Hurdling

Last updated
Leon Okafor of Austria runs a hurdle at a 2018 event in Linz. Leichtathletik Gala Linz 2018 men's 110m hurdles Okafor-6401.jpg
Leon Okafor of Austria runs a hurdle at a 2018 event in Linz.

Hurdling is the act of jumping over an obstacle at a high speed or in a sprint. [1] In the early 19th century, hurdlers ran at and jumped over each hurdle (sometimes known as 'burgles'), landing on both feet and checking their forward motion. Today, the dominant step patterns are the 3-step for high hurdles, 7-step for low hurdles, and 15-step for intermediate hurdles. Hurdling is a highly specialized form of obstacle racing, and is part of the sport of athletics. In hurdling events, barriers known as hurdles are set at precisely measured heights and distances. Each athlete must pass over the hurdles; [2] [3] [4] passing under or intentionally knocking over hurdles will result in disqualification.

Contents

Accidental knocking over of hurdles is not cause for disqualification, [5] but the hurdles are weighted to make doing so disadvantageous. [5] [1] In 1902 Spalding equipment company sold the Foster Patent Safety Hurdle, a wood hurdle. In 1923 some of the wood hurdles weighed 16 lb (7.3 kg) each. Hurdle design improvements were made in 1935, when they developed the L-shaped hurdle. With this shape, the athlete could hit the hurdle and it will tip down, clearing the athlete's path. The most prominent hurdles events are 110 meters hurdles for men, 100 meters hurdles for women, and 400 meters hurdles (both sexes) – these three distances are all contested at the Summer Olympics and the World Athletics Championships. The two shorter distances take place on the straight of a running track, while the 400 m version covers one whole lap of a standard oval track. Events over shorter distances are also commonly held at indoor track and field events, ranging from 50 meters hurdles upwards. Women historically competed in the 80 meters hurdles at the Olympics in the mid-20th century. Hurdles race are also part of combined events contests, including the decathlon and heptathlon. [6]

In track races, hurdles are normally 68–107 cm (27–42 in) in height, depending on the age and sex of the hurdler. [7] Events from 50 to 110 meters are technically known as high hurdles races, while longer competitions are low hurdles races. The track hurdles events are forms of sprinting competitions, although the 400 m version is less anaerobic in nature and demands athletic qualities similar to the 800 meters flat race.

A hurdling technique can also be found in the steeplechase, although in this event athletes are also permitted to step on the barrier to clear it. [5] Similarly, in cross country running athletes may hurdle over various natural obstacles, such as logs, mounds of earth, and small streams – this represents the sporting origin of the modern events. Horse racing has its own variant of hurdle racing, with similar principles. [8]

Distances

Most common hurdling distance
EventSexOlympicWorld Championship
50 m hurdles BothNoNo
55 m hurdles BothNoNo
60 m hurdles BothNo 1987–present
80 m hurdles Women 1932–1968 No
100 m hurdles Women 1972–present 1983–present
110 m hurdles Men 1896–present 1983–present
200 m hurdles Men 1900–1904 No
300 m hurdles BothNoNo
400 m hurdles Both 1900–08 & 1920–present (men)
1984–present (women)
1983–present

The standard sprint or short hurdle race is 110 meters for men and 100 meters for women. The standard number of steps to the first hurdle should be 8. The standard long hurdle race is 400 meters for both men and women. Each of these races is run over ten hurdles and they are all Olympic events. [9]

The men's 200 meters low hurdles event was on the Olympic athletics programme for the 1900 and 1904 Summer Olympics. These low hurdles events were widely participated in the early part of the 20th century, particularly in North America. However, beyond these two Olympic outings, they never gained a consistent place at international competitions and became increasingly rare after the 1960s. This 10-hurdle race continues to be run in places such as Norway. [10] [11]

Other distances are run, particularly indoors but occasionally outdoors. The sprint hurdle race indoors is usually 60 meters for both men and women, although races 55 meters or 50 meters long are sometimes run, especially in the United States. A 60-meter indoor race is run over 5 hurdles. A shorter race may occasionally have only 4 hurdles. Outdoors, a long hurdle race is sometimes shortened to 300 meters for younger participants, who run over 8 hurdles. For example, high school and middle school athletes in California, Minnesota, and Pennsylvania run the 300 meter hurdles instead of running the 400 meter hurdles, like the majority of state competitors run today. The distance the hurdles are spaced is identical to the beginning of a standard 400 meter race which would have 10 hurdles. There are also 200 meter races for middle school and younger divisions over 5 hurdles (spaced in the same position as the last 5 hurdles of a standard 400 meter race). [12]

