Just some thoughts, and they might not be right.
You maybe overdid it on your run and it caused your heart to beat that fast.
If you overdo it your heartbeat may be elevated for the next 24-48 hours - and it will stay that way, even if you are not breathing hard.
Other signs that maybe you were overdoing it - besides elevated heartbeat - not being able to sleep, listlessness.
Was it a hot day or hot and humid? These can also cause the heartbeat to head into the red zone.
Advice I've heard is - keep your workouts short - always less than an hour, unless you are training for a marathon.
Try ultra short workouts like Tabata training - you can google it or find out more about it at cbass.com, but basically it's balls to the wall for 20 seconds, 10 seconds rest, repeated, for a total of five minutes. Doesn't sound like its all that hard, but it improved VO2 max in world class skaters in japan in six weeks.
You can do it with squats, running on a treadmill, exercise bikes - you name it.
Ultra shorts a couple times a week will burn a bunch of calories, and will really improve fitness - they just get harder and harder to face for most folks. But they really work
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