The Bruins placed Jonas Gustavsson on injured reserve on Monday as they awaited final test results on his condition. The backup goalie left last Tuesday’s 6-2 loss to Anaheim after the first period because of an elevated heart rate. He worked out with goaltending coach Bob Essensa on the ice before practice Monday but did not join his teammates.

“From what I know, he was good right after,’’ coach Claude Julien said. “Probably it’s just a precaution more than anything else on their part. Hopefully we’ll get that clearance soon.’’

With Gustavsson unavailable for practice, the Bruins recalled Malcolm Subban from Providence on an emergency basis. The third-year pro started the season slowly but found his rhythm in January, going 7-0-1 with a 1.84 goals-against average and a .935 save percentage. He has become Providence’s No. 1 goalie for the first time.

“He’s been a lot more consistent,’’ Julien said. “That’s just a goaltender maturing into closer as a starter over there. I think he’s played in the majority of the games versus in the past, where there was a split. He’s done a really good job of taking over in Providence, and he’s played well.’’

The Bruins cited Subban’s athleticism in taking him in the first round of the 2012 draft. He was raw and hadn’t learned the technical side of the position. But his physical ability made his ceiling higher than every other draft-eligible goalie that year save for Andrei Vasilevskiy (No. 19 overall to Tampa Bay).

The 22-year-old Subban is still learning the intricacies under Essensa. He’s not as aggressive. He’s turning to his positioning more than his athleticism to make saves and staying in position for followup shots.

“I’m being a little more calm in the net and letting the puck come to me,’’ Subban said. “I’m not jumping around as much.’’

Line maneuvering

In the four games just before the All-Star break, Julien’s lines were as jumbled as a bag of Scrabble tiles. Ryan Spooner played all three positions. Loui Eriksson didn’t just shift between wings, he played on the second and third lines.

The juggling was out of necessity, and the Bruins coach is seeking a more stable approach.

To that end, Julien moved Spooner back to the middle in Monday’s practice at TD Garden, putting him on the third line between Matt Beleskey and Jimmy Hayes. Eriksson practiced as the No. 2 left wing alongside David Krejci and David Pastrnak. Joonas Kemppainen served as a placeholder for Patrice Bergeron, who was given the day off after returning from the All-Star Game, on the first line between Brad Marchand and Brett Connolly.

Once Bergeron replaces Kemppainen Tuesday, Julien hopes the lines will be good to go, not just against Toronto, but for a few more games after that.

“I’d like to stabilize it a little bit,’’ Julien said. “There’s no set lines or anything, ever. You’ve seen that in the past where I’ve had to move players, even when we’ve had set lines.

“It just creates a little bit more chemistry. They get used to playing a little bit more. They know where they are a little bit better.’’

The Bruins thought about using Spooner as their third-line center upon Krejci’s return Jan. 21 against Vancouver. But the team’s inconsistency at right wing was one reason Julien moved Spooner out of position.

Spooner did well, and he will bring a four-game scoring streak into Tuesday’s game against the Maple Leafs.

But moving Spooner to the wing cratered the third line. Kemppainen, who took most of the third-line shifts at center, did not deliver a shade of offensive presence. Beleskey, an effective left wing for Spooner, did not play well next to Kemppainen.

Another factor in Julien’s juggling was Pastrnak’s upper-body injury, which slowed the second-year pro upon his return from the World Junior Championships. During the break, Pastrnak played in one game for Providence. He scored a goal and had two assists in Providence’s 8-1 drubbing of Springfield. The Bruins recalled him Tuesday, hopeful that his one-game AHL stint was enough to steer his recovery in the right direction.

“I’d love to be able to get some consistency in my lines here,’’ Julien said. “I’m hoping I can get some of that moving forward.’’

Eriksson on the edge

Eriksson has never been on the edge of unrestricted free agency. So he could be entering his final month as a Bruin before the Feb. 29 trade deadline if the organization wants assets for the 30-year-old wing. It’s a good bet Eriksson would get more salary and term on the free market. “It’s a little bit different when you have a big family like I have and a baby on the way too,’’ Eriksson said. “There’s a lot of things going on right now. We like it here. Boston is a really good city. It’s a fun team to play for.’’ . . . Adam McQuaid, who last played Jan. 5, resumed skating Monday. Before practice, he was on the Garden ice for a solo session with strength and conditioning coach John Whitesides. McQuaid has missed 11 games because of a concussion . . . The Bruins begin a punishing stretch Tuesday. They will play 14 games in 27 days in February, including a six-game road trip. They will play every other day save for one segment, when they have two days off between Saturday’s game against Buffalo and next Tuesday’s reunion with Milan Lucic. “Really take your mind off the game and hockey,’’ Tuukka Rask said of the All-Star break. “Then get ready for that grind. Because the second half after the All-Star break is always very hectic. Every team’s fighting for the playoff spot. It’s really tight.’’

Fluto Shinzawa can be reached at fshinzawa@globe.com. Follow him on Twitter @GlobeFluto.