Limit is the maximum that the body can bear during exercise. For example, when running a marathon, when the blood sugar in the body is about to run out, the human body sends out an early warning signal to protect itself and prevent hypoglycemia from affecting other organs of the body. Such as nausea, blurred vision, blurred consciousness, etc.
Heart rate is the response of the heart to external load, and it is also the most intuitive embodiment of exercise intensity. The normal heart rate of adults is 60- 100 beats per minute. Above or below this range may cause uncomfortable feelings, such as palpitation, shortness of breath and chest tightness.
Extended data:
During exercise, when the heart rate is too high, athletes can slow down, which is a good way to reduce the heart rate. But it is dangerous to stop exercising immediately. Because the heart can't adapt to this change quickly during exercise, it will continue to pump blood quickly, leading to blood accumulation in the legs, causing other parts of the body such as cerebral ischemia, dizziness may occur after exercise, and cardiovascular and cerebrovascular diseases may be easily induced.
References:
Baidu encyclopedia-heart rate limit