November 13 2012 02:31PM
I've often heard it suggested that players wear down over the course of a season.
When I wrote about whether players elevate their game in the playoffs, multiple people in the comments argued that players can and should conserve energy during the regular season. It's a particularly common suggestion for older players, who are presumed to be more prone to fatigue. Guys like Jaromir Jagr and Teemu Selanne hate taking days off, but players and coaches are so convinced that they will wear out that they insist on it.
I'm not a physiology expert by any means, so I'm not qualified to make direct assessments of whether older players will suffer more cumulative fatigue than younger players would. However, I am capable of looking at whether such fatigue is born out in the stats.
The first thing to decide is what effect of fatigue we're looking for. I see two distinct questions:
- Does an older player who plays every game wear down and produce less later in the season?
- Does fatigue lead to major injuries that cause players to miss large chunks of time?
To address the first question, I pulled a list of forwards since the last lockout who a) were 36 or older, b) missed no more than five games, and c) played at least 15 minutes a game. That last criterion is both because the heavy-minutes guys are most likely to show a fatigue effect if one exists and because my simple look at points will be a more viable way to assess fatigue in top-6 guys than grinders.
That left me with 44 top-6 elders to analyze. Collectively, they had 2425 points in 3543 games, or an average of 0.68 points per game. So what we're looking for is whether they were above 0.68 points per game early in the season and below that number later in the season. Here's a look at their production by 10-game segment of the player's season:
Or in graphical form:
I find it hard to look at that data and argue that older players playing nearly every game wear down and produce less down the stretch.
The second question -- does rest help players avoid injury -- is tougher to answer. Obviously the answer is yes in some trivial sense; players get hit in every game, so skipping a game means skipping a chance to get hurt. But the discussion here is about a deeper question of fatigue and overuse; we want to see whether these old, worn out players suffer more injuries later in the season.
This gets challenging to dig into because there are a lot of reasons a player might might miss a game. Let's start by again narrowing things down to the high-scoring players (>0.5 PPG) who teams want in the lineup, who aren't likely to be scratched unless injury forces them out of the lineup.
Those 89 players collectively had 73 spans where they missed more than a week of play, which we'll presume were because of injury in most cases. The breakdown of when those spans began is as follows:
Admittedly, this is a crude pass at things. Disruption from effects like a tendency of players to fight through injury late in the season prevents me from making definitive statements about a cumulative effect of injury. But remember that whatever injuries they might be playing through didn't seem to result in decreased production.
I suppose it could be argued that by narrowing things down to the players who play the whole season or score a half-point per game, I've already limited the focus to players who are unusually able to survive the grind. And that may be true, but a) I'm not sure people really worry about whether Jamal Mayers wears down at the end of the year, and b) I'd like to see some evidence on the other side beyond "I'm 37 years old and after one hard skate I'm all sore; a whole NHL season is brutal just to think about."
I don't doubt that players feel worse by the end of the year as a result of accumulated bruises and strains, and this might be particularly true of older players whose bruises and strains don't heal as fast. However, if they're playing just as many games and scoring just as much as they did at the start of the year, are we sure that the grind of a long season affects their contributions on the ice?