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The Saber's Edge: Power Shifts

Jeff Zimmerman

Jeff Zimmerman

Jeff Zimmerman writes about all things Baseball for RotoWire. He also handles scouting and reporting for Jeff also contributes to, and

Last week, I used velocity data to adjust projected stats. Commenter TeamCavanagh asked "Do you think that there is a similarly straightforward way to associate a hitter's 'bat speed' with an increase or decrease in power or line-drive rate?". The short answer is no, there is no straightforward easy way to see if a hitter is losing bat speed. An answer may be found by working backwards to see if all the available data points to more power, or if there are any discrepancies. The final answer will be a combination several factors.

When looking at power, it must be understood that the aging curve for power has changed recently. In the post-PED era, power peaks earlier in a player's career (age 22) than before (age 25). The reason for this change has not exactly been determined (better pre-MLB conditioning?). We shoul

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