The effectiveness of ankle braces at reducing ground reaction forces experienced by the ankle during the 'stop' and 'go' phases of the drag skill in field hockey
Cardiff Metropolitan University
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The purpose of the study was to investigate the effects of ground reaction forces (GRF) on the ankle during the stop and go phases of a drag skill in field hockey, and to determine the effectiveness of ankle braces at reducing GRF. Eight county standard female hockey players (age 20.5 years + 0.5, mass 63.6 kg+ 8.1, height 162.5 cm+ 5.7), participated in this study, they were filmed whilst performing a left to right drag skill on a force platform in three conditions: l. Foam brace,2. Lace-up brace, 3. No brace. Data was analysed in terms of the mean, standard deviation, root mean squared difference (RMSD) and a repeated measures ANOVA. Condition 2 produced the highest impact maximum (2.1 BW +.0.29), and loading rate (50. 1 BW.s4 + 25.4), with the no brace condition producing the lowest values (impact maximum : 1.8 BW + 0.39, loading rate:43.4 BW.s-l + 19). Significant differences (p<0.05) occurred for stance time, braking impulse and propulsion impulse in each condition. The greatest quantity of force was experienced in the 'go' phase (0.13 B'W.s-r + 0.01 in condition2).Inconclusion, ankle braces were ineffective at reducing GRF and the go phase was the most debilitating phase of the stop and go movement. Further research into proprioceptive qualities of ankle braces and stability are required.
BSc (Hons) Sport, PE and Recreation
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