Dataset title: Kinematic data from youth baseball pitchers recorded with PITCHPERFECT motion sensors

Person responsible for data collection: Erik van der Graaff, erik@pitchperfect-baseball.com

File name: DataClassification.csv

Data set contains kinematics, ball velocity, pitcher's characteristics and pitch types from youth pitchers that are members of the elite youth academies of the Royal Dutch Baseball and Softball Federation (KNBSB).

The data were collected during the pitchers' regular training at the training facilities of the affiliated baseball academy. To maintain pitching specific routines, warm-up and pitch count were not standardized. After performing their standard warm-up, pitchers were instructed to throw a selection of pitch types they usually throw during the game, containing a minimum of three different pitch types. The pitchers followed their own training routine in accordance with the training program set by their pitching coach. The bullpen session consisted of minimum 20 pitches from mound towards a catcher at the official distance of 18.45 or 16.45 meter, depending on pitcher's age.

The pitching motion was recorded using the PITCHPERFECT system (PITCHPERFECT, The Netherlands) consisting of two synchronized 3-DOF IMUs (Gyroscope  2000 deg/s). Sensors were taped with Leukoplast FixoMull stretch (BSN Medical GmbH, Hamburg, Germany) on the processus Xiphoideus on the chest and in the middle of the left and right posterior superior iliac spine on the lower back of the pitcher before starting the bullpen. Pitch types were manually coded by experienced off-field staff member based on the visual inspection, hand signal and pitcher - catcher agreement prior to each throw. The ball velocity [mph] was measured from behind the pitcher with a Pocket radar Ball coach, Model PR1000-BC (Pocket Radar Inc., Santa Rosa, CA, USA). Accuracy of the pitch was noted, distinguishing only between a wild pitch or not, where a wild pitch noted if the catcher was unable to catch the ball within reasonable effort.

Attributes: 

1. ID = The ID number assigned to the participant.
2. Age = Age of the participant in years.
3. Height = Height of the participant in cm.
4. Weight = Weight of the participant in kg.
5. Experience = Number of years as a pitcher.
6. Count = Pitch count.
7. Multiclass = Pitch type (FB = Fastball, CU = Curveball, CH = Change-up).
8. Binary = Pitch type (FB = Fastball, Other = if CU or CH).
9. Pelvis = Peak angular velocity of pelvis in deg/s measured by PITCHPERFECT sensor placed on pelvis.
10. Trunk = Peak angular velocity of trunk in deg/s measured by PITCHPERFECT sensor placed on sternum.
11. Separation = Separation time in ms denoting the timing between Pelvis and Trunk.
12. BallSpeed = Ball speed in mph.
