Acute responses


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Acute Responses to exercise. VCE Physical Education VCE PE Hub

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Acute responses

  1. 1. Acute Responses to Training<br />
  2. 2. Before we start<br />This presentation has gaps in it for a reason<br />That reason is that the creator is slack but also very busy<br />But an excuse for this slackness is that this might actually be useful to students – less is more (well some people say more is more, but ignore them)<br />Fill in the blanks – that’s a start<br />Do more – ask questions, expand on what’s here, think<br />
  3. 3. Outline<br />Exercises places different demands on the body when compared to rest<br />Short-term changes that occur in responses to exercise are termed acute responses<br />Depend on factors such as exercise intensity, duration, muscle groups used, external and internal environment, etc.<br />Acute responses can be described as occurring at three levels – in three different body systems<br />All systems interact to facilitate muscular contraction<br />
  4. 4. Outline<br />Respiratory system – oxygenates blood<br />Cardiovascular system – comprised of the blood, heart and blood vessels; its role is to circulate nutrients and remove wastes<br />Cardio = heart , vascular = blood vessels<br />Muscular system – where muscular contractions occur which allow movement of the skeleton<br />
  5. 5. Key Knowledge/Skills<br />The mechanisms responsible for the acute responses to exercise in the cardiovascular, respiratory and muscular systems<br />Participate in physical activities to collect and analyse data relating to the range of acute effects that physical activity has on the cardiovascular, respiratory and muscular systems of the body<br />
  6. 6. Important concepts<br />Diffusion – net movement of molecules from a region of high concentration to a region of low concentration –<br />Intramuscular environment – production of ATP based on differing concentrations – mitochondria release ATP, myosin crossbridges use ATP<br />Surface area – an increased surface area means that there are “more places” for diffusion to take place<br />
  7. 7. Respiratory system<br />Ventilation is…<br />Ventilation = ? + ?<br />As exercise begins, ventilation increases due to skeletal muscles contracting and hormonal changes. As exercise continues blood pH levels decrease and the control centre in the brain detects this and increases respiratory rate<br />Ventilatory threshold and contributions of TV and RR<br />Surface area of what increases due to what?<br />
  8. 8. Respiratory System<br />Gaseous exchange – where, why, how?<br />What are the alveoli?<br />Increased pulmonary diffusion – more oxygen and carbon dioxide are exchanged at the alveolar-capillary interface<br />
  9. 9. Cardiovascular system<br />Cardiac output (what letter?) = ? + ?<br />Patterns of increase<br />Blood pressure (systolic increases)<br />Blood flow (redistribution, its effects and how it changes with increasing duration)<br />Venous return – the muscular pump<br />Blood volume (decreases due to factors such as sweating)<br />A-VO2 diff. (direct measure of what?)<br />
  10. 10. Muscular system<br />Blood flow – how?<br />Motor unit recruitment<br />Energy substrates (and what relates to this?)<br />Metabolic by-products<br />
  11. 11. Thermoregulation <br />Why is heat created, how is reduced, which mechanisms, etc.<br />Vasodilation and sweating<br />Muscles generate heat during energy production<br />
  12. 12. Yay!<br />Presentation over<br />Now it’s off to hit the books <br />Students visiting Facebook will be punished severely<br />Students playing sport and not doing homework are exhibiting correct behaviour and should continue<br />Have fun!<br />