įor example, Jacoby Ford, who ran 4.28 s in the 2010 NFL Combine, had a collegiate best of 6.51 s in the 60-meter dash (outside the top-40 of the all-time lists). This aspect means that comparisons with track times are essentially impossible given that a reaction time is not factored in, and the use of hand-timing in the 40-yard dash can considerably alter a runner's time: the methods are not comparable to the rigorous electronic timing used in track and field. In contrast, track and field races have the runner react to a starting gun, which takes approximately 0.24 second (based on FAT timing) further to this, IAAF rules state any runner with a reaction time of less than 0.1 second is subject to disqualification. For purposes of measurement at the Combine, the run is made along the lower sideline from the 40 yard-line to the end zone, which has built-in rundown space, and for electronically timed 40-yard dashes, the runner is allowed to start when they wish, and a timer hand-starts the clock. started by hand, stopped electronically) at the NFL Scouting Combine until 1999. The National Football League (NFL) did not begin using partial electronic timing (i.e. A laser start (from a stationary position) is more accurate for measuring pure speed as it does not register a runner's reaction time, however, this method of timing a 40-yard dash can affect the accuracy by as much as 0.5 seconds with the manual stopwatch method. In terms of judging a person's speed, the best method of timing is through lasers which start and stop the times when passed through. Punts average around 40 yards in distance from the line of scrimmage, and the hangtime (time of flight) averages approximately 4.5 seconds therefore, if a player can run 40 yards in 4.5 seconds, they will be able to leave the line of scrimmage when a punt is kicked, and reach the point where the ball comes down just as it arrives. The origin of timing football players for 40 yards comes from the average distance of a punt and the time it takes to reach that distance. The 40-yard dash is not an official race in track and field athletics, and is not an IAAF-recognized race. This was traditionally only true for the "skill" positions such as running back, wide receiver, and defensive back, although now a fast 40-yard dash time is considered important for almost every position. A player's recorded time can have a heavy impact on his prospects in college or professional football. It is primarily run to evaluate the speed and acceleration of American football players by scouts, particularly for the NFL Draft but also for collegiate recruiting. The 40-yard dash is a sprint covering 40 yards (36.576 m).
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