Author: Rafael Figueroa
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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…
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Five Things Your Wearable Stress Score Isn’t Telling You
Your wearable stress score does something genuinely useful — it tracks your autonomic nervous system’s response to physiological load overnight. But wearable stress score accuracy has a hard limit: the device reads the body’s sympathetic signal without knowing what triggered it. Why wearable stress score accuracy breaks down in real life Lab studies consistently show…
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Oura vs Whoop vs Garmin: which reads your nervous system most accurately?
Choosing the best wearable for HRV accuracy isn’t just a spec question. The answer depends on when you’re measuring, how hard you train, and what you’re actually trying to learn. The best wearable for HRV accuracy is not the one with the most features — it’s the one that measures in the right place, at…