So, meanwhile no way to get a chart like that ?
Tks
thanks for quick response
I did another test with same result (so no point bothering you with fit file) but after that I switched to ble connection and there are some diferences:
- not sure why but it takes much longer to get 100% (like 3x longer)
-too tired to make another test today but readings are much lower alpha-1: 0.70 when resting
-tomorrow will try again but probably need to get anothe betterr strap
The wahoo heart rate monitor does not work for anything related to HRV, so neither DFA nor respiration rate will give you correct data.
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In Excel, my simplistic approach using the limited mathematical knowledge I have, would be to extract the 2 sections of data where the curve is linear. Section A-B and C-D in the graph.
Filter that extracted data for outliers using some sort of Std Dev filter. Then let Excel determine a trendline for both sections. From the trendline formula’s, calculate the intercept.
You should be able to get in the ballpark but this method will not give a consistent result simply because another person might draw the lines a bit differently….
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This is basically the procedure. However, in excel you must select manually the range of data for each linear regression as it only allows single linear regressions. So, results can be affected by the user selection, especially when both areas are not clearly defined, as you remark.
alphaHRV desktop automatically provides the best bilinear regression with no need to split the data. It is still under development, but giving nice results
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Be careful because it can be affected by high heartrates, so the idea would be not to exceed 90% of the ftp in the tests.
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I’m not planning on doing this. I’m waiting until you guys release the app.
I was just replying to the question of someone less patient 
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I know, the only thing is that we are doing a lot of tests and we have to get something that is valid, although it will probably need some interpretation by the coach, the problem we have in Spain is that we do not have any help and we are paying for everything from our own resources so everything goes slower, I have to do lactate, you know that the test strips are not cheap, then I transfer everything to Iñigo and he starts to refine everything, we meet, we talk about the results, we test again and so we are all day. Spain is different
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Truly understand this situation… same w/ me on developing the BreakAway: Indoor Training app. Worst is I need to sit on the trainer most times when I make a trainer related change as some parameters can’t be simulated. (like HR variations and having that control the trainer)
As an aside, i thought that using DFA-a1 for training was prev marked as not so “applicable”, but seems like you guys are really going into it w/ lab tests and all that.
I have tried it previously and I’m not certain it’s useful for me as the data that came out looked “suspect” to me.
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We know that the standard values of 0.75 for AeT and 0.5 for AT are not valid for many athletes, with this we are trying to show that we have personalized values of DFA-Alpha-1, in my case tested with lactate and respiratory rate is AeT= 1.00 DFA so the value of 0.75 doesn’t make any sense to me (before covid my AeT was 0.75, tested with lactate too), we encountered this problem but tried to solve it by looking for a custom range, the tests are very exciting . Imagine that we extract a custom value in a work range of AeT (80-100% of AeT) and assign a DFA value to 80% and one to 100%, if we graph the sessions at the beginning we will see which day is placed in those values and the average of dfa will be within that value, after several weeks we will verify that the value of dfa has changed by increasing its value, which means that we have improved. Imagine that one day you do a session and DFA drops more than necessary, we know that something is happening (illness, tiredness, etc…) This is the approach we are giving to DFA and respiratory rate.
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Hello everyone, I would like to know if there are any “norm” values for the DFA Alpha 1 at rest?
I feel like I’m way down…
Thank you for your feedback!
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dfa-a1 at rest has no meaning as far as I know. It is a metric related to workout intensity.
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It can change a lot, it depends on several factors, there is no standard value at rest.
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doesn’t the Polar H10 strap has 4 pads whereas most other straps only have 2 larger ones?
is there a difference at all?
Garmin dual also has 4 pads. The difference is that I now have almost no artifacts. Polar strap was good in the beginning, but signal quality went bad after 7-8 months of use. I had troubles measuring morning HRV and a1 during exercise. Believe me, you don’t want the stress of troubles in the morning…
I’ve been looking out for a place to buy some spare straps, but if you find them, they are usualy expensive. To the point that they cost more then half the price of a complete new strap. So if someone has a lead, I want to hear it.
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DFA at rest is a good indicator of how fatigued you may be (there is no standard value), look at the behaviour when you start training, DFA will go down and then it should go up, you have to analyse how that rise is and how long it takes to go up, after chatting with several colleagues we believe that the generation of catecholamines at the start of the training session makes dfa go down (initial stress) and then it recovers, if it takes time to recover we have also observed sympathetic activation. It is also interesting to see the average dfa-a1 in the warm-up and the average in the cool-down (10 minutes in both cases). We are going to put this with the metric we are studying.
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I have a Polar H9. Went wonky after about a year. Got it replaced under warranty but the hassle of being without it during warranty replacement was a pain
Somewhere on the forum I have a thread in which you wrote that you use a replacement of the h10 band from the garmin sensor.
I can’t find it now, can you write what band you use?
Me the first h10 band “fell” after five months, I bought a new one (in fact, half the price of the new set), but then I made a complaint and fleece in less than 30 minutes after replacing the e -mail with support, he sent a new band.
Two of my friends also “fall bands” from H10.
Maybe our sweat is somehow more "aggressive?
For my part, I conduct hygiene of the band after each activity.
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You can use Polar H10/H9 or alternatively the Garmin HRM Dual with the latest firmware.
