Above you'll see one of me early metabolic tests from ~16 years ago.
The black is my fat burning, the gray is my CHO burn.
As you can see, in my threshold zone, fat burning dropped to zero and every minute at 280-300W cost me ~20kcal worth of CHO stores, i.e 1200kcal/hr!
Below is another test from an elite Ironman guy.
Even though his threshold is higher than mine, he was still burning ~7kcal/min of fat in his threshold zone, i.e. even though riding *harder*, it was only costing him 13kcal/min (780 kcal/hr) from his CHO stores!
Even more importantly, when he was noodling around in his easy zone in between hard workouts, it was only costing him ~5kcal/min from his CHO stores (a number easily matched by a sports drink)!
It was costing me double this! And driving me further into depletion!
This is the big advantage of having a strong base *before* doing hard training:
* You can do much more for the same glycogen cost
* You can accumulate more easy training between without further depleting the system and therefore
So, now that we're all agreed on just how important having an #AerobicBase of strong #FatBurning is...
Just how do we go about building one?
A brief thread... π
Above you'll see data from 10 recent metabolic tests for athletes that I also have training data for.
They range from
- recreational athletes <-> elite
- super strong #FatBurners of 11kcal/min <-> athletes with very poor max fat oxidation rates of 2kcal/min..
You can see their average training intensity for the 12 mo before the test plotted against their test results. The first takeaway is obvious..
Athletes with a strong ability to use fat as a substrate spend more of their time training at a very low intensity than those who don't!
As we continue to increase the intensity of exercise after moving from nose breathing to quiet mouth breathing, eventually we encounter a second breakpoint in ventilation - the transition from quiet mouth breathing to loud mouth breathing...
At this point, metabolic acidosis is starting to increase and the body's response to it is to "blow off" the increasing carbonic acid in the form of additional CO2...
The #AerobicThreshold or first rise in the lactate curve is a key training intensity.
Primarily because it usually coincides with the highest rates of #FatBurning coupled with relatively low CHO oxidation, so the athlete can accrue a lot of work with minimal metabolic fatigue
My buddy @feelthebyrn1 always said that he could feel the AeT as:
"the first deepening of the breath"
In my experience, most athletes don't do a very good job of identifying this point & mistake their AeT for a point further up the curve. So, what should you be feeling?
2021 was the first year that I completely did away with planned load:recovery cycles (3:1, 2:1) etc & only added recovery when readiness scores were low.
This led toβ¬οΈ load for strong recoverers and better response from the load for all.
2. Less aggressive load ramps
Due to employing recovery on demand, swings in the load (both between weeks and months) were reduced compared to previous seasons.
Taking recovery with each week/block led to more gradual but consistent increases in the load.
There were 2 kids who "made it" from the squad that I swam for back in Australia. Both made the Australian National Team.
I had the good fortune to swim with them and see their struggles first hand from pre-puberty all the way...
...through to the top of the sport. One became the Australian Record Holder.
When I joined the squad, one had a modicum of "talent" - faster than me at one stroke, slower at all the others. The other was the slowest kid on the squad by a good margin...
3/x