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Circulatory/Respiratory System Question

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cobby:
Well atm, yr 11 is really cruisy, had a circulatory/respiratory test on the last week of term i think i got about 75%, wasnt overly disappointed with that, now first week back we've got a test on energy systems, do u mind shedding some light on what u believe are the key concepts for this topic?

Stephanie:
With energy systems the thing you have to remember and what they keep drilling into people yet assessment reports still state that people dont quite understand, is the fact that all three energy systems are activated at the start of physical activity and that one just doesnt turn off or on, one just takes over and becomes the dominant ATP provider, even a 100m sprinter uses their aerobic system i thinks its about 3% or something but dont quote me on that. having any difficulties with any part of it???

cobby:
umm well i dont quite understand the points at which each system takes over from the others respectively, the book doesnt quite explain at which point they over-ride each oher?

transgression:
This is the energy system Interplay, where in the first 0-10 seconds, the most dominant system is the ATP-PC system. After this, the LA system becomes the dominant system as the PC stores are generally depleted. The aerobic system kicks in during the 60-75 second mark, as a consequence of the longer duration of the exercise/activity.

It is important to note that one system will become DOMINANT than the others during a particular time.

Stephanie:
The ATP-PC system is dominant for about the first 7 seconds - some text books say up to 10 seconds but nothing higher than that, The Lactic acid system is the dominant provider from then on till it fatigues at about 2-3mins, and the aerobic system becomes increasingly dominant as the lactic acid system fatigues. It all depends on the intensity of the activity - anything about 85% of max heart rate is an anaerobic activity. But with an aerobic activity like a marathon or 1500m swim or something just because the anaerobic systems cant be the main ATP providers due to the intensity of the activity and the fact they are pretty much depleted, doesnt mean they can contribute. Like at the end of a 1500m swim say the last 25meters although it is still an aerobic activity the lactic acid system would fuel that burst as the intensity is increased. Am i confusing you? i cant remember how much detail you need to know for year 11. sorry if you have no idea what im talking about

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