Posted by Juerg (207.194.220.194) on January 22, 2004 at 08:52:14:
In Reply to: Lactate paradox thoughts posted by Frank Day on January 22, 2004 at 06:20:41:
Thanks Frank for your addition.
It's exactly how we see it.
Frank makes , because of his experiences with his own genial product , a very important point.
The " beginner" on PC who likes to be a serious cyclist will have to be a little bit patient. ( You have to be this anyway , if your goal is to move up your real structural performance)
A lot of people who start with PC will very fast if on a home trainer increase the resistance , so they can use power .( and do not feel or lock as they think stupid ) So it seems to be initially easier , but more demanding on the metabolic challange , and they will use mainly FTF fibers ( FTF a and FTF x )
They , because of the short duration may have some problem to attract the STF into the game. They may sit on the side line and enjoying life. ( Sounds very human does it. )
So the from Frank made point seems to be an important part as well. Cadence. We try to encourage people to not get into the idea to give more resistance. The poor hip flexor are overloaded anyway, but rather learn to keep the cadence on a proper level.
In an elegant paper by Sargeant and Rademaker 1996 Human muscle fiber types and mechanical efficiency during cycling .
They could show how RPM and the recruitment of muscle fiber are connected..
They showed quite nice that on the one side by a low RPM 30 - 60 and low enough power ( EMG activity below 30 - 40 % of max activity or 30 - 40 % of max power the STF fiber are the preferred motors.
By about 80 RPM + - 10 STF and FTF are working both, and once you go in the 130 / 140 RPM range you lose STF and limit yourself to FTF.
The conclusion is now up to you. We tried 100dreds of tests with this basic research and I am sure we will have one or the other more discussion coming up here.
Now short to the hint of perhaps using EMG to see whether you should quitt a workout because of overload or fatigue or what ever we use to think , this is enough.
After we finally acceptet the fact , that LBP Watt is different a ) on each side ( l and R )
and different on different pedal system , we were keen to see why ?
EMG : very stupid definition here , but to make it as easy as possible.
EMG measures muscle activity ( electric intensities )
If you have 1 fiber working you have a low reading. If a second fiber is added your activity will be higher. when you have 10000 working it will be much higher.
The EMG tells us: a) is the muscle activ.b) are a lot of the fibers active.
c ) what is for the moment my highest activity.
If you look from an intermuscular coordination you can see the " flow " of a movement.
Do you call properly 1,2,3,4 ( good coordination ) or do you have 1,3,2,4 not yet optimal coordination. which may lead to earlier fatigue .
Besides overload of the hipflexor because of weakness ( power ) they may are getting tired because of the later statement as well.)
Intra muscular coordination is in contrary the coordination , where we see how many fibers are helping on the job site.As higher the EMG as more likely we have hired a lot of the fibers.
But there are only so many fibers who can do the job. (never all ).
So at the beginning of a training we may improve A ) intermuscular b intra muscular.
All functional reactions, and only later in your training you may start to change structurally.
That's may be one reason , why we have a sudden stagnation in " Talents" because they reached their maximum in function., but never added some structur in their training idea.
When we now use PC you could see a very rapid increase in activity in 2 - 3 min. Than a sudden drop and than the exercises was over for the moment.
If we tested the max. possible EMG activity , let's say 60 micro Volt and we could keep the activity under 50 % ( 30 ) we immediatly could lengthen the training on the PC.
So if the EMG started to come close to the 30 we reduced the resistance .
Once we reached 50 the pressure from the muscle was mechanically so high , that there was a reduced or now blood supply to the working muscle and it was therefor clear what would happen.
We use this info know in training and races, so when the athlete is feeling ( high tension or metabolic fatigue in the race, he will try to change the technique from perhaps proper 360 to perhaps a few minute just pushing only or pulling only or more on 1 leg focusing.
Now that's the reason why we do all this stupid exercises.
Sorry have to go , will be back later.