All methods for equalizing your ears are simply ways to open the lower ends of your Eustachian tubes so air can enter.
VALSALVA MANEUVER | Pinch Your Nose and Gently Blow
This is the method most divers learn: Pinch your nostrils (or close them against your mask skirt) and exhale through your nose. The resulting overpressure in your throat usually pushes air up your Eustachian tubes.
Pero la maniobra de Valsalva tiene tres problemas:
- No activa los músculos que abren las trompas de Eustaquio, entonces puede no funcionar si las trompas ya están cerradas por una diferencia de presión.
- It’s too easy to blow hard enough to cause injury.
- Blowing against a blocked nose raises your internal fluid pressure, including the fluid pressure in your inner ear, which may rupture your round windows. Don’t blow too hard, and don’t maintain pressure for more than five seconds.
Swallowing — and various methods of equalizing — are all ways of opening the normally closed Eustachian tubes, reducing the pressure differential between the outer ear and inner ear. The safest equalizing methods utilize the muscles of the throat to open the tubes. Unfortunately, the Valsalva maneuver that most divers are taught does not activate these muscles, but forces air from the throat into the Eustachian tubes.
That’s fine as long as the diver keeps the tubes open ahead of the ambient pressure changes. However, if a diver does not equalize early or often enough, the pressure differential can force the soft tissues together, closing the ends of the tubes. Forcing air against these soft tissues just locks them shut. No air gets to the middle ears, which do not equalize, so barotrauma may result. Even worse, blowing too hard during a Valsalva maneuver can rupture the round or oval windows of the inner ear.
Otros métodos, algunos más seguros, incluyen:
PASSIVE | Requires No Effort
Ocurre normalmente durante el ascenso
VOLUNTARY TUBAL OPENING | Tense Your Throat and Push Your Jaw Forward
Tense los músculos del paladar blando y la garganta, mientras empuja la mandíbula hacia adelante y hacia abajo, como si comenzara a bostezar. Estos músculos hacen que las trompas de Eustaquio se abran. Requiere mucha práctica, pero algunos buzos pueden aprender a controlar esos músculos y mantienen las trompas abiertas para una continua compensación.
TOYNBEE MANEUVER | Pinch Your Nose and Swallow
With your nostrils pinched or blocked against your mask skirt, swallow. Swallowing pulls open your Eustachian tubes while the movement of your tongue, with your nose closed, compresses air against them.
FRENZEL MANEUVER | Pinch Your Nose and Make the Sound of the Letter “K”
Close your nostrils, and close the back of your throat as if straining to lift a weight. Then make the sound of the letter “K.” This forces the back of your tongue upward, compressing air against the openings of your Eustachian tubes.
LOWRY TECHNIQUE | Pinch Your Nose, Gently Blow, and Swallow
A combination of Valsalva and Toynbee: while closing your nostrils, exhale and swallow at the same time.
EDMONDS TECHNIQUE | Pinch Your Nose, Gently Blow, and Push Your Jaw Forward
Mientras tensa el paladar blando (el tejido blando en la parte trasera del techo de su boca) y los músculos de la garganta, y desplaza la mandíbula hacia adelante y hacia abajo, realice la maniobra de Valsalva.
La práctica hace a la perfección
Los buzos que experimentan dificultades para compensar, pueden encontrar útil dominar varias técnicas. Muchas son difíciles hasta que se practican repetidamente, pero ésta es una habilidad scuba que puede practicarse en cualquier lugar. Pruebe practicar frente al espejo para poder observar los músculos de su garganta.
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