The Flow
The Flow
The Flow
The Flow — 2026-08-13
The Flow
The Flow — 2026-08-06
The Flow
The Flow — 2026-08-01
Free Flow · Wearables Meet Their Reference · Saturday The Week in One Number 0.98. That's the concordance correlation coefficient (CCC) for Oura Gen 4's nocturnal resting heart rate against an ECG reference — mean absolute percentage error just 1.94%. Dial and colleagues (Physiological Reports, August 2025)
The Flow
The Flow — 2026-07-30
The Flow
The Flow — 2026-07-26
The Flow · Trusting Your Overnight HRV Number · 2026-07-26 This week's Deep Read: what a five-device validation study says about whether your wearable's HRV number is worth acting on. Opening Flow A validation study puts a hard number on a soft assumption. Dial and colleagues compared five