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Is it possible for my heart rate to be 255 beats per minute?

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Just went jogging 20min ago and sprinted the last 300m, according to to my Garmin forerunner 210 my heart rate was at a maximum of 255 beats per minute. Is that possible? and if it is possible, did i damage my heart? not feeling very well at the moment, my heart rate is lingering at 90 beats per min at the moment, my normal rest rate is 55 beats per min.