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Juerg Feldmann

Fortiori Design LLC
Posts: 1,530
What has to be added to this  " absolute " statement   after all what we show here ?   "

Why Are Power Meters Preferred to Heart Rate Monitors?

Power meters are fast gaining popularity over the traditional heart rate monitors as they become more widely available for all types of cyclists. The reason is simple: power meters provide athletes with an instant and accurate measure of how hard the cyclist is working, whereas a heart rate monitor simply shows the response to physical activity, and there is often a time lag between exertion and heart response."  A power meter   combined with a MOXY   will tell you how much power you apply to the pedal   but you need a MOXY  to understand what this  absolute power actually creates  on stimulation  on your body. Look at the many  example s we just showed you.
600 watt on one  Day  has  or can have a very different stimulation, than 600 watt  the next day  or even in the same workout.
 You have to know how you  produced  metabolically the power  and  as  a power meter, MOXY is the only physiological tool giving you instant  physiological feedback.

Juerg Feldmann

Fortiori Design LLC
Posts: 1,530
I like to  do some more  loud thinking   on the subject  on power meter.


Why Are Power Meters Preferred to Heart Rate Monitors?

Power meters are fast gaining popularity over the traditional heart rate monitors as they become more widely available for all types of cyclists. The reason is simple: power meters provide athletes with an instant and accurate measure of how hard the cyclist is working, whereas a heart rate monitor simply shows the response to physical activity, and there is often a time lag between exertion and heart response.

Heart rate can be affected by a variety of external factors including temperature, altitude, terrain, and wind resistance as well as the cyclist's hydration and nutrition. This can result in a significant difference between workouts that is not due to how hard the athlete is working. Power meters, however, always measure the impact of the activity itself.

What are the Benefits of Power Training with Indoor Cycling?

1. Power training is possibly the best way to improve your hill climbing ability as well as improving the speed of your climb. As factors such as VO2 max and threshold heart rate actually limit your power ability

Now look carefully  at this statements  ( in red)

It is   exactly where we all sound smart  but really have  very little ideas   on what we really base this  statement.
  More and more  people accept the fact, that VO2 max  has to be  discussed  to say the least . Because of this  problem  more and more use the name  VO2 peak. Even worse is the idea  to talk about a  heart rate threshold  with all what even in this article is discussed on what can influence HR .
 But here the question.
 Why would  a VO2 max  limit power.
 Let's  take some simple example.
 A runner with a VO2  max of 85  Lets' take the  always  used example of Paul Tergat  and Lance Armstrong   an the new york Marathon,.
 . Both same VO2 max.  Why  is   the cyclist   nearly one hour slower than the runner  and why would the runner  not have  enough " Power"  if  they would have done a cycling race.
 Same VO2    not the same performance  .
 Power   can perhaps be  somewhat limited   with the  VO2   sport specific peak, but it is mainly a  question of  some many more factors   and  delivery of energy to this specific  muscles  with or  with oxygen dependent energy sources.
 If the actual strength produced  recruits  a certain amount  of motor units the  "power' May be limited due to  an occlusion occurring   in the working muscles.
 Look at our discussion  on  " what  does that mean  and look at the great example from Carson's  workout  on the 2 x 10  and than the    shorter intervals.
 Same VO2   max  in this workout  but  different ability to sustain "Power " wattage    due to different set ups  on the loads.

 This really shows  that a power meter  only  gives you a good result toward understanding changes in performance, when combined with the opportunity  to get some info's on the energy  demand  or supply.
 To have that immediately  with the power number  you need a MOXY.  Now lets' make a  very  interesting statement here:
  How about the opposite.  it is not VO2  which limits the power  but it is the ability of the power you can produce  , which limits  the VO2  needed  or used.
  look at this form the old  1967  discussion, where critical thinker  already  at that time  where sure, that there is  only a  specific  VO2 peak tested   but no such thing like a VO2  max  based on a hopefully    plateau somewhere down the road. Here   again the famous  work  by Dal Monte  on VO2   peak and   power dependent  VO2  values.

