Your watch can detect stress before you feel it
By tracking the millisecond variations between your heartbeats, modern wearables can identify a spike in cortisol before your brain even registers a feeling of anxiety.
Your nervous system often knows you are overwhelmed long before you start to sweat or pace. Advanced trackers like the Whoop Band monitor heart rate variability, which is the tiny, inconsistent gap between each heartbeat. When you are relaxed, these gaps vary significantly; when you are under physical or emotional stress, your heart begins to beat with a rigid, metronomic regularity that the human pulse cannot detect.
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