The Bruins were on the ice for about 30 minutes the afternoon after they lost to the New York Rangers 4-3 in overtime in Game 4 of the Eastern Conference Semifinals, failing to sweep.
"It went better again," said Seidenberg, who was injured in Game 7 of the first round against the Toronto Maple Leafs. "But now it's still day to day. I have to talk to the doctors and trainers and consult with them and go from there."
Injured defenseman Wade Redden also skated with the team.
Bruins coach Claude Julien wouldn't reveal how close either blueliner was to getting back into the lineup for Game 5 Saturday (5:30 p.m. ET, NBCSN, TSN, RDS) or beyond.
"[They] skated today. I keep telling guys they're progressing every day. That's why you see them on the ice," Julien said.
Only defenseman Andrew Ference, who hasn't played since Game 5 of the first round, wasn't on the ice. The forward lines remained the same.
Here was the Bruins' lineup for practice: