Presentation on theme: "The Benefits of exercise on the CV System."— Presentation transcript:
1The Benefits of exercise on the CV System. Mr. P. LeightonGCSE PE
2Today’s Session…All of you: will understand the benefits of regular exercise on the CV system.Most of you: Will understand the key terms Cardiac Output and Stroke Volume when talking about the CV System.Some of you: Will be able to attempt the exam style question at the end of the session.
3Recap: 5mins- So what happens to the body during exercise?
4While all this is happening… Lactic acid builds up during exercise.It is poison to you body- it can cause cramp and eventually stop muscles working.The reason it is used is because Glycogen stores in muscles are depleted.Athletes must rest to allow the blood to bring fresh O2
5So we can produce energy… AerobicallyWith Oxygen in AEROBIC RESPIRATIONAnaerobicallyWithout Oxygen in ANAEROBIC RESPIRATION
6So what happens if you carry on exercising? Decrease in HR.Heart recovery rate increasesIncreased Stroke VolumeCardiac Output increases.Blood Pressure is reduced.Healthy arteries and veins
7Decrease in Heart Rate… Resting HR gives an indication of fitness.The heart is a muscle- the fitter you are the bigger and stronger it gets.It can then supply the same amount of blood with fewer beats.
8Heart Rate Recovery Increases... The faster the recovery rate, from WORKING to RESTING HR, the fitter the person.Christine Ohuruogu working HR could be like yours- her resting HR is as low as 40bpm
9Increased Stroke Volume… Stroke Volume is the amount of blood pumped by the heart per beat.When a person exercises regularly, Stroke volume increases; both at rest and at work.At rest it can be 85ml.At work stroke volume could be 130ml: half a cup of water every beat!
10Cardiac Output Increases… Cardiac Output is the amount of blood ejected from the heart in one minute.It is governed by the heart rate (pulse) and stroke volume.The equation to calculate cardiac output is…Cardiac Output(CO)Stroke Volume(SV)Heart Rate(HR)
11Blood Pressure Reduces… Regular exercise reduces blood pressure.Exercise can help with weight loss.Extra weight puts strain on the heart and increase blood pressure.Factors which can affect blood pressure are age, sex, muscular development, stress and tiredness.Is there anything else that can affect it?
12Healthy Veins and Arteries… Fitness increases the number of capillaries within the heart muscle.It also makes blood vessels more flexible and efficient.What happens if you have a heart attack?
14Recap…All of you: will understand the benefits of regular exercise on the CV system.Most of you: Will understand the key terms Cardiac Output and Stroke Volume when talking about the CV System.Some of you: Will be able to attempt the exam style question at the end of the session.