Responding to Criticism, N.F.L. Says Helmet Rule Will Not Change

Shamarko Thomas of the Indianapolis Colts was ejected for an illegal hit on David Moore of the Seattle Seahawks on Aug. 9.The N.F.L. reaffirmed on Wednesday that there would be no going back on the league’s reworked rule for use of a helmet to initiate contact. The players, many of whom have been less than thrilled with the change, will simply have to adjust.

The altered rule, which forbids players from lowering their head before contact with another player, has been met with intense criticism from players, coaches and the news media. Some, including Richard Sherman, a cornerback for the San Francisco 49ers, have indicated that the rule could have drastic effects on the future of the game if…