ATAR Notes: Forum
VCE Stuff => VCE Health and Physical Education => VCE Arts/Humanities/Health => VCE Subjects + Help => VCE Physical Education => Topic started by: bucket on October 11, 2008, 04:49:42 pm
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very simple concept i'm sure, but what is it?
I've done very little homework in this subject all year :S I will love anyone who takes the time to explain what exactly happens at the LIP.
xx
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I will try answering this question as it will help me gain a better understanding of the concept. Be sure to correct me where I am wrong as I did not do units 1/2 last year and find it as a little tricky concept to get around.
Apparently, LIP wasn't done very well last year, and so, like always, VCAA tests topics that were not done well in the previous year. It is very likely that they will have LIP this year, if not all the past exam papers.
From my understanding, Lactate Inflection Point (LIP) is where lactic acid starts to accumulate in the blood stream. This occurs because lactic acid is produced faster than it can be metabolised/removed.
Intensities beyond the LIP = fatigue. The higher the exercise intensity above the LIP, the more rapid the fatigue is. This is because there is a greater reliance on the anaerobic metabolism to supply ATP, which results in accumulating by-products.
[IMG]http://img133.imageshack.us/img133/5236/fdsfme0.th.jpg[/img][IMG]http://img133.imageshack.us/images/thpix.gif[/img]
This graphs shows where LIP occurs. Be sure to know how to look at a graph and pinpoint where it unfolds.
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Ah I see, cheers mate.
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I will try answering this question as it will help me gain a better understanding of the concept. Be sure to correct me where I am wrong as I did not do units 1/2 last year and find it as a little tricky concept to get around.
Apparently, LIP wasn't done very well last year, and so, like always, VCAA tests topics that were not done well in the previous year. It is very likely that they will have LIP this year, if not all the past exam papers.
From my understanding, Lactate Inflection Point (LIP) is where lactic acid starts to accumulate in the blood stream. This occurs because lactic acid is produced faster than it can be metabolised/removed.
Intensities beyond the LIP = fatigue. The higher the exercise intensity above the LIP, the more rapid the fatigue is. This is because there is a greater reliance on the anaerobic metabolism to supply ATP, which results in accumulating by-products.
[IMG]http://img133.imageshack.us/img133/5236/fdsfme0.th.jpg[/img][IMG]http://img133.imageshack.us/images/thpix.gif[/img]
This graphs shows where LIP occurs. Be sure to know how to look at a graph and pinpoint where it unfolds.
Avoid using that statement as it is incorrect. Lactic acid has already begun accumulating before the LIP, however when it reaches a point where it is (as you say) being produced faster than it can be removed, the LIP has been reached.
A broad statement for the LIP is that it reflects the balance between lactate entry into, and removal from the blood.
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A good definition for LIP is the point at which lactate accumulation exceeds lactate removal. When LIP is reached, you are using your anaerobic glycolysis system (LA system).
Occurs at 85% MHR, but this can be increased to about 90% MHR by training at an intensity of between 85-90%MHR (anaerobically).
I think thats the main points we need to know about LIP!
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Wow, thanks a lot everyone.
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i thort that the LIP was the point at which lactate uptake and removal from the bloodstream was in equilibrium...
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It's the balance between lactate entry and removal from the blood. Therefore at intensities beyond this, then fatigue occurs. I dont think we need to be overly specific about it, just know that it is the point at which lactate accumulates, and hence leads to fatigue.
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isn't the point at when accumulation occurs called OBLA (onset of blood lactate accumulation) and LIP just refers toi the point when entry and removal is in the balance??
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LIP isn't the point when entry and removal is in balance (equilibrium).
Because if it was, then right now, where you are sitting you would be 'experiencing' your LIP.
Which of course, your not.
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LIP isn't the point when entry and removal is in balance (equilibrium).
Because if it was, then right now, where you are sitting you would be 'experiencing' your LIP.
Which of course, your not.
my pe teacher said it was the balance, and so did the guy in the lecture i went to...
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Yeah balance, but not when it equals eachother.
If it is when it equals eachother, then LIP would be the plateau in lactate levels, and not the rising of levels.
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LIP isn't the point when entry and removal is in balance (equilibrium).
Because if it was, then right now, where you are sitting you would be 'experiencing' your LIP.
Which of course, your not.
ill disagree with ya on that 1 ther 2
cause wen ur at rest wuldnt removal b higher then uptake due to cells breaking it down and the body removing it as "waste"?? taking in2 account that the lactate system does still operate during rest and ther is always at least trace amounts of lactic acid in the bloodstream at all times
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Well, they will only remove as much as they need.
