Trail Wrist Data of a Tour Player

Here is TRAIL wrist data analysis of a tour player’s mid-iron swing. This is quite typical tour player pattern so it can serve as good learning material. Pay special attention to how extension gets released and how the player starts pronating before impact, around shaft parallel.

Trail Wrist Flexion (-)/Extension (+)

Below you can see graph of trail wrist data:

  • flexion (bowing) (-) negative graph values
  • extension (cupping) (+) positive graph values
  1. Starts with extended trail wrist at address, +21 degrees
  2. Adds 43 degrees of trail wrist extension during the backswing and reaches 64 degrees at the top
  3. During downswing, before shaft parallel adds a bit more extension, loading of the trail wrist
  4. Release of extension through impact, but still 39 degrees extended at impact

Trail Wrist Radial (+)/Ulnar (-) Deviation

Below you can see graph of trail wrist data:

  • radial deviation (thumb UP direction) (+) positive graph values
  • ulnar deviation (pinky DOWN direction)  (-) negative graph values
  1. Starts with unhinged trail wrist at address, -24 degrees
  2. Adds 29 degrees trail wrist hinge during the backswing and reaches +5 degrees radial deviation at the top
  3. During downswing, before shaft parallel starts ulnar deviation of the trail wrist
  4. Impact position is similar to address, slightly more ulnar deviation -28 degrees

Global Rotation – Pronation (+) and Supination (-) direction

Below you can see graph of trail wrist data global rotation:

  • supination direction (palm UP move) (-) negative graph values
  • pronation direction (palm DOWN move) (+) positive graph values
  1. Always starts with reference position at address, 0 degrees
  2. Slight rotation in pronation direction before top of the backswing
  3. During downswing starts rotation in supination direction
  4. Around shaft parallel before impact starts to rotate in pronation direction and keeps rotating through impact

Full picture – all 3 graphs

Now take a look at all 3 graphs together, pay attention to the sequencing of the 3 motions.

During downswing first there is ulnar deviation, followed by release of extension and pronation right before impact.

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The HackMotion wrist sensor in front of various devices showing data in the HackMotion app
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