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The Signal
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The Signal
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Science
The Signal
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Science
The Signal
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THE SIGNAL
Category: Biometrics & Data
Research, clinical applications and platform insights from the Sensor Bio Team.
Biometrics & Data
Cold plunge and HRV: what your wearable shows the morning after
Biometrics & Data
Wim Hof breathing and HRV: what the science actually says
Biometrics & Data
Fall detection science: accelerometer thresholds, context, and false-positive tradeoffs
Biometrics & Data
Smart Ring vs Wrist Wearable: Signal, Noise, and Measurement Limits
Biometrics & Data
PPG beat detection algorithms: how peak timing becomes heart rate and HRV data
Biometrics & Data
R-R Interval vs Pulse Interval: How ECG and PPG Timing Signals Differ
Biometrics & Data
Polyvagal Theory: Evidence, Accuracy, and Clinical Use
Biometrics & Data
Parasympathetic Saturation Explained: What the Research Shows
Biometrics & Data
Vagal Tone Meaning: What the Vagus Nerve Has to Do With HRV
Biometrics & Data
Sympathetic vs Parasympathetic: How the Two Autonomic Branches Differ
Biometrics & Data
Dysautonomia Explained: What the Evidence Actually Shows
Biometrics & Data
HRV vs Resting Heart Rate: What Each Metric Tells You, and Why You Need Both
Biometrics & Data
How to Improve Heart Rate Variability: What the Data Actually Shows
Biometrics & Data
PPG vs ECG vs Pulse Oximetry: What Each Modality Measures, What It Misses, and Why the Distinction Matters
Biometrics & Data
Photoplethysmography (PPG): Principles, Signal Components, Derived Features, and Real-World Limits