ALL YOU NEED TO KNOW FOR LIP!
It is the point at which lactate begins to accumulate at a faster rate than which it can be removed.
It occurs at ~85% MHR but this can be increased to ~90% with training.
Once LIP is reached, blood-lactate levels and H+ levels increase, and if the athlete is to continue working they must decrease their intensity or fatigue will soon follow.
Just don't think too much into it, use what the textbook and notes say.
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LIP isn't the point when entry and removal is in balance (equilibrium).
Because if it was, then right now, where you are sitting you would be 'experiencing' your LIP.
Which of course, your not.
ill disagree with ya on that 1 ther 2
cause wen ur at rest wuldnt removal b higher then uptake due to cells breaking it down and the body removing it as "waste"?? taking in2 account that the lactate system does still operate during rest and ther is always at least trace amounts of lactic acid in the bloodstream at all times
If the removal is faster than enterance then we would end up with no lactate in the blood :O :O. Will never happen!
Therefore entry = removal.
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Chocadude and mel, are right
/offstudydesign - biology
In relation to lacate in the human body, at rest lactate is converted to pyruvate in the standard pathway. As the rate of lactate produciton would be relatively constant (albeit low), so to would its conversion to pyruvate.
Therefore the levels of lactate in the blood would be relatively constant
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Thank you BA22!
It doesn't really matter too much, but LIP, and all things energy systems are intriguing.
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yeh, we've been over them again this year, but in more detail
We also had lectures on how alcohol affects energy systems, som pretty interesting stuff
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i think mel summed it up the best there
ah well thers probs only gunna b 1 question on the exam neway
and also who needs lectures on the effects of alcohol on the energy systems when u can get drunk n see how far home u can run b4 u give up, my results suggest not very far;)
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just throwing it out there.. i hate my pe textbook....damn you live it up...!!!
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There was actually a clarification of the LIP by VCAA
they basically said that it reflects the balance between lactace entry and removal from the blood
once exceeded, Lactate enters the blood faster than its removed and thus it accumulates at a rapid rate
however, Lactate only begins to accumulate when the anaerobic systems are providing significant amounts of ATP, thus i would believe the LA system is significantly contributing to energy production unless the PC system has had adequate time to recover, with the aerobic system still dominant
the main point to note though is the balance
well that was my understanding and i hope it helped
ne suggestions or if im wrong, please let me know
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There was actually a clarification of the LIP by VCAA
they basically said that it reflects the balance between lactace entry and removal from the blood
once exceeded, Lactate enters the blood faster than its removed and thus it accumulates at a rapid rate
however, Lactate only begins to accumulate when the anaerobic systems are providing significant amounts of ATP, thus i would believe the LA system is significantly contributing to energy production unless the PC system has had adequate time to recover, with the aerobic system still dominant
the main point to note though is the balance
well that was my understanding and i hope it helped
ne suggestions or if im wrong, please let me know
In Malpeli's "Notes" cram book, the definition of LIP is "the point at which the appearance of lactate in the blood accumulates faster than its removal"
I feel like the vcaa definition is the one to go by, but in your response just make sure you mention that going beyond the LIP results in lactic acid accumulating faster than it can be oxidised.
However, it's still really iffy because if you think about the word Lactate Inflection Point, it kind of implies that the lactate levels "inflect" (accumulate rapidly) at that "point"
argh
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^^ and thats not to mention that its also a range of points not 1 in particular
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could anyone comment on this, In regards to Lactic Acid and Lactate is it true that they do not cause fatigue only impede recovery? Is it right to say that Lactic acid can be used to produce ATP? And is it also right to say that a measure of Lactate in the blood is an indirect measure of fatigue because it is infact the indirect measure of H+ ions the is obtained?
thanks in adavance
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could anyone comment on this, In regards to Lactic Acid and Lactate is it true that they do not cause fatigue only impede recovery? Is it right to say that Lactic acid can be used to produce ATP? And is it also right to say that a measure of Lactate in the blood is an indirect measure of fatigue because it is infact the indirect measure of H+ ions the is obtained?
thanks in adavance
I would say Lactic Acid and lactate indirectly fatigue... because H+ ions are directly linked to LA and lactate...
Lactic Acid can be used to produce ATP as well as ATP 'supplies' e.g. glycogen, when there is sufficient oxygen available.
Last point is correct.