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Goalie rest: how needed is it?

I originally posted this in comments to the thread about starting Boucher on Tuesday, but then I realized that you east coasters are all asleep, and since I did all that work, I wanted someone to see it. (Though I notice the comments sections on fan posts are pretty slim -- do you guys look here?)

There have been a bunch of reasons floated for playing the backup, and I've looked into some stats on a couple.

Star-divide

1) The starter won't be as effective on the second day of a back-to-back anyway, so you might as well rest him.

I took every goalie who's started at least 20 games this year and sorted the games by how much rest they had. It included 159 games played on back-to-backs and 1552 on more rest. I was worried about it skewing, either to the good side because only the best/hottest/fittest goaltenders are allowed to go twice in a row or to the bad side because the team in front of him is tired too and makes him look worse. But here are the numbers:

On back-to-backs, goalies face 28.6 shots per game, saving 91.8% and allowing 2.50 goals.

With rest, goalies face 28.3 shots per game, saving 91.2% and allowing 2.61 goals.

I don't see any obvious signs of fatigue, either in the goalies or in their teammates.

2) The starter will get worn out down the stretch if they play too much earlier in the year.

I took stats from the last two years. In one bin, I put the 10 goalies who had 70+ starts. In the other bin are the 10 goalies who had 60-65 starts (enough that they're a clear #1, but low enough that they clearly got more rest).

The 70+ start guys:

In their final 10 games (100 total games, 10 from each goalie), they averaged allowing 2.42 goals per game, saving 91.1% of shots.

In the rest of their games, they averaged allowing 2.47 goals per game, saving 91.1% of shots.

The 60-65 start guys:

In their last 10 games, they averaged allowing 2.86 goals per game, saving 90.1% of shots.

In the rest of their games, they averaged allowing 2.54 goals per game, saving 91.2% of shots.

Again, no compelling evidence that the guys with lots of starts got worn out.

3) The backup needs playing time or he won't be ready or effective when called on.

Unfortunately, I'm tired of working on this right now, so for now I'll have to settle for questioning the need to rest the starter. But the need to work the backup seems statistically testable too...

This item was written by a member of this community and is not necessarily endorsed by Broad Street Hockey.

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I’m really curious about a couple of things:

1) When you looked at “back-to-backs”, did you compare stats in Game 1 versus Game 2?
2) What exactly does “with rest” mean?
3) When looking at goalies getting worn down, did you look at how spread out their final 10 games were?
4) Did you then look at how those goalies fared in the playoffs?
5) Like I said in the thread, I’d love to see something that can be more easily applied to Leighton. In other words, what about goalies who are first-time starters with a drastically increased work load?

Broad Street Hockey - Makin' it look mean since 1967.

by Geoff Detweiler on Mar 9, 2010 11:30 AM EST reply actions  

1) Nope, just game 2 vs all other games. Presumably game 1 would be the same as any night when they don’t have a game the next night.

2) “With rest” means that they didn’t have a game the previous day.

3) Nope.

4) I thought about it, but I’d need more sample size — half of them didn’t make the playoffs, another half only lasted one round, so it wouldn’t be many games.

5) Yeah, that’s a good question. It would take some more research.

by Eric T. on Mar 9, 2010 3:44 PM EST up reply actions  

Alright, cool. “more research” is definitely something for Gabe Desjardins to do.

Broad Street Hockey - Makin' it look mean since 1967.

by Geoff Detweiler on Mar 9, 2010 4:00 PM EST up reply actions  

I definitely think the part about goalies who have never had to handle this many games before should be researched further, since Leights isn’t exactly a guy who played 60+ NHL games last year, or any year. He did play 58 regular season games in the AHL in 2007-08 and win the ‘best goaltender in the league’ award, so we have to hope that will translate well this year, since we’ve already hedged our bets on him.

