First, muscle aches.
Muscle soreness refers to the pain, stiffness and discomfort of muscle tissue within 24 ~ 72 hours after physical exercise or other physical activities. This phenomenon is called delayed muscle soreness, also known as DOMS (delayed muscle soreness).
DOMS is a normal physiological reaction, especially when you start exercising again or increase your intensity. It is usually caused by small injuries to muscle tissue, which can cause the accumulation of heat pain substances, cytotoxins, inflammatory cells and other metabolic wastes. These substances stimulate muscle nerve endings, causing muscle pain and stiffness.
Second, abdominal pain during exercise.
Overeating, eating high-fat, high-sugar or high-fiber foods, or improper eating time may all cause abdominal pain. Eating too fast or too dense before exercise may lead to gastrointestinal reaction, causing diarrhea or gastrointestinal discomfort. During exercise, the body will supply blood and nutrients to the muscles, and at the same time, the intestine will contract.
Colic refers to intermittent abdominal pain caused by strenuous exercise or adjacent stimulation of bladder and uterus. It is easy for the body to sweat during exercise, which will lead to imbalance of water and electrolyte, thus causing muscle spasm and abdominal pain.
Third, the heart rate is accelerated.
Increased heart rate is a common physical reaction, which usually occurs when the body needs more oxygen and nutrition, such as exercise, labor, tension or excitement.
When the heart rate is higher than the normal range, the body will speed up breathing to provide enough oxygen. When the heart is exercising, it will strengthen its contraction, pump blood out of the whole body more effectively, deliver oxygen and nutrients to various organs and tissues, and bring carbon dioxide and other wastes back to the lungs and liver for cleaning.
Usually at the beginning of exercise, the heart rate rises gradually, reaches the highest point, and then slowly falls down and returns to a calm state. Generally speaking, the amplitude and time of heart rate increase depends on the intensity and type of exercise, personal physical condition and other factors.