The heart rate after exercise has not been able to come down, it may be due to too intense exercise, and the rest time is short caused by, should extend the rest time; there may be atrial fibrillation and hyperthyroidism disease and other diseases caused by the heart rate fast. 1. Intense exercise: the heart rate does not come down after exercise, due to the large amount of exercise and short rest time, it is recommended to measure the heart rate after resting for 30 minutes and prolong the rest time, most of the heart rate can come down after resting, according to their own physical condition to do the right amount of exercise. 2. Atrial fibrillation: If you have atrial fibrillation, your heart rate will continue to decline after exercise, so it is recommended that you go to the hospital in time to check the electrocardiogram, and follow the doctor’s instructions to use drugs such as Betalucil to lower your heart rate. 3. Hyperthyroidism: If you have hyperthyroidism, after strenuous exercise, the thyroid hormone increases, the heart rate becomes faster, you can follow the doctor’s prescription oral methimazole, propylthiouracil and other drugs. The heart rate after exercise has not been down may also be other reasons, to go to the regular hospital in time to follow the doctor’s instructions for diagnosis and treatment, so as not to delay the condition.