Mavericks coach Rick Carlisle fainted on the team's practice court this afternoon and was taken from American Airlines Center on a stretcher.
It was unknown specifically what happened to Carlisle, who was sitting up on the stretcher when he was wheeled toward the loading dock at about 12:38 p.m. An ambulance was waiting. At 12:50 p.m., the ambulance left the loading dock.
President of basketball operations Donnie Nelson and assistant coach Terry Stotts both said that Carlisle was lightheaded and fainted. Nelson, who was among several front-office members who were at Baylor Medical Center with Carlisle, said the coach was doing fine and feeling much better.
"He just fainted, and I'd bet most of us have had that happen to us," Nelson said.
Carlisle was resting comfortably, but will not accompany the team to Indian Wells, Calif., this afternoon, where the Mavericks play Phoenix on Saturday night.
Carlisle texted the Dallas Morning News late Friday afternoon and said he was fine.
As he was taken out of the arena, Carlisle was moving his arms and was alert.
The Mavericks were scheduled to practice from noon until 1:15 p.m., but activity in and around the team's offices inside AAC quickly changed at about 12:30, when Carlisle hit the floor.
"I heard the fall," said point guard Jason Kidd. "We don't know what the situation is. Basketball is our job, but life comes before our job or anything else. Your well-being is the most important thing. That's our coach and our family member. We got to make sure he's all right and we'll go from there."
Coaches' health has been in the news lately since Michigan State football coach Mark Dantonio had what was described as a mild heart attack after his team played Notre Dame last month.
Stress levels in the coaching business often are very high.
Stotts was with Carlisle after he fainted.
"I don't know exactly what happened," Stotts said. "It looked like he passed out and the medical people came and took him away.
"He was pale, but he was alert and talking to Casey (Smith, the Mavericks' athletic trainer). We're all concerned about him and hopefully everything is OK and it's just a one-time thing."
Practice ended abruptly after the incident and players were sent into the weightlifting area and emergency personnel arrived quickly at the arena to tend to Carlisle, who will turn 51 on Oct. 27.
Carlisle was hired the Mavericks before the 2008-09 season. In two seasons with the Mavs, he has a 105-69 regular-season record and 7-11 postseason record.
Carlisle also coached the Detroit Pistons and Indiana Pacers.