Apple Watch Ultra 4 & Series 12: BETTER HR, Steps & ECG! (All You Need To Know)

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Reference devices:
ZMax + Dreamento: biorxiv.org/content/10.1101/2023.08.18.553744v1 & github.com/dreamento/dreamento
Polar H10: pubmed.ncbi.nlm.nih.gov/31004219
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Timestamps:
00:00 Intro: The Biggest Apple Watch Health Upgrade
00:40 Redesigned Heart Rate Sensors
01:43 Higher Frequency Data Collection
02:48 Heart Rate Accuracy & Difficult Workouts
03:53 New Step Counting Algorithm
04:25 Heart Rate Variability (HRV) Updates
05:36 Apple's New Readiness Score
06:42 Redesigned Health App & Longevity Tab
08:14 At-Home Movement Evaluations
09:45 Battery Life & Extended Workout Modes
11:05 Audio Intelligence Features
11:41 Summary & Upcoming Tests