Category: Fitbit
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Beyond the Pulse: What Fitbit’s ECG Sensor Actually Reads — and What It Can’t
Fitbit’s ECG sensor records the electrical signal of your heartbeat — not just blood flow. Here’s how the ECG app detects AFib with 98.7% accuracy, which models carry it, and what the electrical trace reveals about your autonomic nervous system.
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Inside the Number: How Wearables Actually Calculate Your Stress Score
Every wearable stress score starts with HRV — but Oura, Whoop, Garmin, Fitbit, and Apple Watch each calculate it differently. Here’s exactly what methodology sits behind the number on your device each morning.
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Fitbit and Your Nervous System: What It Does Well, and Where It Falls Short
The Fitbit wearable nervous system tracking story begins with the right framing. Fitbit does not position itself as a clinical instrument — it positions itself as the most accessible entry point into biometric self-awareness. Where the Fitbit nervous system data holds up Sleep and wake detection is Fitbit’s strongest suit. Modern Fitbit devices combine accelerometer…