Cardiovascular fitness requires fit muscle tissue capable of using oxygen. Once the oxygen is delivered, the muscle tissues must be able to use oxygen to sustain physical performance. Cardiovascular fitness activities rely mostly on slow-twitch muscle fibers. These fibers, when trained, undergo changes that make them especially able to use oxygen. Outstanding distance runners often have high numbers of slow-twitch fibers and sprinters often have high numbers of fast-twitch fibers.Regular physical activity reduces the risk of heart disease. There is considerable evidence that regular physical reduces the incidence of heart disease. Also, it reduces the chances of early death from heart disease. In fact, the benefits of exercise in preventing heart disease have been shown to be independent of other risk factors. Inactivity is now considered a primary risk factor for heart disease.People with low cardiovascular fitness have increase risk of heart disease. The best evidence indicates that cardiovascular fitness is associated with heart disease. Research has shown that low fit people are especially at risk. In addition it has now been demonstrated that improving your fitness (moving low fitness to the good fitness zone) has a positive effect on health.
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