Bfd b st & lt effects of exercise on cv sys session 1

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  • Mini Group Activity: In pairs, what do you think are the short-term effects of exercise on the CV system?! List as many responses as possible and be prepared to feedback to the class(7 minute activity).
  • Heart Rate increases as you start to exercise and will continue to increase as exercise intensity continues to rise. Stoke Volume (the volume of blood being pumped out per beat) also increases when exercise starts, due to the increase of oxygen demand by the working muscles. Rises during the initial stages of work and then levels off until near maximal levels where it slightly declines due to decreased ventricular filling time. Cardiac output at rest is about 5 lmin -1 and rises to between 20 and 40 lmin -1 depending on the size of the ventricle and resulting stroke volume. The volume of blood delivered to the working muscles increases with every beat of the heart and blood delivery rate increases as heart rate continues to increase. During exercise , blood flow is increased, venous return higher, the heart is stimulated to pump harder and more frequently. WARM-UP increases blood flow and delivery of oxygen in advance of major effort and COOL-DOWN keeps blood flow high, which keeps oxygen delivery, purging of oxygen debt and continuance of metabolic processes to a maximum. As you start to exercise, body temperature also increases. These are immediate responses to exercise. Once the body gets used to changes in the environment or when exercise stops, the body will eventually return to its original resting state. We will take about this on the next slide!
  • Blood redistribution – rather than overloading the heart, blood is redistributed.
  • Mini Group Activity: In pairs, what do you think are the long-term effects of exercise on the CV system?! List as many responses as possible and be prepared to feedback to the class(7 minute activity).
  • Capillaries: This improves the speed at which the oxygen diffuses from the red blood cells to the muscular tissue.

Transcript

  • 1. Effects of exercise on body systems Session 1 - The effects of exercise on the cardiovascular system
  • 2. Aims
    • Learners will be able to describe the effects of exercise on the CV System
    • Objectives
    • Identify the different short-term effects of exercise
    • Identify long-term effects of exercise
  • 3. Paired Activity Short Term Responses
  • 4. ↑ in Heart Rate ↑ in release of adrenaline ↑ in release of heat ↑ in dilation of vessels ↑ in blood flow to muscles ↑ in Stroke Volume ↑ in Cardiac Output ↑ in Blood Pressure Short Term Responses – CV System
  • 5. Short-term Responses
    • Heart Rate Inc: Heart has to beat faster to pump blood around quicker
    • Stroke Volume Inc: More blood is needed to deliver oxygen, so heart works faster to pump out more blood from the left ventricle per contraction.
    • Cardiac Output Inc: exercise = heart pumps out more blood in one minute.
    • Blood pressure Inc: in response to the body's demand for more oxygen rich blood than normal.
    • Blood redistributed: higher demand for oxygen and the removal of carbon dioxide, so the heart has to work harder to get the blood to the muscles faster.
  • 6. Paired Activity Long Term Responses
  • 7. ↑ in Cardiac Output ↑ in Stroke Volume ↑ in contraction ↑ in size of heart ↑ in haemoglobin ↓ in RHR ↑ in elasticity + thickness of arteries ↑ in capillaries Long Term Responses
  • 8. Long-term Responses
    • Hypertrophy of the heart: Like any muscle, the heart can become bigger in size.
    • Increase in stroke volume at rest: Heart has become larger it can therefore hold a larger volume of blood.
    • Increase in cardiac output: Due to hypertrophy in one beat, the heart can pump a larger volume of blood than it could before.
    • Decrease in resting heart rate: Heart is larger, it can now beat slower but still achieve pumping the same amount of blood. More efficient.
    • Increased capillaries in trained muscle: Surface area of muscles increase, so there are more capillaries around the trained muscle.
  • 9. Summary
    • Describe 2 Short-term effects of exercise on the CV System…
    • Describe 2 Long-term effects of exercise on the CV System…