Denver trainer Steve Antonopulos, left, tends to linebacker Warrick Holdman after Holdman sustained a blow to the helmet in practice. Holdman was taken to the hospital Thursday in Denver.

ENGLEWOOD, COLO. ? Denver Broncos linebacker Warrick Holdman was hospitalized with a spinal cord concussion following a collision with a teammate at training camp Thursday.

Holdman was carted off the field strapped to a backboard and taken by ambulance to Sky Ridge Medical Center, where he was being kept overnight for observation, team spokesman Jim Saccomano said.

Holdman temporarily lost feeling in his extremities but had movement in his arms and legs by the time he was taken off the field.

“He went numb for about 30, 40 seconds out there. He got his feeling back, which is a good sign,” coach Mike Shanahan said. “… It was a good sign when he could move his fingers, move his toes and was able to sit up. We’ll keep our fingers crossed.”

Holdman appeared to hit the crown of his helmet on another player’s helmet and crumpled to the grass midway through the morning workout. He was rolled over onto his back after a minute, but stayed down for eight minutes.