Kinematic and Kinetic Analyses of E-TPU Material in Bowling Footwear

The purpose of this study was to examine the effects of midsole construction (barefoot, traditional bowling shoes with minimalist midsole design, and the modified bowling shoes with E TPU midsole design) on the amount of shock absorption and the mechanics of bowling delivery. All shoes underwent static testing on top of a force platform. The static test involved dropping a 0.5 kg dumbbell inside a PVC pipe from a height of 0.61 meters onto the heel cup region in each type of shoe. Twelve healthy, college, right-handed recreational males participated in dynamic testing of bowling delivery. Data collection took place at the Biomechanics Laboratory. Participants stood five meters away from cushioning mate and performed a four-step approach to roll the bowling ball on top of a mat. A Casio high speed camera was set up to capture the right sagittal view of bowling ball delivery at 120 Hz in conjunction with a 650 watts spotlight. Every participant was asked to bowl five balls in each type of footwear, so a total of 15 bowls were collected for each participant. A total of 180 trials were collected in this study. Force plate data were recorded at 1000 Hz with Vicon Nexus software to evaluate the amount of shock and force absorption. Ariel Performance Analysis System (APAS) software was used to measure the 2D body kinematic joint angles and velocities of hip, knee, and ankle, stride length, and linear ball velocity. For the static testing, a t-test was conducted to compare the amount of vertical ground reaction force between the traditional bowling footwear with minimalist midsole design and the modified bowling footwear with E-TPU midsole design. For the dynamic testing, a one-way repeated measure ANOVA for the initial peak vertical force (Fz), the rate of loading, and peak vertical ground reaction force to body weight ratio were compared between three different footwear conditions. A one-way repeated ANOVA (α = 0.05) for the joint angles and velocities of hip, knee, and ankle, stride length, and linear ball velocity ...