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The first world record in the 400 m for women was recognized by the International Amateur Athletics Federation, now known as the World Athletics, in 1957. To June 21, 2009, the IAAF has ratified 27 world records in the event. Their 2009 record progression list, however, lists 26 records. [1]
The women's 400 metres hurdles is an outdoor track event over a distance of 400 metres with ten hurdles at the height of 76.2 cm (30 inches). [1] The world records of this women's event have been recognised by World Athletics (called the International Association of Athletics Federations until 2019) since 1974. [2]
The stiffness of the boot enhances the precision of the crampon and allows a climber to pursue steeper and more difficult terrain. Another important aspect of mountaineering boots is warmth. To prevent frostbite in extreme cold conditions, synthetic insulation is incorporated into the boot. Lighter weight boots are classified as single boots.
A vacuum is the best insulator, but its use in clothing is impractical. Dry air is a practical insulator. Extreme cold weather clothing uses still dry air to insulate the body, [2] layers of loose air trapping material are most effective. The inner layers should conduct moisture away from the body.
Mountain walking or hiking boots are designed for mountain and hill walking, backpacking and mountaineering. Crampons can be attached to them for a better grip on glaciers or hard-packed snow. They are extremely strong, and durable, and have stiff soles to give the ankles support and protection on difficult rocky trails.
Women's 400 metres hurdles. at the Games of the XXVI Olympiad. Venue: Centennial Olympic Stadium: Dates: 28 July 1996 (heats) 29 July 1996 (semi-finals) 31 July 1996 ...