When is bradycardia seen as an issue. I work out on cardio 3 hours a week and have a resting bpm of 45. Would that be concerning or just due to cardio?

If you are doing-- --some serious cardio, it can just mean that you are in good shape. It becomes a problem if you have any symptoms as shortness of breath, dizziness chest or arm pain or pressure. Also if this is new & you have cardiac risk factors such as smoking, family history, perhaps a visit 2 your PCP & an EKG will put your mind at ease. .