Could heart palpitations be caused by over-exercising?

Hello doctor,

I am a 46-year-old male with a desk job that requires me to sit for eight hours continuously at the computer. I have been suffering from these problems for the past 27 years. When I was 19 years old, I did heavy exercises once, and suddenly my heartbeat increased to approximately 180 beats per minute. It returned to a normal rate within a minute, but from that day, I have been experiencing heart palpitations. I stopped all the exercises.

I underwent an ECG and a 2D echocardiogram, both of which were normal. One doctor said my heart is "almost" normal, while another suggested it might be a valve problem, though he made this suggestion without conducting any tests. My primary symptoms have been heart palpitations and a feeling of pressure in my heart, which persisted for four to five months. After that, I felt normal and attempted to exercise again, but I experienced the same symptoms, prompting me to stop exercising once more. This cycle has been repeated many times.

Three months ago, I experienced these symptoms again, along with dizziness, which frightened me. I immediately consulted a cardiologist. The ECG, 2D echocardiogram, and treadmill test (which I had for the first time) all came back normal. I did not undergo an angiogram. Now, I am experiencing breathing difficulty, dizziness, and irregular heartbeats when lying on my side. I have completely quit exercising and am only walking.

I do not understand what is going on. Am I straining myself during exercise, or could this be a serious problem?

Please help me.

Hello doctor,

Thank you for the reply.

I do not understand. Are you saying that my heart is normal? Does that mean I do not need an angiogram? What are T4, T3, TSH, and Holter monitoring?

I was doing yoga but quit because of the palpitations. I am also following a healthy diet. Should I submit my recent reports?