Acute Effects of Different Loading Protocols Upon Performance and Kinematics of 180 Degrees Change of Direction
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Authors
van den Tillaar, Roland
Uthoff, Aaron
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Journal Article
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Taylor and Francis Group
Abstract
This study examined the acute effects of different loading protocols on 180° change of direction (COD) performance in eleven male handball players. Participants performed a 10-0-5 COD test under seven conditions: without an external load, and with 3, 6, and 9 kg loads applied under two modes-assisted into the COD and resisted out of it and resisted into the COD and assisted out of it. While total COD time was not affected (p = 0.098; η2 = 0.16), significant phase effects were observed (p < 0.001; η2 ≥ 0.55). Loading protocols significantly influenced velocity, acceleration, and their distances from COD (p < 0.001; η2 ≥ 0.37). Significant phase effects were observed for all step kinematic variables (p ≤ 0.037; η2 ≥ 0.67), except contact time, and significant interaction (phase*condition) effects for all variables (p ≤ 0.004; η2 ≥ 0.08), except for step frequency. Assisted-resisted protocols increased deceleration demands through higher COD entry velocities, displaying fewer but longer steps in the acceleration phase and greater steps taken during the deceleration phase. Resisted-assisted protocols decreased deceleration demands due to lower COD entry velocities, displaying shorter, but more steps taken in the acceleration phase, and fewer steps taken in the deceleration phase. These findings suggest that assisted-resisted and resisted-assisted loading protocols can be used to selectively overload specific phases of COD performance.Description
Keywords
Assisted sprinting, COD, Dynaspeed, resisted sprints, step kinematics, 42 Health Sciences, 4207 Sports Science and Exercise, 0913 Mechanical Engineering, 1106 Human Movement and Sports Sciences, 1303 Specialist Studies in Education, Sport Sciences, 3202 Clinical sciences, 4207 Sports science and exercise
Source
Sports Biomechanics, ISSN: 1476-3141 (Print); 1752-6116 (Online), Taylor and Francis Group, 25(2), 199-213. doi: 10.1080/14763141.2024.2427692
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