Side Effects. Side effects are rare; still symptoms like ear irritation, acute inflammation of the ear canal and pinna are reported. In some cases the pet might experience lack of appetite, vomiting, diarrhea, or hearing loss during the course of treatment, which might require immediate medical aid.
Furthermore, if the median age of a marathon participant is about 40, then the average maximum heart rate of a U.S. marathoner is about 180. Seventy percent of 180 is 126, while 80 percent is 144. Therefore, the heart rate of a mid-pack runner during a marathon is near the middle of the range -- between 126 and 144, or 135 beats per minute.
I am 50 and therefore should have a Maximum heart rate of 170. However, I often exceed that on a run (a 2 mile run recently got to 174 and when training in the gym the other day I got to 176). I check my heart rate at rest last week and it was 54.