How to say BTV in English ?

[subaquaticus]

Originally Posted by Rémi

"Tubaire" just does not sound good here to me... which is very subjective .. ok
But a "tubule" is a very small "tube", so it is more likely to be tubulaire I think....
But that's not really important

BTV has something to do with the Eustachian tube ( http://www.merriam-webster.com/cgi-b...ustachian+tube ) which is not at all very small

You also have the Malpighian tubule which is a group of long blind vessels opening into the posterior part of the alimentary canal in most insects and some other arthropods and functioning primarily as excretory organs.

You also have the seminiferous tubule which is one of the coiled threadlike tubules that make up the bulk of the testis and are lined with a layer of epithelial cells from which the spermatozoa are produced.

These "tubules" are much smaller than the Eustachian tube which is relevant here...

[subaquaticus]

Taken from this interesting web site :

http://www.paradise-divers.com/reading.htm

Equalizing Techniques

• Valsalva - increase nasopharynx pressure by holding nose and breathing against a closed glottis (throat);

• Toynbee - swallowing with mouth and nose closed - good for ascent!

• Frenzel - Valsalva while contracting throat muscles with a closed glottis;

• Lowry - Valsalva plus Toynbee - holding nose, gently trying to blow air out of nose while swallowing - easiest and best method!

• Edmonds - jutting jaw forward plus Valsalva and/or Frenzel (good method);

• BTV (Béance Tubaire Volontaire - Voluntary Tubal Opening) - Described by the French doctor Georges Deloncas, the BTV is a hands-free technique mostly used by free divers because it is very efficient even during a fast descent. Deloncas reported that a small percentage of divers (around 30%) are actually able to train their throat muscles to contract and open the Eustachian tubes on demand, as a prolonged action and not a simple spasm. The tubes' shape must be near perfect and a lot of training is required; it is, however, the ideal solution since it frees both hands, is none-forceful and works as well during descent and ascent;

• Miscellaneous - swallowing, wiggling jaws - good for ascent!

[Panos Lianos]

I think the website you mention has things mixed up a little. For the Valsalva, how can you equalize if your glottis is closed? The openings of the Eustachian tubes are ABOVE the glottis, so if you keep it closed, then the air can't reach them.

BTV is efficient in freediving, only if your physiology permits. I can do it on dry land and in the pool. But in the sea, because of the rapid pressure changes, I can't. For other people it works fine, usually up to a certain depth and then, most need to use the Frenzel to go deeper.

For the majority of people, the most efficient method is the Frenzel.

[subaquaticus]

Originally Posted by Panos Lianos

For the majority of people, the most efficient method is the Frenzel.

I confess to my greatest shame that up to now I haven't really understood what the Frenzel is...

I think I do in dynamic apnea a BTV quite unaware of it...

In vertical diving I still need the Valsalva...

That is why I strongly envisage to acquire a Paradisia in order to be hands free while "Valsalva-ing"...

[subaquaticus]

Originally Posted by Panos Lianos

I can do it on dry land and in the pool. But in the sea, because of the rapid pressure changes, I can't.

I think that it is the same for me as for you...

[DeepThought]

Originally Posted by subaquaticus

I confess to my greatest shame that up to now I haven't really understood what the Frenzel is...

www.ericfattah.com/equalizing
or
http://www.liquivision.ca/equalizing

For some strange reason I can't access it at this moment but it should be there.

[pat fish]

Originally Posted by Panos Lianos

It is VERY close. The new rules have been voted and they will be posted very soon.

thank you Panos - I am excited and wondering about the impact on achieved depths in competitions.. !