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The purpose of this study was to examine the effects of shaft stiffness on puck velocity and response characteristics of carbon fibre composite ice hockey sticks during a slap shot. Six elite male ice hockey players performed six slap shots with four sticks of different shaft stiffness designated as medium (13 KN m^–1), stiff (16 KN m^–1), extra (17 KN m ^–1) and pro stiff (19 KN m^–1). These four levels represent the range in stiffness of sticks available to hockey players. The mechanics of the slap shot were evaluated by recording the initial ground reaction forces and stick deformation from high‐speed filming and puck velocity from a radar gun. Data were analysed using a 3‐way repeated measures ANOVA for 7 dependent variables: puck velocity, peak Y (front–back) and Z (vertical) forces, times to achieve peak Y and Z forces, peak deflection and time to peak deflection of the shaft. Results indicated: (1) the …