While I’m not against your numbers or conclusions, I think the troubling thing with analyzing goalies in this matter is that goalies have such a different mindset than other positions; they’re off in their own little world, and sometimes they get a reputation for being head cases. Whether they’re actually a little off-kilter to begin with or not, their performance is going to be affected by their mental state. It’s hard to determine ahead of time whether a particular goalie has the mental fortitude to handle playing that many games in a row under pressure, and I think that’s a factor where only time will tell.

by DragonGirl0583 on Mar 9, 2010 4:35 PM EST reply actions  

This the abbreviated version I left on the Case for Boucher thread

Your essentially commiting a Mcnamara Fallacy (i’m not busting your balls…obviously things are informal here and your working out an idea) but as a follower of advanced baseball metrics I’ve encounter this even from the authors of the Book (baseball sabermetrics bible, ssh don’t say anything lest I be burned at the stake). In this fallacy, " the thinker(s) forget the degree of abstraction involved in thought and draw unwarranted conclusions about concrete actuality." In this case the abstraction is statistics, and as branch of mathematics is primarily a decuditive science that provides logical form for quantifiable, empirical data to be related. The only truth this logical form provides is the validity of the argument not the truth of the premises (empirically gathered data, facts). Therefore the premises have to be true but you really haven’t established them…
     As it stands there’s a wealth of empiricaly gathered and tested knowledge about physiology involved in athletics so much so sports science/medicine is it’s own discipline. The princples they outline are tested and peer reviewed and are used as guidlines by which a trainer or coach can design a program that best fits their athletes needs vs. a team or competition scheledule. Ideally these principles should be used in every sport by every coach and team, but they are not esp. baseball, the worst offender by far.
 Anyway HuckNZ, I am not saying that you premises here are wrong just not substianted enough considering they should be measured against the principles put forth by an accepted field of study. Could be pretty interesting. If things are contradicted something else is going on, but that has to be tested. Injuries, age, recovery rates are inherently complex to just measure with past performance. By the way, so I am not cast out the sports blazer with suede elbow patches and hush puppy shoes ivy tower of baseball sabermetrics I’ll say this. In The Book there is alot a great work done on analyzing performances, quantifying skill from luck, how a metric can be translated into a Win value and then correlated with a player’s monetary value. This is fine. It’s working within parameters set by the game: the empirically gathered data refers directly to performance whose value is defined the said parameters.

by j reed on Mar 9, 2010 7:15 PM EST reply actions  

that’s right …and my hammer. I’m a contractor when not attending Hobbit Renaissance Fairs …whoops and I dropped my Star Fleet Issue tape measure. Gotta have that.

by j reed on Mar 11, 2010 10:31 PM EST up reply actions  

You'd be interested

There’s a pretty great statistical breakdown of goalie… breakdown… i think at behind the net or puck prospectus, basically outlining how goalies break down as the number of shots they take increases.

by Alon on Mar 11, 2010 10:06 AM EST reply actions  

You'd be surprised

how good a day or two’s rest will do for a goalie. I’m not saying every time there is a back to back game, rest your starter on the second day. It’s not so much as there’s a plan and statistics to look at for letting a goalie rest. It all depends on his energy and soreness level. Personally, before back to back or one game in 3 days, my coach would always ask me if i was ready to go.

As for the game yesterday, it wasnt just Leighton that looked tired, the whole team did.

by vanondubs on Mar 15, 2010 5:46 PM EDT reply actions  

This is my thinking...

this could either be a blessing through tragedy or just flat-out bad news written all-over-it.

We (the Flyers) can either use this situation, knowing the importance and severity to which our team has now been placed into and use it in a positive manner. Playing harder, playing smarter, more responsibility for one’s own actions (accountability).

Or….

We could just be flat and let it pan out like most teams are hoping it does, in utter flaming glory…right in our faces. (again) – also read the new site motto here at BSH. says it all, really.

basically the Flyers players are really into control of their team’s destiny right now with the effort they put forth on the ice here on out…Playoffs are here and a lot of these teams going to be even tougher in the post with their houses rockin’…Can we respond in kind???

Skip the Pitt, Move on down to Broad Street....
Philadelphia Flyers / Columbus Blue Jackets, 'nuff said.

by PhillyPhan85 on Mar 18, 2010 1:06 PM EDT reply actions  

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