The final of the men's 110 metre hurdles at the 1912 Summer Olympics 1912 Athletics men's 110 metre hurdles final.JPG
The final of the men's 110 metre hurdles at the 1912 Summer Olympics

Height and spacing

There are five hurdle heights on most standard hurdles. The highest position (sometimes "college high" or "open high") is used for men's sprint hurdle races (60 m, and 110 m), which are 42 inches (106.7 cm). The next highest, (sometimes "high school high" [12] ) 39 inches (99.1 cm) is used by veteran men under age 50, and younger boys. The middle position of 36 inches (91.44 cm), (sometimes "intermediate") which is used for men's long hurdle races (400 m) plus some youth and veteran age divisions. The next lower position, 33 inches (83.8 cm) is called the "women's high" [12] used for women's short hurdle races. The lowest position, called the "low hurdle" 30 inches (76.2 cm) is used for women's long hurdles plus many youth and veteran races. Some races call for 27 inches or 68.6 centimetres for youth or veteran events. [13] Hurdles that go to this position are rare and are notable by having a sixth position. [12]

A sequence of hurdling Hurdling.jpg
A sequence of hurdling

In sprint hurdle races for men, regardless of the length of the race, the first hurdle is 13.72 m (45 ft) from the starting line and the distance between hurdles is 9.14 m (30 ft). In sprint hurdle races for women, the first hurdle is 13 m (42 ft 8 in) from the starting line and the distance between hurdles is 8.5 m (27 ft 11 in). In long hurdle events, whether for men or women, the first hurdle is 45 m (147 ft 8 in) from the starting line and the distance between hurdles is 35 m (114 ft 10 in). Most races which are shorter than the standard distance (such as indoor races) are simply run over fewer hurdles but use the same distances from the starting line. [12] There are variations on hurdle height and spacing for the age groups of athletes competing. See Masters athletics (track and field) and Youth athletics. [14]

Technique

A sequence showing hurdling, from 1900. Today a distance to the first hurdle of more than 1 m is advised. Hurdling Kraenzlein.png
A sequence showing hurdling, from 1900. Today a distance to the first hurdle of more than 1 m is advised.
100 m hurdles at the 2010 Memorial Van Damme. Priscilla Lopes-Schliep, Sally Pearson, Lolo Jones and Perdita Felicien 100 m hurdles Memorial Van Damme 2010.jpg
100 m hurdles at the 2010 Memorial Van Damme. Priscilla Lopes-Schliep, Sally Pearson, Lolo Jones and Perdita Felicien
2008 Summer Olympics - Men's 110 m Hurdles - Semifinal 1 2008 Summer Olympics - Men's 110m Hurdles - Semifinal 1.jpg
2008 Summer Olympics – Men's 110 m Hurdles – Semifinal 1
Kerron Clement running the 400 m hurdles in Berlin, 2009 (at center) 400 m hurdles Kerron Clement Berlin 2009.jpg
Kerron Clement running the 400 m hurdles in Berlin, 2009 (at center)

In order to obtain the optimal hurdling technique, one must first learn the proper running techniques. It is important that the runner stays on the balls of his or her feet for the entirety of the race. This makes a fluid movement between each stage of the race.

There is a technique that is desirable to accomplish efficient hurdling action during a race. Many runners rely mainly on raw speed, but proper technique and well-planned steps leading up to and between each hurdle can allow an efficient hurdler to outrun faster opponents. Generally, the efficient hurdler spends the minimum amount of time and energy going vertically over the hurdle, thus achieving maximum speed in the horizontal race direction down the track.

When approaching the first hurdle, athletes try to avoid stutter stepping (a term used to refer to the cutting of stride length before reaching a hurdle). This cuts the runner's momentum and costs valuable time. Athletes attack the hurdle by launching at it from 6–7 feet away (depending on the runner's closing speed); the lead leg extended yet slightly bent (because a straight leg leads to more time over the hurdle) so that the heel just narrowly clears the barrier's height. After launching, the trail leg is tucked in horizontally and flat, close to the side of the hip. The objective is to minimize center-of-gravity deviation from normal sprinting and reduce time spent flying through the air.

