MUSCLE PHYSIOLOGY

Detailed explanation-1: -During exercise, your body may need three or four times your normal cardiac output, because your muscles need more oxygen when you exert yourself. During exercise, your heart typically beats faster so that more blood gets out to your body.

Detailed explanation-2: -Exercise causes an increase in pulse rate (heart rate). When exercising our muscles contract more often and require more energy. Energy is made during the process of respiration . As more glucose and oxygen is needed, cardiac output (blood pumped per minute) and blood flow to the muscles increases.

Detailed explanation-3: -When the heart beats too fast, it may not pump enough blood to the rest of the body. As a result, the organs and tissues may not get enough oxygen. In general, tachycardia may lead to the following signs and symptoms: Sensation of a racing, pounding heartbeat or flopping in the chest (palpitations)

Detailed explanation-4: -When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide. To cope with this extra demand, your breathing has to increase from about 15 times a minute (12 litres of air) when you are resting, up to about 40–60 times a minute (100 litres of air) during exercise.