###Human: Is it possible to have decreased heart rate due to sports activity? ###Assistant: Hi. It is quite common and normal for regular athletes to have sinus bradycardia, I saw some with heart rate down to 40 to 45 bpm daytime. At night usually, the HR is slower and it can get down to 35 bpm. As long as you remain asymptomatic that is no lightheadedness and no fainting or collapses, then no further action is required. It is not related to weight loss which could be secondary to increased physical activity and exercises. If weight loss is not deliberate, then this needs to be investigated. Weight loss and bradycardia could be seen in malnutrition patients and people with severe depression sometimes. I do not think it is the case here as you do regular exercise which is a good sign. Please be assured.