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Because there is nowhere else for the air to go, it enters the eustachian tubes and the middle ear, equalizing the pressure. [4] The Frenzel Maneuver is performed as follows: [2] [3] the way out of the nasal cavity is blocked, typically by pinching the nostrils or by a nose-clip;
Plastic nose clip Wire nose clip with tether. A noseclip or nose clip is a device designed to hold the nostrils closed to prevent water from entering, or air from escaping, by people during aquatic activities such as kayaking, freediving, [1] recreational swimming, synchronized swimming and waterdance. A nose clip is generally made of plastic ...
They may use a breathing hood, facepiece or mouthpiece and nose-clip as the user respiratory interface. Atmosphere-supplying apparatus may be rebreathers with a chemical or compressed gas oxygen supply, positive pressure demand apparatus, or constant flow apparatus using high pressure compressed air. Contamination of the breathing gas may be ...
In this case a nose clip may be used if needed. Swimming aids. The most common swimming aids used by snorkellers are swimfins. A snorkelling vest may be used for buoyancy. Environmental protection. It is common for snorkellers to wear protection against exposure to cold water and the ultra-violet in sunlight.
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The technique is named after Antonio Maria Valsalva, [2] [3] a 17th-century physician and anatomist from Bologna whose principal scientific interest was the human ear. He described the Eustachian tube and the maneuver to test its patency (openness).
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