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A high-fidelity heart rate variability (HRV) tracking system that uses a chest strap to measure the intervals between heartbeats with millisecond precision. It is used by athletes and health-conscious individuals to monitor recovery, stress levels, and nervous system balance. The device pairs with an app to provide deep insights into how lifestyle factors like sleep, exercise, and diet affect the body's autonomic nervous system.
Elite HRV is what I was using with the strap. I'm going to guess you'll have seen... the strap that came with the Elite HRV thing.
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"Chris Williamson mentions using the Elite HRV strap while in a hyperbaric oxygen chamber to perform resonance breathing. He specifically notes the high fidelity of the device for tracking heart rate."