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One of the recurring points of discussion on my beer league team is shift times: many of us (including me) are pushing for shorter, more energetic shifts while some players prefer longer shifts, which they view as a way to get more playing time.
That's totally understandable. Who doesn't like to play? That said, if you watch a lot of hockey games with a critical eye, it's easy to see that players who are going all out get tired quickly. After all, there are numerous studies pointing to the fact that humans can only go all-out for a minute or so.
Here's an excerpt from the book "Exercise and Sport Science:"
Long shifts of high intensity result in accumulation of muscle lactate and a rapid reduction in myscle glycogen, particularly from the fast-twitch fibers. If high concentrations of lactic acid are produced, the muscle acidity caused metabolic and contractile disturbancees that result in decreased work performance."
Check out these statistics from this past NHL regular season: they show average ice time per shift per player. The guy with the longest shifts in the NHL is Washington defenseman Mike Green, who averages 62 seconds per shift with about 24 shifts per game. (Click on the link to see the full list; that's a screen shot above).
In other words, NHL players are taking a lot of shorter and more explosive shifts. Obviously, things are a little different in beer league hockey, which often uses running time -- i.e. the clock continues to run even when play stops for a face-off or goal.
