title: Effects of bat composition, grip firmness, and impact location on postimpact ball velocity.
abstract: The purpose of this investigation was to examine the effects of bat composition (aluminum and wooden), impact location [center of percussion (COP), center of gravity (COG), and end of the bat (E)], and grip firmness [tight (T) and no tension (NT)] on postimpact ball velocity. With the bats placed alternately in NT and T conditions, baseballs were delivered at a speed of 27.1 m.s-1 from a pitching machine positioned 1.5 m from the bat. High-speed photography (400 fps) was performed using a Locam camera positioned 7.54 m from and perpendicular to the principal plane of ball movement. A three-way ANCOVA revealed significant (P less than 0.01) differences in postimpact ball velocity between the three impact locations, with the COP yielding the greatest values, followed by the COG and E. Moreover, there was a significant (P less than 0.01) grip vs bat interaction. A simple-effects procedure revealed the following results: 1) the T grip produced greater (P less than 0.01) velocities than the NT grip across the aluminum (Al) bat; 2) there was no difference (P greater than 0.01) between the T and NT grips across the wooden (W) bat; 3) the W bat produced greater (P less than 0.01) velocities than the Al bat across the NT grip; and 4) there was no difference (P greater than 0.01) between the Al and W bats across the T grip.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: J.B. Snow Biomechanics Laboratory, Department of Health and Sport Science, Wake Forest University, Winston-Salem, NC 27109.
authors.forename: A S
authors.initials: AS
authors.lastname: Weyrich
authors.forename: S P
authors.initials: SP
authors.lastname: Messier
authors.forename: B S
authors.initials: BS
authors.lastname: Ruhmann
authors.forename: M J
authors.initials: MJ
authors.lastname: Berry
mesh_terms: D000054:Acceleration; D000535:Aluminum; D001484:Baseball; D004867:Equipment Design; D006225:Hand / Q000502:physiology; D008422:Materials Testing / Q000379:methods*; D013177:Sports; D013314:Stress, Mechanical; D014934:Wood
chemical_list: D000535:Aluminum