starter position and fat final - atom officialsposition+and+fat+final.pdf · -a 100 meter sprinter...
TRANSCRIPT
A Scientific Approach
Starter Position & FAT
Slide Show designed by the Illinois Track & Cross Country
Officials Association
1893 First State Track MeetUniversity of Illinois
1906 Olympics (Athens)Start of the 100 Yard Dash
May 10, 1930
Southern Pacific AAU Meet
Finish of the 100 yard dash.
Frank Wycoff finishing with a world record time in the 100 yard dash… 9 2/5 seconds… at the Southern Pacific AAU meet. (Not recognized by the International Union because he used starting blocks.) Matched the time without using blocks one month later at Stagg Field in Chicago. World record recognized.
Then a few technological advances later…
Does fully automatic timing now guarantee fair
timing?
Nope(And it’s mostly due to the Starter!)
Factors in AthleteReaction Times
(D) The time for sound to cross the distance between the starter and the competitor.
(A) The time for the auditory signal to be recognized by the competitor and a reaction sent to the muscles.
(G) Time shaved off when a competitor anticipates (guesses) the start.
Reaction Time = (D) + (A) – (G)
G
Guessing.
The one false start disqualification in high school and the starter intentionally varying the interval between “set” and the gun both serve to discourage guessing.
Unfortunately some still choose to play the guessing game.
Reaction Time = (D) + (A) – (0.000s)
While (G) is totally unpredictable, ideally it should be zero for any competitor reacting to the gun and not guessing.
A
Auditory signal.
Auditory Signal A study released in 2008 by the University of Alberta in Edmonton indicates the loudness of a sound has an effect on reaction time.
People hearing a 120 decibel signal reacted on average 0.018 seconds sooner than those hearing an 80 decibel signal.
So, what about (A), eh?
Frei Universitat Berlin determined in 1998 that nearly all weapons used to start races in track generate a 160 decibel sound 1 meter from the gun.
Even at 150 feet, starter’s gun is six times louder than the strongest sound tested in the Canadian study.
Do other factors make a difference, even in a “normal” starting line environment?
Maybe…
Questions.
…it matters where youare in a crowd.
Spanish startle reflex experiments done prior to the Barcelona Olympics showed (A) values as small as 0.030 seconds.
Probably not relevant since competitors expect the gun.
Questions.
The IAAF uses 0.100 second reaction time as measured in starting block pressure-plates to identify false starts.
Questions.
(A) is flexible but on average is 0.120 second due to inconsistent recognition of gun versus background noise.
Questions.
Reaction Time = (D) + (0.120s) – (0.000s)
D
Distance to starter.
D1D2
ΔD
ΔD = 0.019 secondAll loud gun starts are unavoidably unfair, both within and between heats.
Questions.
The average speed for sound is 1,125 feet/second.
(D) = distance to starter / 1,125 feet/second
Silent Gun Start World Championships
ΔD = 0.000 sec
Questions.
Loud Gun Start IHSA Championships
(really loud gun)
Questions.
STAGGERED LANE STARTS (CON’T)◦ STARTER WITH TWO ASSISTANTS
◦ THE STARTER WILL TAKE A POSITION ON THE INFIELD MIDWAY BETWEEN THE INSIDE RUNNER AND THE OUTSIDE RUNNER.
◦ THE ASSISTANTS WILL BE IN A POSITION OPPOSITE THE STARTER IN OR NEAR THE OUTSIDE LANE AND WITHIN THE STARTERS LINE OF VISION.
◦ FOR RACES WITH 1-2 TURN STAGGERS, THE FIRST ASSISTANT WILL WATCH THE INSIDE THREE LANES, THE SECOND ASSISTANT WILL WATCH THE MIDDLE THREE LANES, AND THE STARTER WILL WATCH THE OUTSIDE
Questions.
Current Position (Figure 5): “(The starter will) take a position, 8-20 feet from the starting line, on the inside
of the track. Make sure you have a line of vision that includes the entire starting line…. The second assistant will signal the first assistant (when) ready and then the first assistant will signal the starter to give the set command.”
“The first assistant should be in a position on the opposite side of the track from the starter… (and) should be in a position on the line…. The first assistant will be responsible for the outside lanes (5-8).”
“The second assistant should be on the infield positioned on the line, opposite the first assistant. The second assistant will be responsible for the inside lanes.”
S R2
R1
Advised Position (Figure 7): “The starter takes a position, 12 meters from the starting line, on the inside of
the track. The starter will be responsible for Lanes 4-9. The second assistant will signal the first assistant when ready and then the first assistant will signal the starter to give the set command.”
“The second assistant should be in a position on the opposite side of the track from the starter. The second assistant will be responsible for Lanes 1-6.”
“The first assistant should be positioned on the line outside the track. The first assistant will be responsible for the viewing all lanes from behind.”
S
R1R2
Rationale for Modification: Moving the starter farther down the track reduces the FAT difference for the field from 0.026 seconds to 0.013 seconds. All competitors cannot fit into the starter’s central vision. Assistant starter 2 is moved outside and the two officials split the field. Assistant starter 1 is away from the track and in line with the back of the field to see early motion/slippage for all lanes. Assistant starter 1 is also located in the starter’s central vision.
Figure 8 Figure 9
Figure 7
Figure 7
Questions.
Lane 9112 feet from starter.D = 0.10 seconds
Lane 340 feet from starter.D = 0.03 seconds
Starter PositionOn goal line across from Lane 3 competitor, approximately 30 feet from track.
IHSA State Finals2008 – Boys Class A4x100 Relay
Questions.
