I have once in a while a sense like my heart is bitten for few secs or minutes, then its gone.i am an athlete healthy diet no cigarette..why i have it?

Premature heart beat: This sounds lie premature heart beats- a palpitation often described as a heart skip. An ectopic early bet arises in either the upper (pac) or lower (PVC) chamber with a subsequent pause and then a normal beat after. The event often feels like a real strong beat (base drum) after the pause. These occur either on their own or in te setting of increased sympathetic or stimulant effect on heart.