Post Number: 2393
|Posted on Saturday, January 23, 2010 - 02:01 pm: |
Here is perhaps an explanation to Lordpat's interesting observation in "warming up " for a race.
This is the result of a case study.
What we used is a small VO2 equipment ( FitMate ) for respiratory /pulmonary assessment.
A PhysioFlow enduro to assess cardiac hemodynamic during the test ( CO/SV and so on )
A PortaMon NIRS to see the real O2 trend when starting from a stand still and from a higher intensity stage.
A Lactate Pro to see lactate trend and to show that absolute numbers like 2 and 4 are of little value and it needs a LBP trend assessment
Here to enjoy a part of the case study . For people interested in more see under the threads " upcoming Events and activity" as we prepare for a workshop under the title (WE-Search) in California for coaches and test center, where they can see the nice tools live in action and can work with them and try bout all different ideas.
Post Number: 47
|Posted on Saturday, January 23, 2010 - 09:35 pm: |
Please explain the graph a bit better, I cannot see which 200 Watt is which. Also, your conclusions would be interesting also.
Post Number: 144
|Posted on Saturday, January 23, 2010 - 10:10 pm: |
Also Juerg, do you have a layman's explaination of watts as it relates to speed?
Post Number: 2398
|Posted on Sunday, January 24, 2010 - 04:53 am: |
The full explanation is on the human thread . Here in short. The upper NIRS graph is a slow gradual increase to the 200 watt level. So the left edge of the graph is the start of the test. Upper graph starts by 100 watt. Each vertical line is a 3 min marker and a 20 watt increase. So the first red arrow and the yellow explanation is the reach of 200 watt after starting by 100 watt and increasing 20 watt every 3 min. Than the next arrow is 220 and as you can see 240.
Red is oxygenated Hb, blue is deoxy ,green is total blood volume or better tHb. So you can see , where red drops below blue in the top. That's how long it took to reoxygenet the dropped Hb and now it drops again, as the O2 needed for ATP supply is increasing again. At that stage we see as well a trend inlactate increasing, as the O2 seems to be not sufficient fast enough anymore for ATP need and supply . Start of O2 independent energy supply. (besides immediately after the start.) You can see in the 120 step the O2 drop is getting back to baseline. In any start no matter how slow we will start in humans O2 independent and will lower the baseline in ATP. Now in the follow up the body has two tasks. 1. keep ATP using to maintain the current performance .
2. try to rebuild the ATP storage back to optimal level and or even supercompensation.
. That's what you see in a slow but controlled " warm up" Higher blood volume and higher O2 content in the available Hb( red goes up , blue drops or stays low . green goes up.
The lower graph starts on the left edge immediatly by 200 watt as on the first red arrow.
So the test started ( after a warm up ) immediately with 200 watt. That means more ATP is used immediately and the challenge 1 ( Maintain ATP supply for the needed performance and 2. try if possible to refuel.
The lactate trend shows , that the first priority ( maintain proper ATP use for the performance is the stronger stimulus , than refuelling so the high lactate level suggest a steady ATP delivery from O2 independent sources like CP and O2 independent glucose. .In this testsituation there was never a chance to have enough ATP produced to refuel the low ATP storage ( Never a chance for that person to try a decent endsprint at all, compared with the upper situation.) Now this info is very usfull for training if you decide to challenge MCT reactions ( in humans) MCT's are carrier for lactate either out of the cell MCT 4 and MCT1 a carrier into the cell.
So middle distance runners like to have great MCT4 , as they help to carry lactate out of the muscle and latate will take H+ out.
So respiration and MCT4 activity may help to imporve in the short term the performance in races up to 2 min.
Long slow endurance will increase mitochondria density to have a bigger fuel tank for the short races as well. Structural and functional combination training with an optimal mixture. but as well for a race, where you like to have an optimal fuelling of the gas tank.
Watt could be easy replaced with speed in running on a treadmill.
Example: 200 watt in this person effort is the same as 7 mph run. So the test could have be done by gradually increasing to 7 mph or starting immediately 7 mph. So watt is just another physical way of measuring performance. Could be levels as well on a cross trainers.
Hope that helps but check in the human threads.