Pole vault

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Pole vaulting is an athletics event where competitors use a long, flexible pole as an aid to leap over a bar, similar to the high jump, but at much greater heights. Pole jumping competitions were known to the ancient Greeks, as well as the Cretans and Celts, but with these exceptions there is no record of its ancient practice as a sport.

1 History
2 Modern vaulting
3 Sequence
4 Common Pole Vault Terminology
5 References
6 See also

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History

As a practical means of passing over such natural obstacles as canals and brooks, pole vaulting has been used in many parts of the world, such as in the marshy provinces of Friesland in The Netherlands along the North Sea, and the great level of the fens of Cambridgeshire, Huntingdonshire, Lincolnshire and Norfolk. The artificial draining of these marshes brought into existence a network of open drains or canals intersecting each other at right angles. In order to cross these without getting wet, and at the same time avoid tedious roundabout journeys over the bridges, a stack of jumping poles was kept at every house, which were commonly used for vaulting over the canals. In Friesland, where it is called fierljeppen, it has continued to be a folkloristic activity with annual competitions. Broad-jumping with the pole, though the original form of the sport, has never found its way into organized athletics, the high jump being the only form recognized.

Modern competitions probably began around 1850 in Germany, when it was added to the gymnastic exercises of the Turner by Johann C. F. GutsMuths and Frederich L. Jahn. The modern pole vaulting technique was developed in the United States at the end of the nineteenth century. In Great Britain it was first commonly practised at the Caledonian games. Initially, vaulting poles were made from stiff materials such as bamboo or aluminium, until the introduction of flexible vaulting poles made from composites such as fiberglass or carbon fiber. Physical attributes such as speed and agility are essential to pole vaulting effectively, but technical skill is an equally if not more important element. The object is to clear a bar or stick supported upon two uprights without knocking it down. While women's pole vault records were kept for many years, the event only started to gain popularity in the 1990s.

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Modern vaulting

Today, athletes compete in the pole vault as one of the four jumping events in track and field. It is also the eighth event in the decathlon. During a competition, a bar progression is chosen by an event official. The progression goes from an initial height, called the opening height, presumably a height that all competitors are capable of clearing, and progresses higher by even increments. Typical increments are six inches in high school competitions, or 10-15 cm in collegiate and elite competitions. Competitors can enter the competition at any point in the progression. After entering the competition, the vaulter has three attempts to successfully clear the bar. After a successful clearance, the vaulter may jump at the next height in the progression, or choose to pass to a higher height. A vaulter is out of the competition when he/she misses a bar three consecutive times. A "no height", often denoted NH, refers to the failure of a vaulter to clear any bar during the competition.

Having cleared the highest height, the last competitor remaining in the competition wins. Vaulters are placed first, second and so forth according to their highest cleared height and the number of attempts that were taken to clear that height. A tie can occur when two or more vaulters have the same number of misses at every height. Ties can be broken in what is known as a jump-off. A jump-off is a sudden death competition in which both vaulters attempt the same height, starting with the last attempted height. If both vaulters miss, the bar goes down by a small increment, and if both clear, the bar goes up by a small increment. A jump-off ends when one vaulter clears and the other misses.

In Britain at one time the vaulter was allowed to climb the pole when it is at the perpendicular. Tom Ray, of Ulverston in Cumbria, who was champion of the world in 1887, was able to gain several feet in this manner. The equipment and rules for pole vaulting are similar to the high jump. Unlike high jump though, the athlete in the vault has the ability to select the horizontal position of the bar before each jump and can place it anywhere from 40 cm to 80 cm beyond the back of the box. If the pole used by the athlete dislodges the bar from the uprights a foul attempt is ruled, even if the athlete themselves have cleared the height. However if the pole breaks during the execution of a vault, the competitor will be allowed another attempt, assuming they can still walk.

