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Consistent aerobic exercise has many physiological effects on the cardiorespiratory system. The heart like any other muscle needs exercise, this exercise comes in the form of aerobic exercise. In this assignment I am going to illustrate the changes

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Introduction

Anatomy and physiology Task 3 Consistent aerobic exercise has many physiological effects on the cardiorespiratory system. The heart like any other muscle needs exercise, this exercise comes in the form of aerobic exercise. In this assignment I am going to illustrate the changes that occur in certain areas of the cardiorespiratory system when aerobic exercise is undertaken: > Stroke volume > Heart rate (pulse and rhythm strip) > Cardiac output > Blood flow > Myocardium > Fatty deposits > Capillarisation Stroke volume As a result of aerobic exercise the S.V. shows an overall increase. S.V. at rest is substantially higher after an endurance training programme than it is before training. The graph above shows the changes in stroke volume of a subject before and after a six-month endurance-training programme. After training the left ventricle fills more completely during diastole than it does in an untrained heart, this happens because of an increase in the blood plasma volume, which in turn means more blood is available to enter the ventricle causing an increased end diastolic volume (EDV). ...read more.

Middle

Rhythm strip 1 is a normal sinus rhythm at 80bpm, if we compare this to rhythm strip 2 we can see that is faster. Rhythm strip 2 is a normal sinus bradycardia, which is a slow but regular heartbeat that is common to people with a good level of aerobic fitness. It is clearly evident that in a person with good aerobic fitness that the heart is not having to work as hard and fast to meet the demands of the body. Cardiac output H.R. and stroke volume are the two main factors that affect cardiac output. When at rest or during sub-maximal exercise at a steady rate of work, cardiac rate does not change much following a period of endurance training, however, cardiac output increases considerably at maximal rates of work. This increase results primarily from the increase in stroke volume. Maximal cardiac output can range from 14-20litres/min in an untrained person to 40L/min or more in a highly conditioned endurance athlete like Paula Radcliffe. ...read more.

Conclusion

They also have approx 50% higher capillary to fibre ratio than the untrained man. The existing capillaries in trained muscles can open up more, which increases blood flow through the capillaries and into the muscles. A more effective redistribution of blood can also increase flow to active muscles. Blood flow can be redirected to the active muscles and pulled away from the areas that have less demand. Organ Percentage Volume (ml/min) Hepatic-splanchnic 27 1350 Kidneys 22 1100 Muscles 20 1000 Brain 14 700 Skin 6 300 Heart 4 200 Other 7 350 Total 100 5000 The table above shows the distribution of 5 litres of cardiac output to the organs of the body. During exercise this can change and the muscle receive the most of the supply, almost 85% of blood is redistributed to the muscles. Fatty deposits A healthy cardiovascular system may aid sporting performance but it also has substantial health benefits. Benefits of aerobic exercise: 1. Reduced risk of coronary heart disease 2. Reduction of percentage body fat (weight loss) 3. Improved circulation 4. Reduced risk of cancer 5. Reduced risk of diabetes 6. Improved immune system ?? ?? ?? ?? 1 ...read more.

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