Module 4

Module 4 - Cardiorespiratory exercise is the most important...

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Cardiorespiratory exercise… Cardiorespiratory endurance is the most important component of physical fitness and the best indicator of overall health for adults. Cardiorespiratory endurance is necessary to sustain the energy requirements of a normal life. And effective cardiorespiratory endurance levels help maintain recommended body weight. Cardiorespiratory exercise is any exercise that involves and places a stress on the cardiorespiratory system. Therefore, cardiorespiratory exercise can be achieved by any type of physical activity, and not just by exercising on cardio machines. The cardiorespiratory system is made up of the cardiovascular system and the respiratory system. The main function of the cardiorespiratory system is to provide the tissues of the body with oxygen, nutrients, protective agents and a means to remove waste by-products. And fortunately, the more physically fit you are the more efficiently your cardiorespiratory system supplies oxygen to your body. Some examples of cardiorespiratory exercise include: circuit training, running, and playing tennis. The cardiovascular system transports blood throughout the body and is comprised of the heart, blood, and blood vessels. Three basic functions of the heart include stroke volume, heart rate, and cardiac output. Stroke volume is the amount of blood that is pumped out with each contraction. For a typical adult, stroke volume is approximately 75 to 80 milliliters of blood per beat. Heart rate is the rate at which the heart beats. For a typical adult 70 to 80 beats per minute is the average. The stroke volume multiplied by the heart rate is the cardiac output. In other words, it’s how many times the heart beats per minute combined with how much blood is being pumped with each beat. A normal adult’s heart can easily pump 5 quarts of blood a minute. In addition to the heart, blood has many functions including transportation, regulation, and protection. Blood transports oxygen, nutrients, and hormones to organs and tissues, carries heat throughout body and transports waste products away from tissues. Blood aides in the regulation of body temperature and acid balance in the body. Blood protects by containing immune cells to help fight disease and sickness and is able to clot to avoid excessive bleeding. Blood vessels transport blood through a network of arteries and veins. Arteries carry blood away from the heart, while veins carry blood back toward the heart. Healthy blood vessels are essential for optimal blood flow. Atherosclerosis is the process in which deposits of fatty substances, such as cholesterol, build up in the inner lining of an artery significantly reducing blood flow through the artery, which can potentially lead to a heart attack or stroke. The respiratory system collects oxygen from the external environment and transports it to the blood
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Module 4 - Cardiorespiratory exercise is the most important...

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