Acute responses

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Acute Responses to exercise. VCE Physical Education VCE PE Hub

Acute Responses to exercise. VCE Physical Education VCE PE Hub

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