In order to hurdle properly and not simply jump over it, a runner must adjust his or her hips to raise them over the hurdles. This involves the correct use of the lead leg, trail leg, and arm positions. The lead leg is the leg that goes over the hurdle first and should remain fairly straight. Upon crossing over the hurdle barrier, the runner's lead leg snaps down quickly landing roughly 1 metre (3 feet) beyond the hurdle. The trail leg follows the lead leg. The trail leg drives forward at the knee (not swinging, as swinging causes the trunk to straighten up), and pulls through to maintain stride length. An effective trail leg will be parallel to the top of the hurdle and will be as close to the top of the hurdle as possible. As the lead leg is being lifted over the hurdle, the opposite arm should cross the body parallel to the ground. This helps with the runner's balance and rhythm throughout the race.

In men's hurdles, it is usually necessary to straighten the leg at the top of the flight path over the hurdle, although a partial bend in the knee gains a faster push-off when the athlete hits the ground. The ability to do this depends on the runner's leg length. As soon as the foot has cleared the hurdle, the knee starts bending again to lessen the effect of a long, slow pendulum. In women's hurdles, the lead leg is usually straight and the center of gravity does not rise relative to a normal running stride. Another way to view it is the “foot-path”: "shortest path up and the shortest path down". The opposite arm reaches farther forward and the elbow travels out to the side and then behind to make room for the trailing leg. The trailing leg also leads with the knee, but the foot and knee are horizontal, tucked up as tight as possible into the armpit.

As soon as the lead leg begins its descent, a strong downward push is exerted to enable the trailing leg's knee to come up under the armpit and in front of the chest. This enables the recovery of some of the energy expended in the flight. As the lead leg touches down to the ground, it is critical that the runner remains in a sprint. As soon as his or her lead leg touches down, the trail leg arm drives the rest of the body forward.

In the 100 and 110-meter hurdle events, the fastest hurdlers use the three-step technique. This means that three large steps are taken in between all of the hurdles. In order to do this efficiently, hurdlers must take long strides and maintain their speed for the entire race. If a hurdler begins to slow down while three-stepping, they may not be able to make it through all of the hurdles and may have to switch to a four-stepping or five-stepping technique. When three- or five-stepping, a hurdler will use the same lead leg for all of the hurdles. If a hurdler four steps, they will have to switch lead legs at each hurdle.

A modern hurdle will fall over if a runner hits it. There is no penalty for hitting a hurdle (provided this is not judged deliberate). The misconception is based on old rules before the hurdles were weighted. In the 1932 Olympics, Bob Tisdall famously won the Olympic gold medal in the 400-meter hurdles in World Record time, but was not credited with the record due to knocking over a hurdle. There can be a disqualification if a hurdler knocks a hurdle into an opponent's lane and it is judged to have interfered with the opponent's ability to run the race. There are now specifications for the tipping weight of a hurdle (the weights need to be adjusted to correspond with the height of the hurdle) so hitting a hurdle theoretically slows down the rhythm of the hurdler. However, pushing the hurdle with one's hands or running out of one's lane as a result of hitting the hurdle is cause for disqualification. While hitting hurdles is not generally considered desirable, a few sprint hurdlers have succeeded despite knocking over many hurdles. Contact with hurdles can decrease speed and also result in disruption of a hurdler's technique. Some coaches suggest if you lightly "kiss" the hurdle with the side of the leg closest to the hurdle, it can help with the runner's speed by keeping the runner closer to the ground. [9]

Variants

There are also shuttle hurdle relay races, although they are rarely run. They are usually only found at track meets that consist entirely of relay races. In a shuttle hurdle relay, each of four hurdlers on a team runs the opposite direction from the preceding runner. The standard races correspond to the standard sprint hurdle races: 4 × 110 m for men and 4 × 100 m for women. [15]

The shuttle hurdle relay has a maximum of only 4 teams, since most tracks only have 8 lanes. Two lanes will be taken up by one team. The #1 and #3 runners on the team will run in one direction down one specific lane and the #2 and #4 runners will run in the opposite direction in the other lane. The runners on each team go in sequence from 1 to 4.

Instead of using batons, the runners waiting for their teammate to finish must wait until their teammate gets to a certain point to begin their part of the race. There will be an official looking to see if they take off too early. If they do so, then they will be disqualified; if they take off late then it will just hurt their time and chances of winning the event.

