AEROBIC SYSTEM

[ash_dhs]

i thought i was clear about this, but some reading and certain solutions has caused some concern
my belief was that the aerobic system will become DOMINANT after approx 25-40 seconds into activity
the graphs of the interplay between systems also suggests this..
however i had read some solutions to particular questions stating that it will become dominant after 1-2 minutes into activity
i was also under the impression that it will become dominant under most intesities at approx 30 seconds since that is the time it takes to take in o2 and transport it to the muscles
can someone please clarify my knowledge...tnx

[akkxn]

Annoying huh? If they ask for a time when the aerobic system becomes dominant, I think the best answer would be between 30-60seconds, with a peak power at 75 seconds. I wish the different sources would agree on a similar figure - -

[mtwtfss]

There really is no right answer.

Can someone tell me if i'm right in saying that the Aerobic System is dominant after LIP?

[ash_dhs]

well in most cases it would be, however not necessarily
when LIP is passed, LA is entering the blood faster than it can be removed/oxidised
in most cases the aerobic system would be dominant there, with the LA system also contributing significantly
however, i think the LIP can still be passed when an athlete is working predominantly from the LA system, most likely to occur during intermittent activity
but during continuous activity, your pretty much right, except remember that the aerobic system wont necessarily become dominant when the LIP is reached, it could become dominant before or even after that, depending on the intensity of activity
make any sense..??

[mtwtfss]

Yeah, i was thinking about continuous activity, aerobic is dominant then LIP occurs, then aerobic is still dominant just an increase in LA System production of ATP.

[akkxn]

VCAA makes a big deal about how the aerobic system remains dominant even after LA system becomes significantly involved after passing LIP.

However, can LA system be dominant in an instance like where the aerobic system has not had time to "warm up."

E.g. the first 30 seconds of a 400m race, LA system is dominant E.S., and LIP has been exceeded.

amirite?

[mtwtfss]

Um, i think your right yes....

[ash_dhs]

yeh it seems right
i think what theyre reinforcing is that once the aerobic system becomes dominant, it will remain so unless there is chance for recovery

[cafa]

the chart ive got at home says the aerobic system becomes dominant after 75seconds of activity, at intensities below 80% max heart rate and during rest

[melaniej]

the chart ive got at home says the aerobic system becomes dominant after 75seconds of activity, at intensities below 80% max heart rate and during rest

This is the figure I've also learned, and believe is correct.

[jakeburn]

they say in the nelsons book that resent studies show that it can come in as soon as 30 seconds 75 jest seems to long for the LA system to be predominant

[juzzyfizzle]

75 secs is when it is at it's peak power.

[chris1991]

We have been advised this year that the figure has changed to 30 seconds (it becoems dominant) rather than 75, and VCAA will be looking for 30 seconds in the exam from now on.

[mtwtfss]

it depends.

[jadfarry]

There are two aspects that need to be considered:
1. Which energy system is dominant at a specific point in time. I.e. the system that is, at that point in time, contributing the most amount of energy towards ATP resynthesis.
2. Which energy system is dominant over a specific time interval. I.e. The system that has contributed the greatest net amount of energy over the time period specified.
In terms of the aerobic system:
1. It becomes the dominant contributor of energy from the 30th second and onwards.
2. It has contributed the greatest net amount of energy from the 75th second mark and onwards (interval 0-75+).