndroid Health Connect · SoonGarmin · SoonOura Ring · SoonWHOOP · SoonWithings · SoonFitbit / Google Health · SoonSamsung Health · Soon
Metrics ready to sync
StepsActive minutesResting heart rateHRVSleep durationSleep regularityVO₂ maxRecoveryTraining loadBody weightBody fatBlood pressureSpO₂
Devices
- Apple Watch: what it measures and its limitsA factual overview of Apple Watch health features: what the sensors measure, what is estimated, which models support ECG and Blood Oxygen, and the limitations.
- Garmin: health features and limitationsA factual overview of Garmin health features: optical heart rate, Pulse Ox, HRV status, Body Battery, VO2 max estimates and the ECG app on selected models.
- Oura Ring: what it measures and its limitsA factual overview of the Oura Ring: resting heart rate, HRV, respiratory rate, temperature trends and readiness — what is measured, what is estimated, and limitations.
Health metrics
- Blood oxygen (SpO2)Blood oxygen saturation shows how much oxygen your red blood cells carry. What normal values are, how watch and ring readings differ from medical pulse oximeters, and their limits.
- Daily stepsDaily step count is a simple measure of everyday movement. What the research says about steps and longevity and why there is no magic 10,000.
- Heart rate variability (HRV)HRV measures the variation in time between heartbeats. What it reflects, why values differ so much between people and devices, and how to use your own trend.
- Physical activity and active minutesHow much physical activity adults need per week, what counts as moderate and vigorous, and how wearables track active minutes.
- Recovery and readiness scoresRecovery and readiness scores combine signals like HRV, resting heart rate, sleep and temperature. How they work, why each brand differs, and how to use them sensibly.
- Respiratory rateRespiratory rate is the number of breaths per minute. Normal ranges, how wearables measure it during sleep, and why a sustained change can be worth noticing.
- Resting heart rateResting heart rate is one of the simplest and most useful wearable metrics. What a normal range is, what changes can mean, and how devices measure it.
- Sleep durationHow much sleep adults need, why regular short sleep affects health, and how accurately wearables measure total sleep time.
- Sleep efficiency and sleep stagesSleep efficiency is the share of time in bed spent asleep. What it means, how wearables estimate sleep stages, and why stage data should be read with caution.
- VO2 max (cardiorespiratory fitness)VO2 max measures cardiorespiratory fitness, one of the strongest predictors of long-term health. How it is measured in a lab, how wearables estimate it, and how to improve it.
About LON6EVITY. A longevity and prevention platform that keeps your biomarkers, screenings and health history in one place, shows trends over time and prepares doctor-ready reports. How it works
Bring your health data together
What does this mean for your own health data? Log your results, follow trends over time and bring an organised summary to your next doctor's appointment.