We speak a lot of on this blog around training because that baseball, however not much about mechanics or the actual pitching activity in general. This particular day I’d favor to take it a rapid look in ~ one part of pitching mechanics that we study: The relationship in between the pitching arm wrist and also the pitching eight elbow throughout the late-cocking step of the pitching delivery.

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Late-Cocking phase (click for big image)

In the late-cocking phase of the pitching delivery, over there are very high forces placed on the shoulder and also arm segments together they turn upwards of 937 degrees/second and also 1160 degrees/second, respectively. Component of what can reason the serious forces on the elbow in details is how the arm lays ago in maximum Shoulder exterior Rotation (MER).

Billy Wagner at MER

How the eight reaches MER is vitally vital – in pitchers through timing flaws, the forearm violent lays ago behind the elbow in fast succession, causing far-reaching torque on the elbow. However, this can be lessened with training and also slight mechanical changes, both of i m sorry are past the limit of this introductory article.

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One method we research the relationship between the pitching arm wrist and elbow is to execute a trajectory evaluation on a pitcher, measuring the path of the pitcher’s driveline and the price of adjust of various arm segments. While ns can’t present you any video from my present clients (privacy reasons and also all), ns can display you some anonymous data native a first-time customer that I have actually handy. This pitcher is a youth pitcher who had actually his current entry review with high-speed footage taken within the previous month. The chart below details the relationship between the pitching elbow (blue) and also the pitching wrist (red). Likewise shown in the chart are the rates of change (delta) in between each time interval (0.00476 seconds, if you were wondering!) and also the delta in between each delta! (Absolute worths were offered in measure up the price of readjust of the deltas.)

Trajectory chart - Relationship in between Wrist and also Elbow

What walk this chart tell us? Well, the red and blue numbers room measured in pixels and also detail the wrist and also elbow’s paths, respectively. In this student’s case, the pitching elbow swiftly outpaces the pitching wrist, leading to the forearm come lay back relatively rapidly in MER. The amount of every the deltas in the right-hand obelisk expresses the absolute distinction in prices of change between the two segments the the arm and tells us something about timing flaws. While no every pitcher should be in ~ a given range, this is yet one much more variable that we use to analysis a pitcher’s mechanics and also can tell united state a lot about how the arm is used.