I like to add some more ideas into this discussion with some case study back ups.
1. MOXY and maximal strength. The delay time of equipment.
Here a discussion we have as an example of increasing questions from many more MOXY users.
Hi Roger, Juerg, Andri:
I sometimes notice a delay in MO2 changes, and am working to confirm whether this is real physiology or just a data delay from processing/capture/transfer etc. Here is my situation. Using data direct from the monitor not from peripedal, using the average column not the live MO2 (though this doesn’t seem to change whether I see a delay) and the settings on the monitor are default (I believe 0.5Hz + smoothing).
If I start a clock and say have someone do fatiguing max exercise test for example, and stop the clock at the exact point at fatigue. Then when I go back and look at the MO2 data, it seems there is a delay of ~10-20 seconds before I see the MO2 at its lowest points. ….and to my question, is it that there is a point in data capture in the Moxy device, or data upload that would delay the reading by this much? Should I adjust for some time factor? Or assuming that you are unaware of a delay in data collection, I can assume that this is the real physiology….that when a person says they are fatigued, there is actually still a reduction in MO2 following the cessation of exercise.
Hope all is well.
Part of the delay is from the smoothing filter in the Moxy on SmO2. In the default mode, every displayed value is the average of the last 5 rolling calculated values. A new data point is calculated every 2 seconds so this filter causes about a 5 second delay in the data (1/2 of the total filter time).
If you are looking at a 20 second delay, that is longer that anything the filter could have caused so there must be a physiologic contribution as well.
Okay here one thing you can try to see, whether theory and practice works. Again look at the forum , when we did blood test to see what happens with influence of respiration ion lactate H + and bicarbonate.
See att as a simple guide.
What you do is:
Do one set as before look at the delay and the respiration which takes place. Than second set start before the set with a 10 - 15 second hypocapnic respiration drop EtCO 2 down if possible to 20 mmHg and than start the load but immediately double the respiration with the same d TV but double RF all during the load and look what happens to the SmO2 delay. Sent me the csv file as a payment for the idea ( Smile ) second att is a study with exactly this delay. see yellow section. att 3 is blood test to see, what happens as we do the respiratory intervention.
Delay of SmO2 after load
Influence of respiration on blood values
In low respiratory volume change during hard workouts your Pa and PA CO2 goes very high , your EtCO2 measured at the mouth my look the opposite depending on TV size.
So now as you stop you have a O2 diss curve extremely to the right and it takes as you can see about 15 +- seconds to ventilate finally as much as possible and CO2 can only move decently once the in between Pa and PA when the pressure difference is okay.
So the low SmO2 with a high EtCO2 can even show up on your finger with a puls oxymeter and balance of this is about 15 +- seconds.
Question, whether MOXY (tHb ) could give some indication of quality of muscle contraction.
Here a case I will get back later from a workout Ruud did a few days ago.
Will be back on that one just look at pictures and trends same scale used.
Here first a few loads at the start of an " all out " MOXY controlled workout.
Now last few sets
Now look at the power change during an all out load from first few sets and last few sets in one example. and than go back and look at tHb trend over the time , where we have a minimal power loss before we loose it completely.
Which color may represent an early load and which one a later load. Now just for fun : Purple is power data from this workout. Goal was to refuel always back to the same level.
Now look power data and no w look tHB as a possible indication of power information on quality for muscle contraction and relaxation. Good relaxation means high tHb at rest , good contraction means low tHb at end of load. ( exception , when venous occlusion shows up. Cycling is NOT explosive really so we should rarely see a direct venous occlusion at a start.
last but not least. To target low SmO2 is a question of how hard you accept to push so SmO2 low levels may fluctuate form that point of view.
But recovery SmO2 values can be targeted very accurate. So here the recovery SmO2 values . Look towards the end , when he really waited to baseline 80 and how the SmO2 peak looks.
Not optimal recovery workout yet but very good for a first time use.
How would the workout have looked , when he waited for really full recovery ?