Passing plays resulted in more concussions than any other type of play based on a video review of more than 450 head injuries suffered over the last two NFL seasons.
On Thursday, Barry Wilner of the Associated Press noted the study overseen by NFL Engineering Committee chairman Dr. Jeff Crandall found 44 percent of concussions came on passes. The next highest was running plays at 30 percent.
"We've seen a shift," Crandall said. "Fifteen to 20 years ago we would have found a much higher relative percentage of helmet to helmet, as much 70 percent.