The NCAA Men's Basketball Rules Committee today adopted use of the 45-second shot clock, increased the penalty for intentional fouls in the act of shooting and decided to experiment with a three-point shot from 19 feet 9 inches next season.

Ed Steitz, the NCAA rules editor, said he expects "quite a few" conferences to ask the committee for permission to use the three-point shot next season. Three conferences, including the Atlantic 10, used the three-point shot this season. Steitz said he hopes major conferences such as the Big East will be among those that seek to use a three-point shot.

The 13-member rules committee, meeting at the Radisson Hotel here, voted down all proposals designed to curb intentional fouling by the trailing team late in the game and to widen the foul lane to minimize rough low-post play.

However, as one of its points of emphasis, the rules committee will instruct officials to call intentional fouls more diligently next season, thus awarding two shots for the infraction, instead of the customary one and one, according to Steitz, also the athletic director at Springfield College.

Approval of the 45-second clock came as no surprise, and it will be used in the 1986 NCAA tournament. Twenty-five conferences used the clock this season.

"There are some who believe it has to be a package deal," Steitz said of the shot clock and three-point shot. "There are those who believe it will minimize rough low-post play, and it's going to bring more outside shooting back into the game."

Steitz noted that the trend in basketball is toward a three-point shot, since the National High School Federation and the International Olympic Committee recently approved it.

Steitz said data thus far indicates that the use of a three-point shot improves team discipline because "kids become more and more aware of what their range is."

The increased penalty on an intentional foul in the act of shooting will allow the offended team to retain possession following the free throws.

The committee discussed a number of proposals that would more severely penalize teams that try to "foul for profit" in the final minutes of a game.

"You've got to appreciate the value of a possession," Steitz said, citing committee research. "Awarding two free throws is worth 1.4 points, but awarding two free throws and possession is worth 2.4 points."

The committee also voted down proposals to adopt both the wider trapezoidal lane used in international play and the wider rectangular lane used by the National Basketball Association.

In other rules changes, undershirts with any logo or insignia now are prohibited (previously they could be worn but a technical foul was assessed); assistant coaches, players and other bench personnel except the head coach are no longer allowed to stand during play, except for spontaneous reaction to an outstanding play, and the jurisdiction of officials ends when they leave the court. The last change is designed to avoid a repeat of the West Virginia-St. Joseph's game this season in which officials, after having reached their locker room, reversed a last-second call, awarding victory to the other team.

In two other experiments the committee will allow, leagues can try a backboard with six inches cut off the bottom, thus preventing injury to players hitting their heads, and leagues can try a shorter front-court boundary arc, a move the rules committee believes would help the defense. The committee offered a similar experiment a year ago and there were no takers.