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Pittsburgh Steelers linebacker James Harrison, it seems, is either a throwback or a relic.

Last Thursday, Harrison clocked Cleveland Browns quarterback Colt McCoy with a聽helmet-to-helmet collision that, in the not-too-distant past, might have been lauded as good, hard-hitting football.

On Tuesday, however, the National Football League gave Harrison a one-game suspension for that hit 鈥� the first suspension under new rules aimed at protecting players from "devastating" hits.

Harrison responded by planning an appeal and laughing off the suspension. "Lol!" he tweeted, later telling a reporter: "If I would have really hit him, I would have close to knocked him out."

Some former players offered support, with Deion Sanders, now a commentator for NFL Network, saying:聽鈥淐鈥檓on guys, this is football.鈥�

But the suspension is further evidence that the NFL has turned a corner and is now siding more with medical professionals than with the game's gritty past.聽

鈥淭his is consistent with the new, low-tolerance policy of the NFL alongside the growing research showing the long-term effects of concussions,鈥� says Dave Czesniuk, director of operations for Sport in Society at聽Northeastern聽University in Boston.聽

The NFL鈥檚 official statement noted that Harrison has been the league's biggest repeat offender. "In addition to four fines for illegal hits against quarterbacks in 2009 and 2010,聽Harrison聽also was fined twice for unnecessary roughness during that period.聽Harrison聽totaled six fines in that two-year period."

While Harrison has vilified Commissioner Roger Goodell over the new initiative and has vowed never to change his style, his appeals are coming up against a mounting body of medical research that points to the dangers of repeated head injuries.

鈥淔ans need to understand that these players are putting themselves at risk not only during each game, but cumulatively over time in ways that don鈥檛 necessarily show up until after retirement,鈥� says聽Ricardo Komotar, an assistant professor of clinical neurosurgery at the University of Miami in Florida.

Even past players known for their physical style have spoken about the need to protect players form head shots.

"When you definitely go for someone's head when they're not looking, I don't know if I agree with that," said former Chicago Bears linebacker Dick Butkus in an ESPN.com chat. "They're trying to make this game a little safer, and I think the QB should be protected."

Some observers聽hope the suspension will send a signal from the NFL all the way through college, high-school, and little league football.

鈥淔rom an ethical perspective,聽America聽needs to debate the cost of these kinds of injuries in both the short and long term," adds聽Brett Wilmot, an ethics professor at聽Villanova聽University in Pennsylvania. "People getting hurt and incapacitated over time for what is essentially entertainment and a pastime is not something that should be taken lightly.鈥�

Mr.聽Czesniuk of Sport in Society suggests that the suspension might have an effect.

鈥淭his has gotten a lot of attention and because I don鈥檛 think [Harrison鈥檚] intent was malicious or distasteful, the suspension will likely cause other players to tiptoe a little bit more around making similar-type hits,鈥� he says.