GREEN BAY – The music sounds, and the players stop. It’s a television timeout, without the television. Towels are draped around helmetless heads, heart rate monitors are strapped around body parts.

On the field, the Green Bay Packers coaching staff has decided to incorporate the breaks in activity into training camp to better simulate start-and-stop nature of a game. As for the monitors, the more data that can be collected from the players about the energy they’re exerting, the better.

Off the field, diet and weight-lifting regimens have been re-evaluated and redefined.

"I like it," said Packers left tackle Bryan Bulaga, who missed the final seven weeks of the 2012 season with a fractured hip. "There’s a lot of science behind that; there’s been a lot of thought that was put into it. I think it’s good."

"We’re not just putting 500 pounds on the bench and doing that," added offensive lineman Don Barclay. "We’re doing stuff to help us throughout the whole season and keep us injury (free). I think they do a great job with that."

This is all in the name of injury prevention, a story that just days into NFL training camps is already proving mythological – even for the Packers.

Rookie wide receiver Charles Johnson, who missed all of OTAs with a hamstring pull, wrenched a knee Friday. Fellow rookie wideout Kevin Dorsey missed time with a leg injury and, more seriously, free agent receiver Sederrick Cunningham broke his wrist.

That doesn’t include the group of players who were physically unable to open camp last Friday, a group that was headlined by cornerback Casey Hayward (hamstring), defensive end Mike Neal (abdomen) and running back DuJuan Harris, who had offseason surgery to remove a cyst from a lung.

Rookie offensive lineman J.C. Tretter, a fourth-round draft pick, broke an ankle during a May offseason training activity (OTA) and second-year defensive lineman Jerel Worthy is still rehabbing a late-season tear to his ACL. Those two players may yet miss the season.

Two unknowns are safety Sean Richardson and offensive lineman Derek Sherrod. Richardson hasn’t been cleared for contact after January neck surgery and Sherrod hasn’t played since December of 2011.

Technically, "only" the receivers have been injured in camp thus far in just three days of activity, which means the Packers are faring better than its counterparts across the league.

Philadelphia Eagles receiver Jeremy Maclin (knee), Baltimore Ravens tight end Dennis Pitta (hip) and Denver Broncos center Dan Koppen (knee) are already lost for the season and Cleveland Browns offensive lineman Ryan Miller was concussed so badly he was hospitalized.

Those were just the headline-grabbers. The Chicago Bears lost a defensive lineman (Turk McBride), the New York Jets lost a cornerback (Aaron Berry), the San Diego Chargers lost a linebacker (Jonas Mouton) and the Miami Dolphins lost a wide receiver (Armon Binns).

Then there were the "scares" – like Cincinnati Bengals’ wideout A.J. Green (bruised knee) and Bears left tackle Jermon Bushrod (strained calf).

Many of these injuries came before the players were in pads, and the first preseason game is still 10 days away.

Catastrophic injury is the name of the game in the NFL. The players and coaches know it. But small changes, be it in diet or weight lifting, may at least help the team avoid the less serious maladies that plagued the team all through the 2012 preseason.

"It’s important," Bulaga said of the changes, which so far has included less repetition and less time on their feet. "You want to have everyone healthy and practicing and getting on the same page during training camp. We had a lot of guys that were nicked up last year during training camp, and that affects things. To keep as many guys as we can healthy and practicing and coach has done a great job with it, it’s only going to help. When you can get the same 11 guys practicing every day and doing new schemes together and just working things in during training camp, it’s only a positive thing."