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Riddell stopped selling the VSR-4 in 2010. The Revolution models include significant changes from the VSR-4, such as covering the jaw area and having padding there, as well as adding padding to increase the space between the head and the shell.

The Virginia Tech ratings “show that there is a difference between helmet brands and models and that strong research and development can make a significant impact on the protective performance of football helmets,” Arment said in an emailed statement.

Duma wants to run the same sort of testing on baseball and cycling helmets.

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Online: http://www.sbes.vt.edu.

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Howard Fendrich can be reached at http://twitter.com/HowardFendrich