2020 Theses and Dissertations
Permanent URI for this collectionhttps://hdl.handle.net/11274/13270
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Browsing 2020 Theses and Dissertations by Author "Becker, Kevin"
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Item The effect of target height on the ground reaction force/ moment parameters during the Taekwondo roundhouse kick(5/8/2020) Kim, Jaewoong; Becker, Kevin; Kwon, Young-HooAttacking varied heights with the roundhouse kick is beneficial for scoring. The path of the kicking foot travels from the ground to the target through multiple planes. Thus, the path of kicking foot must be modified for the different target heights through the linear and angular kicker-ground interaction: ground reaction forces (GRFs) and ground reaction moments. The purpose of this study was to investigate how the kicker uses the ground to generate the necessary angular interactions during the roundhouse kick in various target height conditions. Twenty-eight male black belt holders were recruited for this study. Participants were asked to perform seven roundhouse kicks to each of three target heights. Selected variables were computed through a 9-camera VICON motion capture system (250 Hz) and three force plates, with 69 reflective markers. The data were imported into the Kwon3D (5.1) motion analysis software for subsequent data processing. Two MANOVA were used to compare the dependent variables across the target conditions (each MANOVA was set 0.025). The first MANOVA with moment parameters showed significant differences in the ground reaction force moments (GRFMs): clockwise G_x peak (abdominal > head) and counterclockwise G_x peak and clockwise G_y (abdominal < chest and head). The second MANOVA with GRF variables found significant differences in the F_z of the kicking foot (chest > head), in the leftward F_x of the supporting foot (head < abdominal and chest), and in the backward F_y and upward F_z of the supporting foot (head > chest > abdominal). GRFMs about the right/left axis and the forward/backward axis, and the PM about the vertical axis were identified as the major moment terms. Two peak moments were identified at different timing: the first and second clusters were associated with the kicking foot F_z peak and the support foot F_z peak, respectively. The GRFMs about the horizontal axes mainly revealed significant inter-target height differences with higher target condition showing higher GRFMs. Further investigation to establish the relationship between the maximum foot speed and various moment parameters is warranted.