In the United States, the men's team of Aries Merritt, Jason Richardson, Aleec Harris, and David Oliver, set the world record in the 440m shuttle hurdle relay race at a time of 52.94 seconds (set on April 25, 2015). [16] On the women's side, Brianna Rollins, Dawn Harper-Nelson, Queen Harrison, Kristi Castlin, together ran a 400m shuttle hurdle race at a world record time of 50.50 seconds on August 24, 2015. [16]

Shuttle hurdle relay was introduced at the 2019 IAAF World Relays, it consist of a race in which two men and two women on each team are running a 110 m hurdles. [17]

See also

Related Research Articles

<span class="mw-page-title-main">Irina Privalova</span> Russian athlete (born 1968)

Irina Anatolyevna Privalova is a Russian Olympic gold medallist athlete. Her Summer Olympics debut was in 1992 in the sprint events, where she won two medals— a bronze in the 100 m and running the anchor leg in the 4x100 team, a silver — and came fourth in the 200, representing the Unified Team. With three European individual championships and three individual world medals, Irina Privalova had been a formidable competitor during most of the 1990s but had not yet won an outdoor international event gold medal.

<span class="mw-page-title-main">Sprint (running)</span> Running over a short distance in a limited period of time

Sprinting is running over a short distance at the top-most speed of the body in a limited period of time. It is used in many sports that incorporate running, typically as a way of quickly reaching a target or goal, or avoiding or catching an opponent. Human physiology dictates that a runner's near-top speed cannot be maintained for more than 30–35 seconds due to the depletion of phosphocreatine stores in muscles, and perhaps secondarily to excessive metabolic acidosis as a result of anaerobic glycolysis.

Middle-distance running events are track races longer than sprints, ranging from 500 metres up to two miles. The standard middle distances are the 800 metres, 1500 metres and mile run, although the 3000 metres may also be classified as a middle-distance event. The 1500 m came about as a result of running 3+34 laps of a 400 m outdoor track or 7+12 laps of a 200 m indoor track, which were commonplace in continental Europe in the 20th century.

<span class="mw-page-title-main">Relay race</span> Team sport in athletics, swimming, etc

A relay race is a racing competition where members of a team take turns completing parts of racecourse or performing a certain action. Relay races take the form of professional races and amateur games. Relay races are common in running, orienteering, swimming, cross-country skiing, biathlon, or ice skating. In the Olympic Games, there are several types of relay races that are part of track and field, each consisting of a set number of stages (legs), each leg run by different members of a team. The runner finishing one leg is usually required to pass the next runner a stick-like object known as a "baton" while both are running in a marked exchange zone. In most relays, team members cover equal distances: Olympic events for both men and women are the 400-metre and 1,600-metre relays. Some non-Olympic relays are held at distances of 800 m, 3,200 m, and 6,000 m. In the less frequently run medley relays, however, the athletes cover different distances in a prescribed order—as in a sprint medley of 200, 200, 400, 800 metres or a distance medley of 1,200, 400, 800, 1,600 metres.

<span class="mw-page-title-main">Track and field</span> Sports based on running, jumping or throwing

Track and field is a sport that includes athletic contests based on running, jumping, and throwing skills. The name used in North America is derived from where the sport takes place, a running track and a grass field for the throwing and some of the jumping events. Track and field is categorized under the umbrella sport of athletics, which also includes road running, cross country running and racewalking. In British English the term athletics is synonymous with American track and field and includes all jumping events. Outside of Canada and the United States, athletics is the official term for this sport with 'track' and 'field' events being subgroups of athletics events.

<span class="mw-page-title-main">400 metres hurdles</span> Track and field hurdling event

The 400 metres hurdles is a track and field hurdling event. The event has been on the Olympic athletics programme since 1900 for men and since 1984 for women.

<span class="mw-page-title-main">400 metres</span> Sprint running event

The 400 metres, or 400-meter dash, is a sprint event in track and field competitions. It has been featured in the athletics programme at the Summer Olympics since 1896 for men and since 1964 for women. On a standard outdoor running track, it is one lap around the track. Runners start in staggered positions and race in separate lanes for the entire course. In many countries, athletes previously competed in the 440-yard dash (402.336 m)—which is a quarter of a mile and was referred to as the "quarter-mile"—instead of the 400 m (437.445 yards), though this distance is now obsolete.

<span class="mw-page-title-main">Darvis Patton</span> American sprinter

Darvis "Doc" Darell Patton is a retired American track and field athlete who competed in sprinting events. He is a two-time US Champion in the 200-meter dash and won the silver medal in the event at the 2003 World Championships. He is a three-time Olympian and a four-time participant at the World Athletics Championships.

