Warren Moon knows exactly how Troy Aikman felt last weekend, and he never wants to know that feeling again.

Moon slammed his head on the artificial turf during a 1992 game at Pittsburgh, suffering one of the three concussions he's had playing football."I lost about 20 minutes of that game, and I still don't remember," Moon said Wednesday. "It was a very scary experience, having no control over yourself. Even when I did start remembering things, I remember feeling really cold and shivering. It was a very, very weird feeling."

The retirement of Chicago running back Merril Hoge last week and the injury to Aikman on Sunday have aroused concern about concussions, the mind-scrambling head injuries that have shortened several players' careers and left some longtime veterans forever foggy.

The list includes Hoge, Al Toon, Lynn Swann, Roger Staubach and Harry Carson.

Better padding for artificial turf and more consistent calls from officials would help alleviate some of the risk, Moon said.

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He was appalled no penalty was called when Arizona linebacker Wilber Marshall slammed his helmet into Aikman's chin. The NFL has yet to say whether it will fine Marshall.

Teams frequently warn players about the dangers of hitting with their helmets. There are at least three signs in the Minnesota Vikings locker room detailing the proper use of the helmet, including one urging players to "See what you hit."

Doctors frequently caution players about the dangers of concussions.

Moon once wrote an article for Sports Illustrated about spearing. He said the league should come down hard on plays like Marshall's hit on Aikman to let players know the tactic won't be tolerated.

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