Okay, so you've decided to induce adjustment, where could that be a good start?

 Okay, so you've decided to induce adjustment, where could that be a good start?

 Okay, so you've decided to induce adjustment, where could that be a good start?

Cardiovascular fitness is sometimes called "cardiovascular endurance" because a person with this type of fitness can exercise for long periods of time without undue fatigue. It has been called "cardiorespiratory fitness" because it requires the supply and use of oxygen, which is only possible if the circulatory and respiratory systems can perform these functions.

The term "aerobic fitness" has also been used synonymously with cardiovascular fitness, as "aerobic fitness" is considered the best indicator of cardiovascular fitness, and physical activity or aerobic exercise is the preferred method of achieving it. Regardless of the words used to describe it, cardiovascular fitness is complex because it requires the fitness of multiple body systems.

Good cardiovascular fitness requires healthy heart muscle. The heart is a muscle; To get stronger, it must be trained like any other muscle in the body. When the heart is exercised regularly, its strength increases; if not, it weakens. Contrary to the belief that strenuous work is bad for the heart, research has found no evidence that regular progressive exercise is bad for the normal heart. In fact, the heart muscle will increase in size and strength when it is asked to expand. The increase in size and strength allows the heart to pump a greater volume of blood with fewer beats per minute. The average person has a resting heart rate between seventy (70) and eighty (80) beats per minute, while it is not uncommon for the pulse of a trained athlete to be below fifty or even forty.

A healthy heart is efficient in its work. It can convert about half of your fuel into energy. A well-functioning car engine converts about a quarter of its fuel into energy. By comparison, the heart is an efficient motor. The heart of a normal person beats reflexively about 40 million times a year. During this time, more than 4,000 gallons, or 10 tons, of blood circulates daily, and each night the workload is the same as the workload on the heart of a person carrying a 30-pound package to the top of the 102-story Empire. . State construction.

Good cardiovascular fitness requires a healthy vascular system. Healthy arteries are elastic, unobstructed, and expand to allow blood to flow. Layers of muscle line the arteries and control the size of the arterial opening in response to the impulse of the nerve fibers. Mismatched arteries may have a reduced inside diameter due to debris within their walls, or they may have hardened inelastic walls.

Fit coronary arteries are especially important for health. Blood in the four chambers of the heart does not directly feed the heart. Rather, numerous small arteries in the heart muscle ensure blood flow. Poor coronary blood flow caused by diseased arteries can be the cause of a heart attack.

Veins have thinner walls and less elastic than arteries. The veins also contain small valves to prevent blood from returning to the heart. The veins are intertwined in the muscle; When the muscle contracts, it compresses the vein, forcing blood back to the heart. A malfunctioning valve will cause used blood to not be drawn at the correct rate. As a result, venous blood, especially in the legs, accumulates and causes a condition known as varicose veins.

Good cardiovascular fitness requires healthy blood and respiratory system. The process of taking oxygen (through the mouth and nose) and carrying it to the lungs, where the blood picks it up, is known as external respiration. External respiration requires healthy lungs and blood with sufficient hemoglobin in the red blood cells. The inadequate oxygen-carrying capacity of the blood is called anemia.

The release of oxygen from the blood to the tissues is called internal respiration. Internal respiration requires a sufficient number of healthy capillaries. These systems not only deliver oxygen to the tissue but also remove CO2. Good vascular fitness requires the fitness of both the external and internal respiratory systems.

Cardiovascular fitness requires muscle tissue in a form that can consume oxygen. Once oxygen is released, muscle tissue must be able to use oxygen to maintain physical performance. Cardiovascular conditioning activities rely primarily on slow-twitch muscle fibers. When this bezel.