<span class="mw-page-title-main">Allyson Felix</span> American track and field athlete (born 1985)

Allyson Michelle Felix is a retired American track and field athlete who competed in the 100 meters, 200 meters and 400 meters. She specialized in the 200 meters from 2003 to 2013, then gradually shifted to the 400 meters later in her career. At 200 meters, Felix is the 2012 Olympic champion, a three-time world champion (2005–2009), a two-time Olympic silver medalist, and the 2011 world bronze medalist. At 400 meters, she is the 2015 world champion, 2011 world silver medalist, 2016 Olympic silver medalist, 2017 world bronze medalist, and 2020 Olympic bronze medalist. Across the short distances, Felix is a ten-time U.S. national champion.

<span class="mw-page-title-main">110 metres hurdles</span> Track and field hurdling event

The 110 metres hurdles, or 110-metre hurdles, is a hurdling track and field event for men. It is included in the athletics programme at the Summer Olympic Games. The female counterpart is the 100 metres hurdles. As part of a racing event, ten hurdles of 42 inches (106.7 cm) in height are evenly spaced along a straight course of 110 metres. They are positioned so that they will fall over if bumped into by the runner. Fallen hurdles do not carry a fixed time penalty for the runners, but they have a significant pull-over weight which slows down the run. Like the 100 metres sprint, the 110 metres hurdles begins in the starting blocks.

<span class="mw-page-title-main">Penn Relays</span> American track and field competition

The Penn Relays is the oldest and largest track and field competition in the United States, hosted annually since April 21, 1895 by the University of Pennsylvania at Franklin Field in Philadelphia. In 2012, there were 116 events run at the meet. More athletes run in the Penn Relays than at any other track and field meet in the world. It regularly attracts more than 15,000 participants from high schools, colleges, and track clubs throughout North America and abroad, notably Jamaica, competing in more than 300 events over five days. Historically, the event has been credited with popularizing the running of relay races. It is held during the last full week in April, ending on the last Saturday in April. Attendance typically tops 100,000 over the final three days, and has been known to surpass 50,000 on Saturday. The Penn Relays also holds a Catholic Youth Organization night for Catholic Middle Schools in the Archdiocese of Philadelphia. Preliminaries are run on the Tuesday during the Carnival Week, and the Finals are run on Friday.

<span class="mw-page-title-main">Distance medley relay</span> Athletic event in which four athletes compete as part of a relay

The distance medley relay (DMR) is an athletic event in which four athletes compete as part of a relay. With its inclusion in the IAAF World Relays program, the IAAF announced on May 1, 2015 that the event would be an official world record event.

The sprint medley relay (SMR) is a track and field event in which teams of four athletes compete over sprinting distances as part of a relay race. Unlike most track relays, each member of the team runs a different distance. The sprint medley is rather uncommon, run most frequently at non-championship track meets which are focused on relays. Since these are not championship events, specific criteria for the event are not in common rulebooks. This leads to localized variations.

Willie James Smith III was an American athlete who was the national champion 400 metres runner in 1979-80, and a gold medal winner at the 1984 Olympics in the 4 × 400 m relay.

<span class="mw-page-title-main">World Athletics Relays</span> International biennial track and field sporting event

The World Athletics Relays, known as the IAAF World Relays until 2019, is an international biennial track and field sporting event held by World Athletics where teams from around the world compete in relay races, some of which are not part of the standard Olympic programme. The first three editions were set to take place in Nassau, Bahamas at the Thomas Robinson Stadium in 2014, 2015 and 2017. Originally intended as an annual event, it was later decided to happen every odd year, the same as the World Athletics Championships for which it serves as a qualification stage.

<span class="mw-page-title-main">NCAA Division I Women's Outdoor Track and Field Championships</span> Annual collegiate track and field competitions

The NCAA Division I Women's Outdoor Track and Field Championships are the annual collegiate track and field competitions for women athletes representing Division I institutions organised by the National Collegiate Athletic Association (NCAA). Athletes' performances in individual championships earn points for their institutions and the team with the most points receives the NCAA team title in track and field. A separate NCAA Division I men's competition is also held. These two events are separate from the NCAA Division I Women's Indoor Track and Field Championships and NCAA Division I Men's Indoor Track and Field Championships held during the winter. The first edition of the championship was held in 1982.

