The Associated Press

CARSON, Calif. - San Diego Chargers running back LaDainian Tomlinson on Wednesday left practice on a cart for the second time in less than a week, this time because of bruised left heel.

Tomlinson took a handoff and had his body twisted while his feet remained planted. Tomlinson believes someone accidentally kicked his heel as the play came to an end.

"I've got a bruised heel, Achilles' ... something," said Tomlinson, the NFL's second-leading rusher last season. "It's always something, and it's frustrating."

Last week, Tomlinson became dehydrated and overheated during a morning practice.

Tomlinson didn't expect to have X-rays or an MRI on the heel.

"We're going to see if it calms down," Tomlinson said. "It doesn't seem like it is too bad."

But it was bad enough that Tomlinson pulled himself from practice.

"I was limping back and I knew I felt pain," he said. "So I was done after that."

Wide receiver David Boston's practice also was derailed by a sore heel. Boston said he didn't anticipate being sidelined for long.

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