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Cory Booker wore an Oura Ring during his 25-hour speech.

According to The New York Times, his ring asked him if he was working out and showed that “his heart rate shot up to over 100 beats per minute.”

100bpm is the higher end of what’s considered a normal resting heart rate. The fact Booker considers that “shooting up” probably means his resting rate is lower. The ring asking if he was exercising indicates the device correctly identified Booker experienced an unusual for him amount of physiological stress.

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