The relationship between dynamic apnea and depth?

[trux]

Simplified told, the trendlines show linearized average interpolation relationship between the two disciplines. Or even simpler - the line in the field of points, it is as if you were trying to cut a loaf of bread into two halves of the same weight. The line tries to go through the field of data in the same way, while being anchored in the zero point (the previous series of graphs did not have the start point fixed, hence could chose the ideal "cut" better).

The X/Y ratio then shows the average ratio between the two disciplines (or the steepness of the line), and the R2 expresses the goodness of fit (how well the data fits to the idealized linear formula).

The graphs show the following global averaged correlations between disciplines:

DYN = 136.5% of DNF (DNF = 73.3% of DYN)

CWT = 139.6% of CNF (CNF = 71.7% of CWT)

DYN = 232.5% of the CWT depth (CWT depth = 43.0% of DYN)
DYN = 116.3% of the CWT distance (CWT distance = 86.0% of DYN)

I'll look into the STA correlations, but since I do this manually (need to manipulate the huge data, generate and format the graphs, convert to images, upload them,...), it always takes a bit work and time. I actually wanted to add this graphs to the online interface, so that they can be generated automatically for selected club, gender, country, continent, or region, and chosen time span, and also wanted to add the evolution of the ratio in time for individuals or groups. It will require some more work and time though, so cannot tell when it happens. If any scientist is interested in the graphs, or want other graphs or statistics, they can contact me anytime, of course.

 

[trux]

OK, here you go:

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The ratio STA/DYN is 2,584, in other words:
STA = 258,4% of DYN [m] (DYN [m] = 38,7% of STA )

So for example with 330 seconds (5'30") you should do 330/2.584 = 128m to be in the average.

 

[Erki]

Surprisingly weak correlation between STA and DYN, but somehow its also tells a lot.

Slope ~2.5 on STA/DYN graph shows that the current point system is ok, but it still underrate no fin dissiplines.

I did also some silly extrapolations... if we take Mullin's 232 m DNF and multiply it with 1.36 (slope of DYN/DNF correlation) then we get that it corresponds to 315 m DYN... and if we multiply it with 2.5 then we get 787 s (13 min 7 second) for STA...

 

[trux]

Now you at least know why Dave's club is called the Lazy Seals - he could easily break Mifsud's STA record, and bring the DYN WR far over 300m, but is just too lazy for doing so.

 

[dimitris33]

Question raised last night,

What is the relationship between DYN and walking apnea??

If someone can do for instance 100m DYN how many meters this can be translated in walking apnea?

 

[Erki]

I presume that the ratio between walking apnea and DYN is about 2:1. But it depends on several individual factors.