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Altitude: Altitude or height is defined based on the context in which it is used (aviation, geometry, geographical survey, sport, atmospheric pressure, and many more). As a general definition, altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object.
Altitude sickness: Altitude sickness, the mildest form being acute mountain sickness , is the negative health effect of high altitude, caused by rapid exposure to low amounts of oxygen at high elevation. Symptoms may include headaches, vomiting, tiredness, trouble sleeping, and dizziness.
Altitude (triangle): In geometry, an altitude of a triangle is a line segment through a vertex and perpendicular to a line containing the base (the side opposite the vertex). This line containing the opposite side is called the extended base of the altitude.
Altitude diving: Altitude diving is underwater diving using scuba or surface supplied diving equipment where the surface is 300 metres or more above sea level (for example, a mountain lake). Altitude is significant in diving because it affects the decompression requirement for a dive, so that the stop depths and decompression times used for dives at altitude are different from those used for the same dive profile at sea level.
Altitude training: Altitude training is the practice by some endurance athletes of training for several weeks at high altitude, preferably over 2,400 metres above sea level, though more commonly at intermediate altitudes due to the shortage of suitable high-altitude locations. At intermediate altitudes, the air still contains approximately 20.9% oxygen, but the barometric pressure and thus the partial pressure of oxygen is reduced.Depending on the protocols used, the body may acclimate to the relative lack of oxygen in one or more ways such as increasing the mass of red blood cells and hemoglobin, or altering muscle metabolism.