 These rinks have hosted international events (World Cups or international senior championships) since 2005.Of these, the rinks in Calgary (~1100 meters above sea level) and Kearns (1402 m) are located at a high altitude, which is believed to enable faster times than lowland rinks, due to decreased air resistance, and also due to there being less oxygen to create bubbles in the ice.The high altitude is believed to be part of the reason that the 2002 Kearns games broke most of the previous speed-skating Olympic records.