  And I like to add a result  sent to us   by Carson  as he  used MOXY  and combined it with VO2  ( max ) testing ) look at the graph  and the VO2 max trends  you have  every where a VO2  peak plateau to the load  accordingly to the O2 need , but  exactly there, at the end of the  test where  you would expect a VO2 plateau there is  none.   This   data  collection show another very intriguing  question.
  a)  remember that I argued , that the  3 min step test forces  the  result due to the lack of  sufficient times  for the systems to adjust. Well that is true  for any  test, where we  design a fixed  protocol.  we make the decision  and not the physiological possible reactions.
  Now this graph  shows  you in red the  trend in VO2 max. The  load was  high and  for sure hard  for this athlete.
 Blue shows you  the RER.  In many centers  we use RER  and  say it is equal RQ  and therefore give our client a very nice looking  and very  intelligent    sounding idea on the metabolic needs  on Fat  and Carbs.
 In simple terms  a RER  of 0.7  suggests a   manly FFA involved  energy supply.  A RER  of 1.0  would suggest a mainly " carb" involved  energy supply. So  logically half way in 0.85 it is  a mixed   energy supply.
 So what  is  when it is  as so often above 1.0 ???
 Now look at this test.  during his  1 min rest he   has a much higher  RER  indicating, that when he is doing nothing he   uses  much more  " Carbs" than when he is doing something. Question?  perhaps  RER =- RQ  at rest in a time frame of 8  plus minutes  in doing nothing or nearly nothing.
 Could it be   when looking at this reactions, that RER is  mainly  and indicator  of  releasing more or less CO2  over the respiratory system  and as such   the values  may depend  mainly on the respiration and its  ability  in a  for sure 3 min steps test rather than  any indication of    accurate  % of   energy substrate use ?
 Just a  question  I have  in may mind ?  Now , when we look at   the " real " energy  which is used  in the way on the question, whether he uses  O2 or not  than we could look at the  trend in  SmO2  rather than the trend in RER So let's look at the SmO2    in the same athletes   in the same test.  see pic.
  Now question   :
 Could it be , that the CO2  he blows out in the one minute  may reflect the accumulation of CO2  during the load  and as the load is increasing he has a problem to keep the CO2   normocapnic  and as such  can use the 1 min break to try now  to get rid of CO2  ( and indirectly H + )  to  try to  balance out  this   pH  and H + situation.  The " peak "   of VO2   at each  1 min break  indicates   the  amount of O2  which is delivered over HR  and respiration. Due to the  sudden stop of leg activity, but the lag  of the cardiac system and respiratory system , at that stop we see  approximately  how much O2   cardiac  and respiration delivered . This because the muscle needed this O2  and it is still delivered but not used at the current time.
 The still increase  blood flow   helps  to remove  and push the CO2   to the lungs  and  out  to the flow meter in your VO2  equipment  and the values  are   not  what  happens  but what  may have happened somewhere before.
 Last but not least. As  more VE  an athlete  can move  without pushing the respiration to its limit as faster he  will have the CO2  balanced  and is ready for the next load.
 Important  in game sports.
  Practical example.
 An average    ice hockey player   in the  junior  a  and  top league in Canada  , if he is not  respiratory trained   can move all out appr  15 - 200 L / min.  ( Average of a tested NHL 2011)
 A respiratory trained  ice hockey player   can move   250 - 300 L /min.
 Who will be able to remove  more  CO2 in what time ?  

  Look at the next  short   ideas  in the follow up replay  just  for the   interesting reader  , to show  how MOXY   may be able to give you an RQ trend  rather than a RER  speculation.

Attached Images
Click image for larger version - Name: hr_&_VO2.jpg, Views: 31, Size: 63.34 KB  Click image for larger version - Name: IPAHD_USA_smo2.jpg, Views: 31, Size: 72.48 KB 

Juerg Feldmann

Fortiori Design LLC
Posts: 1,530

Okay here some questions.
The following picture  is a  section of a test we do  for games sport  like ice hockey ,  rugby,  basketball  and you name it. So  for sports, where the   structured  loading  of a step test make  non sense  for us, as this athletes  have mainly one load   and it is all out.
 So the so called HI (High intensity  zone ) we find in an 5/1/5  test  is    not usable  for interval training design  in time  levels  around    4 minutes  and below.
 So the pic  shows a section of an all out load.
 The  black line in the pic  shows, where the test was stopped  . The green line as usual the trace of SmO2  .
 If you look at this athletes  SmO2  trend  you can see, that   when he starts out he uses  a lot of O2 and actually  shows  a " delivery" problem  or limitation. Not really surprising as he goes all out the . energy  use  is far  over the possible  energy delivery  , when looking  at O2. So he uses  O2   from where he can get it , but has a problem to deliver it  in a timely fashion.
 Interesting now is  that he  still has O2  available but he cant use it anymore, so he  creates a flat SmO2  level before he stops the load  . Flat would indicate a utilization limitation.
 Than he stops  but he  stays flat  for a while longer  before he  reloads  O2   ( SmO2  goes up.
 So despite the stop of the load  we see in this case  no increase  of SmO2  compared to the 5/1/5  test above where we see an immediate increase.
We than see  not just a  reloading back to  level as  in the above  assessment but we see  an overshoot of  SmO2   and than a drop back to base line.
 What does that mean?
 Is that  " good" or "bad" is a   so called  "overcompensation " we see here good or bad.
 What about the idea, that he may had an O2 deficit  after ti his hard load.  Hmmm looks to me  he actually has  more O2    in the tested area  indicating  an overload  rather than a deficit  ( EPOC ) ??

Now  this is what we  work on . This type of assessment allows us to design   a proper individual workout    time and a proper  recovery time   depending on the goal setting in interval workouts.
 But it  may be a  key tool for coaches   during a game to see, whether a certain player  should come of the field  or can go back on the field  as soon we  know  what over  and undershoot  plateau's  and   immediately load mean  for this athlete. Here to have fun.
 Why the e question with RER and MOXY. Well think  why  we may have the problem or  better   picture  we see that  what kind of a  CO2 level would we need to create a change in the SmO2  behavior     during the load  and after  the load.  Depending on the  CO2    levels ( O2  diss. Curve ) we will have a different SmO2  reaction  and as such  a change in the CO2  in the expired  air  and a change in RER  due to this  situation  and it may have a limited  information of  fat or Carb  involvement.
?? Just a critical question.

Attached Images
Click image for larger version - Name: Question_of_CO2.jpg, Views: 37, Size: 42.62 KB 

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