The relationship between dynamic apnea and depth?

[trux]

OK, so after the critics, I took a bit more serious approach, and made two distribution charts for you. Have a look at the two charts below. The first one is for CWT/DYN, and the second for CNF/DNF. In both cases I took the all-time PB's of all competitors with results in both respective disciplines, and plotted a point for each such ratio (comparing dynamic distances with doubled depths). Both genders are mixed.

There are 832 competitors with both CWT and DYN results, and only 220 competitors with both CNF and DNF PB's, so the CNF/DNF chart is a bit less populated.

In this way you can see how much the ratios vary. Still, there is a well noticeable trend (especially in the CWT/DYN chart) - the ratio clearly grows with performance.

 

[Mullins]

Great graphs Trux. Show that the better you are in depth, the more likely you are to be stronger in depth than in the pool i.e. specialisation is usually required in order to perform well. Presumably graphs showing pool/depth percentages would show the same effect - the higher the DYN scores, the higher the DYN:CWT ratio.

Interesting that distribution rises with performance, particularly for CWT/DYN.

 

[trux]

And some more food. A combined graph with the distribution of both CNF/DNF and CWT/DYN in the same chart.



And I added also graphs for CNF/CWT, DNF/DYN, and DYN/STA ratios. Much bigger data samples in these cases.

 

[trux]

Presumably graphs showing pool/depth percentages would show the same effect - the higher the DYN scores, the higher the DYN:CWT ratio.

Here you go - this is the combined chart of the same ratios CNF/DNF and CWT/DYN based on the dynamic distances, instead of the depth:

 

[Mullins]

Thanks Trux. Yeah, shows the same story - the better you get in the pool, the lower the depth as a percentage of distance. If you had shown distance/depth in the Y axis it'd look similar to the other graphs.

Though... the better DYN athletes seem to be more consistent in depth than the best depth athletes are in the pool.

 

[trux]

Yes, you are right. Just notice the difference of the tendence - while at the depth based graph, the growing tedence is very strong, at the dyn based graph the average tendence is almost stable (horizontal), decreasing only rather gently. The completely opposite tendence of fluctuation is also interesting, as you noted too (the biggest fluctuation with growing depth performance, while a very opposite effect with growing dyn performance)

 

[rascolor]

Hiya good tread, its interesting i train 2-3 times a week at pools and my dyn is about 70 meters, for some reason i dont like dyn verry mutch, bud i like depth fim and no limits i only do at the moment 40meters fim and 50 no limits bud really enjoied depth compare to pool discyplines.

 

[azapa]

the depth/pool thing seems to work depending on the divers mental strength too: its very easy to bale a pool dive 'cause it feels bad, but depth is easy to push oneself.

FIM is for me the ultimate lazy freedivers goal pusher, easy to get deep, then you HAVE to get back.

All the above is true for intermediate divers. More advanced divers have the two breaking points (physical and mental) synchronized therefore the differences will be less.

 

[Krakenlims]

i came on here coz i was taking a break form revising for a statistics exam, and all i find is more statistics!!! haha good stuff tho

I'm still relatively new to this so my PB's are kind of still settling, but, i have a 40m CWT and 70m DYN. and 5 min static

I enjoy the mental gymnastics of apnea..
Doing depth, i empty my mind on decent, soon after the turn i kind of wake up.
my mind will go through a few steps at lightening speed so that i almost don't notice it thinking: "i am very deep and low on air, my best chance of survival is to relax by accepting the situation", in dynamic, relaxing is not ur only hope and you do not have to accept the situation.,, thus my dynamic is less

 

[rascolor]

Hi azapa you right fim is kind a lazy go down bud is slow bud progress i still kind a working on my mental issue it will get there with time.
TaKe care.

the depth/pool thing seems to work depending on the divers mental strength too: Its very easy to bale a pool dive 'cause it feels bad, but depth is easy to push oneself.

Fim is for me the ultimate lazy freedivers goal pusher, easy to get deep, then you have to get back.

All the above is true for intermediate divers. More advanced divers have the two breaking points (physical and mental) synchronized therefore the differences will be less.

 

[trux]

I will add the graphs shown above to the Apnea.cz ranking, and many other charts too. Currently I've just completed an interface allowing me to display graphs online, and as the first I've added radar graphs to the personal profiles. I posted the explanation in the ranking thread.

 

[Erki]

Trux, can you add trendlines and correlation (R or R squere) values for the DNF/DYN etc graphs? This would be a good way to analyse different dissiplines and find out how much results correlate with each other.

 

[trux]

Here you go - DYN/DNF with a linear and a polynomial trendlines:

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[Erki]

Actually I thought just simple DYN vs DNF, DYN vs 2xCWT etc plots with linear trendlines. Then the values of slopes are coefficients helping to compare results from different dissiplines and R square values characterize how similar are correlated dissiplines.

 

[trux]

I am afraid I do not understand what you are looking for. The graph above is just a simple DYN vs DNF, and there is a linear trendline in it too (the red line). If you need something else, I can send you the data in an Excel file, and you can add any graphs you want.

 

[Erki]

May be I misundersand but I see plots DNF/DYN ratio (%) vs DNF (m). I just ment DYN (m) vs DNF (m) etc.

 

[trux]

Ah, OK, I see now - I did not undestand that detail. Here you go:

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PS: I like in the graphs how clearly you can see the pool walls, and in case of of DNF/DYN in both axes

 

[Erki]

Thanks! These are nice figures!
For slopes it would be interesting also to force the trendlines through zero.
I believe that this data could be published as a scientific paper after analyses and presentation in a proper format.

PS I didn't undersand your pool wall remark?

 

[trux]

OK, there it is with the trendline anchored to 0,0 here:

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With wall comment I ment that in the graphs you can clearly see more density each 50m (little less clear at 25m) - because people usually either stop at the wall, or when they turn, they do a few meters more.

As for the scientific parper - if you are interested and have the possibility to publish it, I am not against it, as long as you keep me as co-author

 

[Goran Colak]

Interesting work Trux, can you explain me the position of trendline in DYN vs DNF? And can you put STA vs DNF and STA vs DYN graphs to? And then explain the trendline there...? If that isn't to much trouble

I believe that there will be a lot of people interested in making a scientific project of of this in Croatia. And there is already a group of huge project happening right now, regarding freediving, here in Croatia.