External Rotation
External rotation, also called lateral rotation, is rotation away from the body.
In pitching, external rotation usually refers to the lateral rotation of the arm where the axis of rotation is the length of the humerus. In the delivery, this resembles backwards or reverse rotation of the forearm and is sometimes called "forearm lay back."
The deltoid, infraspinatus, and teres minor are muscles used for active external rotation.
Passive external rotation can occur as an inertial continuation of active external rotation and as an inertial reaction to the body's forward acceleration of the shoulder and elbow during a pitch.
See also: internal rotation.
Recent Posts
- Chase DeLauter, Tommy White: Early Impressions
- March 6, 2022
- Rays Find Elite Value All Over
- January 29, 2022
- Developing Arm Action in Early Youth Throwers
- January 24, 2022
- Pitch Movement, Part V: (Sp)in Your Eyes
- February 9, 2021
- Pitch Movement, Part IV: Tunnel Vision
- June 25, 2020
- Scouting Grades: Power
- June 22, 2020
- Pitch Movement, Part III: The River of Seams
- April 2, 2020
- Pitch Movement, Part II: Sweet Seams (Are Made of This)
- March 15, 2020
- Pitch Movement, Part I: You Spin Me Round (Like a Baseball)
- February 28, 2020
- Scouting Grades: Speed
- February 20, 2020
- [posts archive]