What happens when physical exercise.
In muscles. Working muscles consume more glycogen (glucose stored in the mitochondria of cells), take more glucose from the blood and burn fat, blood-borne of the locations of its accumulation. Enhanced metabolism requires more oxygen, and the additional inflow of blood to the otherwise very quickly fatigued muscles. All the necessary switch in the body produces brain.
Glycogen originally come from internal sources of carbohydrate, but prolonged activity ultimately produced from the accumulated fat. In the lungs. The depth and frequency of breathing immediately amplified. Normal ventilation for an adult is 10-12 liters of air per minute, during strenuous exercise can increase by 10 times. Lungs of healthy non-smoking men easily taken out of the air is sufficient for any reasonable amount of oxygen stress.
Feeling of "lack of air" has no relation to the capacity of your lungs, just your heart and blood vessels are not able to carry enough oxygen to the muscles. You will understand it, remembering that endurance exercise strengthens the cardiovascular system, but not easy. In blood vessels. Soon after, the muscles begin to work with the load, the decomposition products diffuse into the surrounding tissue, causing the overall expansion of the blood vessels, thus increasing blood flow.
Decomposition products stimulate the brain to return the team to enhance the blood flow to working muscles. During intense exercise the muscles can use the bloodstream up to 20 times higher than under normal conditions. In the heart. Heart rate is increased to provide the necessary circulation. In humans, more than 40 years, do not exercise, the heart rate at rest is about 70 beats per minute. With an average load, it could double, while increasing the load to reach 180.
On average, men in resting heart pumps about 75 ml of blood per contraction. Exercise can increase this volume by more than 50%. Minute volume of blood pumped in the rest of about 5 liters of blood (70 beats, multiplied by 75 ml) may during exercise increased fourfold. Blood pressure. When measuring blood pressure are controlled by two phases: systolic - the maximum pressure developed during contraction of the heart and diastolic - the minimum pressure when the heart is relaxed between contractions.
Level equal to 120/80 mm Hg, respectively. Art., it is generally accepted normal rate, but the pressure does not remain constant as the person does not have an absolutely fixed heart rate and breathing. On this basis, are considered acceptable pressures between 100140 systolic and diastolic 60-90. When you exercise systolic blood pressure increases to 180-190, but the diastolic (pulse), the pressure should not vary. His rise under load is a sign of heart disease: it means that the heart is not able to properly respond to it.
When doctors removed the electrocardiogram (ECG) under load, increasing diastolic blood pressure - and not the most electrocardiogram abnormality - may be the first signal of a weak heart. If there are deviations in the ECG exercise are vital as strengthen the heart - the most important muscle. But in this case it is necessary to close medical supervision.