['Hamas' Jenkins]

Originally Posted by Chiefnj2

40 Yard Dash
February 2, 2010 in: 40 yard dash
The Truth About Speed, NFL Combines and the 40 Yard Dash!


Two coaches that I respect greatly, Mike Boyle & Nick Tumminello, wrote this great article on 40 yard dash speed times. Enjoy!

The Truth About Speed, NFL Combines and the 40 Yard Dash!
By: Mike Boyle & Nick Tumminello at nicktumminello.com

Speed is the stuff of urban legend. Deion Sanders supposedly showed up at the NFL Combine, ran a 4.2 and went home. We routinely hear of high school kids who purportedly run 4.3’s and 4.4’s. The stories of “reported” speed have gotten out of control. This would not be a problem in and of itself. Most of us could look at it and say “so what” people lie or people embellish. The real problem is that the lies seem to be setting the standard. One of the reasons that I no longer train athletes for the NFL Combine is the unrealistic expectations of athletes and agents based on these “urban legends” or the occasional freakish performance like Vernon Davis this year.
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1- Electronic start- electronic finish. This should be the standard but, unfortunately is not. The start is done with a touch pad and the finish with a photocell. This is the most accurate and as a result yields the slowest times. An electronic start/ electronic finish time has been shown to be .22 seconds slower than a hand held 40 yard dash. ( Brown, 2004)
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2- Hand Start- electronic finish. This is a system used uniquely at the NFL Combine. A hand start-electronic finish will be approximately .1 seconds slower than a hand held 40 yard dash. In the combine the use of hand start will be particularly evident in the faster ten yard dash times. Athletes will run 10 yard times much closer to a hand held but, times at each following split will be closer to the electronic time.
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3- Hand Start- hand finish- this is the fastest and least accurate. Handheld times tend to be faster but are clearly more prone to human error. Many of the legendary times I believe were hand-held timing combined with human error or human expectation.
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At the NFL Combine in 1996, 97, 98, 2001 and 2003 and 2006 no one ran a 4.2. No one. Not one person. In 2001 Ladainian Tomlinson ran one 4.36, five in the 4.4’s and vertical jumped 40.5. 2003 was a fast year, yet still produced no 4.2’s. Ten athletes ran 4.3’s in 2003. The heaviest was a 223 pound running back. The Combine track is always said to be slow but the truth is it is simply accurate. All of these supposed fast times seem to be run at times when no independent verification is available. Seems a bit curious doesn’t it.
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Here’s another angle on the whole “speed” thing. Ben Johnson and Carl Lewis ran split times of 4.67 for 40 meters ( Bryan, Rose-Hulman) The split times are below.
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1.84 10 yd
2.86 20 (1.02 split)
3.8 30 (.94 split)
4.67 40 (.87 split)
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40 meters is 43.74 yards. This would make the distance approximately ten percent further. This means we could reduce the time by approximately .36 seconds to account for the additional 3.7 yards. This would mean that in constant acceleration mode the best sprinters in the history of the world, using blocks, ran 4.31 for 40 yards. Does it seem plausible that high school football players can run faster times without blocks.

Consistency in methodology is key.