Development Team Member
Registered: 1382660870 Posts: 65
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"This is run on a slightly rolling course near his house. Thoughts?
Fortiori Design LLC
Registered: 1355349061 Posts: 1,530
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. Here a person we look first in Biking and than running ( It is a runner ) 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