There are many physical, psychological, and environmental factors that can contribute to the success or failure of an attempt, including speed, technique, height, jumping ability, strength, confidence and mental preparedness, wind speed and direction, temperature, etc. The vaulter must choose a pole with length and stiffness that is matched to his ability, which may vary according to the above conditions. The mere act of choosing a pole can have a significant effect on a vaulter's jump, as a pole that is too elastic will cause the vaulter to penetrate too far into the pit, sometimes flying underneath the bar before achieving maximum height, and a pole that is too stiff can cause the vaulter to be rejected backwards, in extreme cases landing back on the runway or in the metal box into which the pole was planted.

Poles are manufactured with ratings corresponding to the vaulter's recommended maximum weight. Some organizations forbid vaulters to use poles rated below their weight as a safety precaution, though such rules are rarely enforced. The recommended weight corresponds to a flex rating that is determined by the manufacturer by placing a standardized amount of stress on the pole and measuring how much the center of the pole is displaced. Therefore, two poles rated at the same weight are not necessarily the same stiffness. Because pole stiffness and length are important factors to a vaulter's performance, it is not uncommon for an elite vaulter to carry as many as 10 poles to a competition. The effective properties of a pole can be changed by gripping the pole higher or lower in relation to the top of the pole. The left and right handgrips are typically about shoulder width apart. Poles are manufactured for people of all skill levels, with sizes as small as 10 feet, 90 lb, to as large as 17+ feet, 230 pounds.

Although there are many techniques used by vaulters at various skill levels to clear the bar, the generally accepted technical model can be broken down into several phases, listed and described below:

The Approach consists of the vaulter sprinting down the runway in such a way as to achieve maximum speed upon reaching the pit. The pole is usually carried upright to some degree at the beginning of the approach, then gradually lowered as the vaulter gets closer to the pit. By doing this the vaulter can use the potential energy stored from carrying the pole upright to his advantage. It is common for vaulters to use long, powerful strides at the beginning of the approach, then accelerate by increasing stride frequency. Unlike short sprinting events such as the 100m in which a forward lean is used to accelerate, vaulters maintain an upright torso position throughout the approach because staying as tall as possible is important to the next phase of the vault.

The Plant and Take-off is initiated typically three steps out from the final step. The goal of this phase is to efficiently translate the kinetic energy accumulated from the approach into potential energy stored by the elasticity of the pole, and to gain as much initial vertical height as possible by jumping off the ground. The plant starts with the vaulter raising his arms up from around the hips or mid-torso until they are fully outstretched above his head, with the right arm extended directly above the head and the left arm extended perpendicular to the pole. At the same time, the vaulter is dropping the pole tip into the box, a trapezoidal indentation in the ground with a metal or fiberglass covering. On the final step, the vaulter jumps off the left leg and drives the right knee forward. As the pole slides into the back of the box the pole begins to bend and the vaulter continues up and forward, leaving the left leg angled down and behind him.

The Swing and Row should be initiated as soon as possible after the take-off, as any delay could cause a wasteful loss of potential energy in the pole. The swing and row simply consists of the vaulter swinging his left leg forward and rowing his arms down, while trying to keep both arms and left leg as straight as possible. Effectively, this causes a double pendulum motion, with the top of the pole moving forward and pivoting from the box, while the vaulter acts as a second pendulum pivoting from the right hand. This action results in even more potential energy being stored in the pole, all of which will be returned to the vaulter in later phases. The swing continues until the hands are near the shins and feet of the vaulter, with the vaulter facing upward in a curled position. The curled position is also known as "the basket" and is generally held slightly longer when trying to attain higher heights.

The Rockback refers to the extension of the hips upward with outstretched legs as the shoulders drive down, causing the vaulter to be positioned upside down. This position is often referred to as "inversion". While this phase is executed, the pole begins to recoil, propelling the vaulter quickly upward. The hands of the vaulter remain close to his body as they move from the shins back to the region around the hips and upper torso.

The Turn is executed immediately after or even during the end of the rockback. As the name implies, the vaulter turns 180° toward the pole while extending the arms down past the head and shoulders. Typically the vaulter will begin to angle his body toward the bar as the turn is executed, although ideally the vaulter will remain as vertical as possible. A more accurate description of this phase of the vault may be "the spin" because the vaulter spins around an imaginary axis from head to toe.

