In the Player's Option: Combat & Tactics rule book (p27), there is mention of both Run and also Sprint actions.
A character can double his base movement by running. Running is considered a full-move action; the character can't do anything else in the same combat round that he runs. Running on a battlefield is dangerous; the character loses all Dexterity bonuses to his Armor Class and suffers a +1 AC penalty on top of that. In addition, he is considered to be charging if he runs into a square threatened by an opponent with a set spear.
A character can triple his base movement by sprinting. Like running, sprinting is a full-move action that drops the character's defenses for the round.
Other than the speed or distance covered, how is sprinting different from running? Are there no extra penalties for going even faster?
If there is nothing in 2e on this point, how do the later editions handle this?