<span class="mw-page-title-main">Dalilah Muhammad</span> American hurdler (born 1990)

Dalilah Muhammad is an American track and field athlete who specializes in the 400 meters hurdles. She is the 2016 Rio Olympics champion and 2020 Tokyo Olympics silver medalist, becoming at the latter the then-second-fastest woman of all time in the event with her personal best of 51.58 seconds. Muhammad was second at both the 2013 and 2017 World Championships to take her first gold in 2019, setting the former world record of 52.16 s. She was the second female 400 m hurdler in history, after Sally Gunnell, to have won the Olympic, World titles and broken the world record. At both the 2019 World Championships and Tokyo Games, she also took gold as part of women's 4 × 400 metres relay team.

<span class="mw-page-title-main">2019 World Athletics Championships – Women's 4 × 400 metres relay</span>

The women's 4 × 400 metres relay at the 2019 World Athletics Championships was held at the Khalifa International Stadium in Doha, Qatar, from 5 to 6 October 2019. In the final the Jamaican team were initially disqualified, but were reinstated as the bronze medallists upon appeal.

Shuttle hurdle relay (SHR) is a type of a relay race in track and field in which participants jump (sprint) over hurdles. The shuttle hurdle relay is contested at the Drake Relays, Desert Conference Relays, Kansas Relays, Mt. SAC Relays, Penn Relays, Texas Relays, Akron Relays, Alabama Relay, Appalachian Conference Relay, Florida Relays (Gainesville), Knoxville Relay, Long Beach Relay, Ohio Relays, Santa Barbara Relay, So Cal Relays, Tennessee Relays, Towson Relays, and Tri-State Relays. The SHR was also included at the 2019 IAAF World Relays and 2021 competition.

References

  1. 1 2 "hurdling | athletics". Encyclopedia Britannica. Retrieved 2017-02-01.
  2. McDonald, Craig (2004). "Hurdling Is Not Sprinting". In Jarver, Jess (ed.). The Hurdles, Contemporary Theory, Technique and Training. Track & Field News. pp. 12–52. ISBN   978-0-911521-67-2.
  3. Longden, Bruce (2004). "Towards Better Hurdling". In Jarver, Jess (ed.). The Hurdles, Contemporary Theory, Technique and Training. Track & Field News. pp. 52–55. ISBN   978-0911521672.
  4. "Competition Rules 2012–2013" (PDF). International Association of Athletics Federations. pp. 161–162. Archived from the original (PDF) on 2020-09-17. Retrieved 2019-12-22.
  5. 1 2 3 "Competition Rules 2012–2013" (PDF). International Association of Athletics Federations. pp. 161–162. Archived from the original (PDF) on 2020-09-17. Retrieved 2019-12-22.
  6. "Competition Rules 2012–2013" (PDF). International Association of Athletics Federations. p. 214. Archived from the original (PDF) on 2020-09-17. Retrieved 2019-12-22.
  7. Jarver, Jess (2004). The Hurdles, Contemporary Theory, Technique and Training. Track & Field News. pp. 9, 63. ISBN   978-0911521672.
  8. "Horse Racing Victoria" (PDF). racingvictoria.net.au. Retrieved December 8, 2013.
  9. 1 2 "IAAF Rulebook" (PDF). iaaf.org. Archived from the original (PDF) on 2011-10-11.
  10. "Friidrett for barn og ungdom" (PDF). Norsk Friidrett. Archived from the original (PDF) on December 6, 2013. Retrieved December 3, 2013.
  11. "Hekkeøvelser og hekkeavstander" (PDF). Norsk friidrett. Archived from the original (PDF) on December 6, 2013. Retrieved December 3, 2013.
  12. 1 2 3 4 5 "Trackinfo Hurdles 101". trackinfo.org.
  13. "Regeländringar tävlingssäsongen 2014". Svensk Friidrott. Archived from the original on April 13, 2021. Retrieved December 3, 2013.
  14. The specifications for those variations are enumerated in the rule amendments for those divisions and are explained on this website.
  15. "Masters Shuttle Hurdles specifications" (PDF). woodhurdles.com. Archived from the original (PDF) on 2016-03-03. Retrieved 2009-12-18.
  16. 1 2 "USATF – Statistics – Records". usatf.org. Archived from the original on 2021-10-24. Retrieved 2017-09-27.
  17. "TWO NEW EVENTS ADDED TO IAAF WORLD RELAYS PROGRAMME". iaaf.org. Retrieved 12 May 2019.