IHSA State Finals2008 – Boys Class A4x100 Relay
Place Team Official FinishTime
ΔD Adjusted FinishTime
AdjustedPlace
1st Lane 5 42.91 0.02 42.89 1st
2nd Lane 6 43.43 0.04 43.39 2nd
3rd Lane 4 43.72 0.01 43.71 4th
4th Lane 7 43.73 0.05 43.68 3rd
5th Lane 9 43.96 0.07 43.89 5th
6th Lane 1 44.04 0.02 44.02 7th
7th Lane 3 44.07 0.00 44.07 8th
8th Lane 8 44.08 0.06 44.02 6th
DNF Lane 2 0.01
Questions.
If we adjust the starter’s position, where’s the best place?
?
Questions.
Starter PositionSomewhere along the extended Lane 5 starting line.
Goal: To minimize ΔD.
Questions.
(D) values with Starter on Lane 5 starting line extended.
Questions.
(D) values with starter along Lane 5 extended.
ΔD
Questions.
Plotting the maximum ΔD for each starter position.
Questions.
Starter Position87 feet from the track, along extended Lane 5 starting line.
These larger D’s generate slower FAT marks across the field but serve to minimize ΔD.
Questions.
IHSA State Finals MODIFIED2008 – Boys Class A STARTER4x100 Relay POSITION
AdjustedPlace
Team Adjusted FinishTime
ΔD Finish Time Modified
ModifiedPlace
1st Lane 5 42.89 0.00 42.89 1st
2nd Lane 6 43.39 +0.01 43.40 2nd
3rd Lane 7 43.68 +0.01 43.69 3rd
4th Lane 4 43.71 0.00 43.71 4th
5th Lane 9 43.89 +0.02 43.91 5th
6th Lane 8 44.02 +0.01 44.03 6th
7th Lane 1 44.02 +0.01 44.03 7th
8th Lane 3 44.07 +0.00 44.07 8th
DNF Lane 2 +0.01
Questions.
Is the impact of starter position on FAT results worth worrying about?
Yes, especially in some events.
Questions.
IHSA Boys Qualifying Heats IHSA Girls Qualifying Heats 2003 – 2008 State Meets 2003 – 2008 State Meets
Event Avg. Time to1st Non
-Qualifier(seconds)
Range in “D”from Starter
(seconds)
EntriesPotentially
Affected
Event Avg. Time to1st Non
-Qualifier(seconds)
Range in“D” from
Starter (seconds)
EntriesPotentially
Affected
4x800 0.36 0.03 3 4x800 1.13 0.03 4
4x100 0.07 0.06 20 4x100 0.08 0.06 16
3200 NQ 0.03 - 3200 NQ 0.03 -
110Hurdles
0.07 0.02 12 100Hurdles
0.06 0.02 17
100 0.01 0.02 37 100 0.03 0.02 26
800 0.18 0.03 9 800 0.29 0.03 6
4x200 0.14 0.06 11 4x200 0.27 0.06 7
400 0.07 0.06 22 400 0.23 0.06 10
300Hurdles
0.11 0.03 8 300Hurdles
0.22 0.03 11
1600 0.37 0.03 3 1600 0.80 0.03 2
200 0.03 0.03 23 200 0.06 0.03 18
4x400 0.24 0.05 6 4x400 0.62 0.05 5
Nearly 300 entries in the past six years may have had their fates determined by where the starter stood for their event.
Questions.
We don’t let this happen…
Questions.
…but based on current practice,
- we give the equivalent of a 19-inch advantage to a 50 second quarter miler in Lane 3 over one with equal talent in Lane 9.
- a 100 meter sprinter closest to the starter has the opportunity to move forward nearly a foot before the most distant competitor even has the chance to react to the gun.
- a half-miler in a center alley has a heel on the starting line advantage over middle distance runners in alleys at the edges of the track.
Questions.
Similar care needs to be taken in positioning recall starters.
It all has to do withwhat you can see!
Questions.
It is the macula that is used to read, drive, and recognize faces.
Questions.
We want starters positioned so that all of their assigned competitors are in the central vision.
Central Vision 30o wide
Peripheral VisionPeripheral Vision
Questions.
At arm’s length, two hands held side by side have an angular size of about 30 degrees (central vision range).
Questions.
Positioning Assistant Starters1st Priority - Officials make calls on violations in their central vision field.
2nd Priority - The optimal view of a competitor’s start is an unobstructed profile or frontal oblique view.
3rd Priority - If a profile view is not practical, a straight on frontal view of a competitor is preferable to any view from
behind.
4th Priority - No panning of central vision is necessary for any official to observe their assigned competitors.
Questions.
STAGGERED LANE STARTS (CON’T)◦ STARTER WITH TWO ASSISTANTS
◦ THE STARTER WILL TAKE A POSITION ON THE INFIELD MIDWAY BETWEEN THE INSIDE RUNNER AND THE OUTSIDE RUNNER.
◦ THE ASSISTANTS WILL BE IN A POSITION OPPOSITE THE STARTER IN OR NEAR THE OUTSIDE LANE AND WITHIN THE STARTERS LINE OF VISION.
◦ FOR RACES WITH 1-2 TURN STAGGERS, THE FIRST ASSISTANT WILL WATCH THE INSIDE THREE LANES, THE SECOND ASSISTANT WILL WATCH THE MIDDLE THREE LANES, AND THE STARTER WILL WATCH THE OUTSIDE THREE LANES FOR FAIR STARTS, RECALL, AND BLOCK
Questions.
Questions.
S
R2
R1
Wrong - Two Turn StaggerPresent Positioning
Questions.
Correct - Two Turn StaggerModified Positioning
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R2
R1
Questions.
Fans expect fair competition.
Questions.
So far as it is possible within the limitations of loud gun starts, we as track and field officials should strive to provide it!
Questions.