I've also experienced that the machine suggested heart attack. Both acute and old ones. I also have some ST elevation (EKG uploaded on my profile) and Q waves in inferior leads.
Yeah, thin people have higher QRS voltage. My doctor once told me; "If you don't like to see it, do some weightlifting to make some distance between the electrodes and your heart". lol. It makes sense, though. Simple physics.
The doctor did mention the high QRS voltage and said it's likely due to the fact that I am thin, so the electrodes would be very close to the heart. Since the echocardiogram showed a structurally normal heart he said not to worry about any of it. It is kind of strange though that the machine would think I was having a heart attack.
This is why EKG always should be interpreted by your doctor who knows you and your symptoms. If you were 60 years old, with a history of high cholesterol, blood pressure and smoking, and also were complaining about chest pain, this finding would be considered much more serious.
Some ST elevation is common in young healthy men. Especially with an athletic heart, you do have fairly high QRS voltage, but that could be a sign of nervousness as well. As your heart rate is close to 100, that wouldn't surprise me.
I uploaded the ecg to the profile page if anyone wants to see it.