I read somewhere....and no, I can't remember where so this is anecdotal.....that the injury rate between HUNH teams and slower-paced offenses is about the same, but the difference is in who gets injured. With HUNH offenses, skill position players are hurt more frequently, and with slobberknockin' offenses, it's the interior linemen....
That might be true, but only if the HUNH offense was passing oriented , etc, while the standard speed offense was pounding the ball inside. What if you ran HUNH, running the ball? What if you ran a passing offense, but with huddles? It seems to me that the style of the offense and the speed of the offense are not necessarily dependent on one another.
It also seems certain that more plays means more chances to get hurt, plus tired players would seem likely to lead to a higher incidence of injury. Since many injuries occur in non-game situations (lifting, practice, etc), the increase would not be linear, however. Thus, if one team ran 60 plays a game, and another ran 80 plays a game, I would expect that the math would work out something like:
If 60% of injuries occur in games, then the 33% more plays would mean .4+.6*1.33=1.2, so 20% more injuries.