What does it mean when your sprinting and you feel 2 simultaneous heartbeats?

Freddy

New member
So I wanted to how long I could sprint so I decided to sprint as fast as I could for 400m and when I did a little more I felt 2 heartbeats kind of hard on my chest and it was like dud-dud and I slowed down and jogged then walked and stopped. What does it mean did my heart skip a beat?
 
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