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S.M.

Development Team Member
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Posts: 65
 #1 
Here is another endurance triathlete with over 10 years experience.  Last year he struggled with cardiac fatigue.  On his last assessment his limiter was respiratory.  He would tell you he is a better runner than a cyclist however on every bike workout his SmO2 is mid 80's with good watts but each run following the day after a bike he only sees SmO2 get to 70 ish.  Because of his work schedule he gets 36 hours recovery between run and bike but only 12 hours between bike and run.  His instruction for every workout is to attain the highest SmO2 for that day and stay there as he is just getting back into longer workouts after a brief time off.  He has run a 3:30 marathon and can run a 4:00 marathon in Ironman.

Here is his run workout from today with what he did:

"Ran the first 15’ at 6kph then upped to 7kph till 30’ then upped to 9-10kph (10 kph seemed too fast for this early) noticed the numbers dropping so at 40’ I backed off to 8-9 kph"

Dennis April 10.PNG 
This is run on a slightly rolling course near his house.
Thoughts?
 

Juerg Feldmann

Fortiori Design LLC
Registered:
Posts: 1,530
 #2 
Sandy  two  ideas  to r try, but first some thoughts.
1.  Running and biking have  , if you use the vastus  lateralis  two  very different reactions in  muscular contraction. In  cycling you have  a concentric  load  versus an  eccentric  /concentric  reaction in running.
 So the influence on tHb is   big  an therefore the influence on delivery of blood ( O2 ).  In Theory
 the tHb   may be lower in  running due to the eccentric higher  muscle tension (In theory). If  he has  or had a  cardiac  limitation  and we  have now in rung a reduction in preload  due to  lower tHb   we   stress his cardiac system  more over HR than   SV  and  therefor  we may see a less optimal delivery.
 Now  again  dangerous  conclusion.
 Reality is  go  and  test   20 - 30 min  run  followed with same  moxy setting by a  20 - 30 min bike  back to  a run and back to a bike  take HR  and MOXY feedback and if you can respiratory  rate as  simple   bio marker  and than we  have  a better picture on what happens. What intensity. Now here we us performance  and look how the physiology has to react.
 So use  HR  or   better  speed and wattage.  Use the upper  end of the STEI  zone  for running    and the same  for biking.  and repeat the same  physical load  the second time around.

  Below  to show you the influence on concnetric  and  than a high eccentric  reaction on SmO2.

This is a case study  we did  with Portamon.
 It is  same  load  ( speed  so  6  km/ h  run  and walk. The run is much more eccentric  and in this slow pace  even more   as it is very inefficient. so a  very clear drop in SmO2    and the walk is   fast but little eccentric  due to the walking  situation.


 total 60  tsi.jpg

Here a person we look first in Biking and than running ( It is a runner )

same  HR  low  SmO2 training.jpg 

You can see  HR  150 no problem  in running to maintain. In cycling we had to push. So no delivery problem  but utilization problem in cycling. In running he  recovers  after the  initial start  and SmO2 increases  so good  delivery    over time  and just initial  delivery problem  compensated by a  good utilization


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