Understand your body — through data
An education hub on your resourceful state, recovery, and longevity. Come for the knowledge — leave with a clear action plan.
Where to start
Pick a topic — inside you'll find clear material with sources and a link to WITU metrics.
What to measure with what
Every health goal relies on its own metrics and device. That's how the Data Confidence Index (DCI) grows.
| Topic | Device | Key metrics | Contribution to DCI |
|---|---|---|---|
| Heart and HRV | Bracelet, Patch | RMSSD, SDNN, resting HR | +25% |
| Sleep | Ring, Bracelet | Sleep stages, SpO₂ | +20% |
| Stress | Bracelet, Ring | LF/HF, stress index | +15% |
| Sport | Chest strap, Bracelet | VO₂max, Recovery | +15% |
| Longevity | Bracelet, Ring | Bio-age, trends | +10% |
| Nutrition | App | Ferritin, vitamin D, TSH | +10% |
Questions about health
How do I check my heart health at home?
Regularly track your resting heart rate and heart rate variability (HRV). A steady rise in resting heart rate and a drop in HRV are reasons to ease off. The WITU bracelet reads your pulse wave (PPG), HRV and SpO₂ with medical-grade optical sensors — and for a full ECG you can add the patch or chest strap. Either way, it's not a substitute for a doctor.
Which device should I choose for my goal?
Sleep and background tracking — the ring. All-day optical tracking — the bracelet. Continuous ECG and clinical monitoring — the patch. Sport, ECG and VO₂max — the chest strap. You can start for free with the app and any watch.
Can I improve my HRV?
Yes: quality sleep, stress management, aerobic exercise, and closing deficiencies (iron, vitamin D) usually raise HRV. It's important to look at your personal trend over 7–14 days, not a single day.
References
This hub's material rests on peer-reviewed research. Key sources:
- Task Force of ESC and NASPE. Heart rate variability: standards of measurement, physiological interpretation, and clinical use. Circulation, 1996.
- Kim H.-G. et al. Stress and heart rate variability: a meta-analysis. Psychiatry Investigation, 2018.
- Plews D.J. et al. Training adaptation and heart rate variability in elite endurance athletes. 2013.
- WHO. Serum ferritin concentrations for the assessment of iron status. 2020.
- Holick M.F. Vitamin D deficiency. New England Journal of Medicine, 2007.
Health is data + action
Start measuring for free in the app. Want medical-grade accuracy — build your optical bracelet.
Insights are provided for general wellness and informational purposes only and are not intended to diagnose, treat, or replace professional medical advice. If you have any health concerns, consult a qualified healthcare provider.