My pulse rate when i went to the doctor today, was 36.  I am a 15 yr. old runner. Very active, just off of a xc season.  I have also been getting very dizzy lately.  I have to go to the cardiologist as soon as possible b/c of this.  But what could it be?
Hello, Its likely an athlete heart where due to excessive exercises there is decreased heart rate. You need to get one ECG done, echo and probably will Holder monitoring thereafter, further management accordingly. Do you have any neck injuries? All the best.