A swimmer's heart rate is usually several times per minute when he is quiet.

40 to 60 times. Generally speaking, the normal heart rate of normal adults in a quiet state is about 60 to 100 times per minute. However, due to long-term swimming training, swimmers have got a good exercise in their heart function, and sinus bradycardia can be observed when doing ECG. This heart rate will not affect the health of athletes, mainly because the reserve function of athletes' hearts is good. In sports competition, the heart will increase with the increase of exercise and the extension of exercise time, the heart rate will be accelerated, and the myocardial contractility will be enhanced, which can ensure that the heart pumps enough blood to meet the oxygen demand of body muscles and other tissues and organs during exercise. So in a quiet state, their heart rate is generally lower than that of ordinary people, which will be lower than 60 beats per minute, about 40 to 60 beats per minute.