The Fly-away is often highly emphasized by spectators and novice vaulters, but it is arguably the easiest phase of the vault and is a result of proper execution of previous phases. This phase mainly consists of the vaulter pushing off of the pole and releasing it so it falls away from the bar and mats. As his body goes over and around the bar, the vaulter is facing the bar. Rotation of the body over the bar occurs naturally, and the vaulter's main concern is making sure that his arms, face and any other appendages do not knock the bar off as he goes over. The vaulter should land near the middle of the foam landing mats, or pits, face up.

The pole vault is exciting to watch because of the extreme heights reached by competitors, and the inherent danger of the activity, two elements which combine to make it popular with spectators.

The current men's world record is 6.14 metres (20 ft, 1¾ in), held by Sergey Bubka of Ukraine, set on 30 June 1994 in Sestriere. The current women's world record is 5.01 metres (16 ft, 5¼ in), held by Yelena Isinbayeva of Russia, set on 12 August 2005 in Helsinki.

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Sequence

High schooler Chip Heuser clearing a personal best of 5.20 meters at the Texas Relays, April, 2003:

Image:Pole Vault Sequence 1.jpg	Image:Pole Vault Sequence 2.jpg	Image:Pole Vault Sequence 3.jpg
Image:Pole Vault Sequence 4.jpg	Image:Pole Vault Sequence 5.jpg	Image:Pole Vault Sequence 6.jpg

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Common Pole Vault Terminology

The following are terms commonly used in pole vault:

Bar- This is the cross bar that is suspended above the ground by the standards.

Box- A trapezoidal indentation in the ground with a metal or fiberglass covering at the end of the runway in which vaulters "plant" their pole. The back wall of the box is verticle and is approximately 1-foot in depth. The bottom of the box gradually slopes upward approximately 3-feet until it is level with the runway. The covering in the box ensures the pole will slide to the back of the box without catching on anything. The covering's lip overlaps onto the runway and ensures a smooth transition from all-weather surface so a pole being planted does not catch on the box.

Drive Knee- During the Plant phase, the knee is driven forward at the time of "takeoff" to help propell the vaulter upward.

Grip- This is where the vaulter's top hand is on the pole. As the vaulter improves his grip may move up the pole one hand's span at a time. The other hand is typically placed shoulder-width down from the top hand.

Jump Foot- This is also referred to as the take-off foot. The jump foot is the foot that the vaulter uses to leave the ground as he begins his vault.

Pits- The mats used for landing in pole vault.

Plant- See Phases of Vaulting (above) and Plant Position (below)

Plant Position- This is the position a vaulter is in the moment the pole reaches the back of the box and the vaulter begins his vault. His arms are fully extended and his drive knee begins to come up as he jumps. Typically when counting steps, a vaulter mimics this moment in time by placing his pole in the box, and extending himself as if beginning a jump. This allows the vaulter to get the position of his foot on the runway, so he can get his steps from this point.

Pole- The fiberglass equipment used to propell the vaulter up and over the bar.

Standards- The equipment that holds the bar at a particular height above the ground. Standards may be adjusted to raise and lower the bar and also to adjust the horizontal position of the bar.

Steps- Since the box is in a fixed position, vaulters must adjust their approach to ensure they are in the correct position when attempting to vault. Steps are counted back from a plant position. In order to get one's steps the vaulter makes his approach the opposite way down the runway. Steps are measured every time the jump-foot hits the ground and the number of steps needed to vault may vary from 9-12 depending on the vaulter and the height.

Swing Leg- The swing leg is also the jump foot. After a vaulter has left the ground, the leg that was last touching the ground stays extended and swings forward to help propell the vaulter upwards.

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References

IAAF rules

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Pole vault

From Free net encyclopedia

Contents

History

Modern vaulting

Sequence

Common Pole Vault Terminology

References

See also

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