Effects of bat grip on baseball hitting kinematics.
A motion system collected 120-Hz data from 14 baseball adult hitters using normal and choke-up bat grips. Six swings were digitized for each hitter, and temporal and kinematic parameters were calculated. Compared with a normal grip, the choke-up grip resulted in 1) less time during stride phase and swing; 2) the upper torso more opened at lead foot contact; 3) the pelvis more closed and less bat linear velocity at bat-ball contact; 4) less range of motion of the upper torso and pelvis during swing; 5) greater elbow flexion at lead foot contact; and 6) greater peak right elbow extension angular velocity. The decreased time during the stride phase when using a choke-up grip implies that hitters quicken their stride when they choke up. Less swing time duration and less upper torso and pelvis rotation range of motion using the choke-up grip supports the belief of many coaches and players that using a choke-up grip results in a "quicker" swing. However, the belief that using a choke-up grip leads to a faster moving bat was not supported by the results of this study.
Escamilla
Rafael F
RF
Department of Physical Therapy, California State University, Sacramento, CA, USA.
Fleisig
Glenn S
GS
DeRenne
Coop
C
Taylor
Marcus K
MK
Moorman
Claude T
CT
Imamura
Rodney
R
Barakatt
Edward
E
Andrews
James R
JR
D000328:Adult; D001484:Baseball / Q000502:physiology*; D001696:Biomechanical Phenomena; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D010865:Pilot Projects