We speak a many on this blog about training for baseball, yet not much about mechanics or the actual pitching movement in general. Today I’d favor to take a fast look at one part of pitching mechanics that we study: The relationship in between the pitching arm wrist and also the pitching eight elbow during the late-cocking phase of the pitching delivery.

You are watching: In relation to the wrist, the elbow is:

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Late-Cocking phase (click for large image)

In the late-cocking step of the pitching delivery, over there are really high forces placed on the shoulder and also arm segments together they turn upwards the 937 degrees/second and also 1160 degrees/second, respectively. Component of what can reason the serious forces on the elbow in particular is just how the eight lays back in preferably Shoulder external Rotation (MER).

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Billy Wagner in ~ MER

How the arm reaches MER is vitally crucial – in pitchers with timing flaws, the forearm violently lays earlier behind the elbow in rapid succession, causing far-ranging torque on the elbow. However, this can be reduced with training and also slight mechanically changes, both of which are beyond the limit of this introductory article.

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

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Trajectory chart - Relationship in between Wrist and also Elbow

What go this graph tell us? Well, the red and also blue numbers space measured in pixels and also detail the wrist and elbow’s paths, respectively. In this student’s case, the pitching elbow swiftly outpaces the pitching wrist, resulting in the forearm come lay back reasonably rapidly in MER. The sum of all the deltas in the right-hand column expresses the absolute difference in rates of change between the 2 segments of the arm and tells united state something about timing flaws. While no every pitcher should be in ~ a offered range, this is yet one much more variable that we use to analyze a pitcher’s mechanics and also can tell us a lot around how the arm is used.