'69 New York Jets Continue Their Winning Ways

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In response, NFL Players Association chief Gene Upshaw has asked Congress to help with legislation that could reform the organization's pension and disability system.

According to Schwenk, much of the older players' anger may be justified.

"When they feel like they have just been used up and thrown away, I think it leads to significant health consequences," he said.

Nicholas agreed. He said that while the '69 Jets have fared relatively well over the years, many of their peers have not.

"A lot of these old ball players are responsible for what the game is today," Nicholas said. "And to see some of these people not cared for? Obviously, as a human being, you want to see that changed."

More information

For more on sports injuries, visit the U.S. National Library of Medicine.