- Title
- Kinematics that differentiate the beach flags start between elite and non-elite sprinters
- Creator
- Lockie, Robert G.; Vickery, William M.
- Relation
- Biology of Sport Vol. 30, Issue 4, p. 255-261
- Publisher Link
- http://dx.doi.org/10.5604/20831862.1077550
- Publisher
- Termedia Publishing House
- Resource Type
- journal article
- Date
- 2013
- Description
- This study differentiated the kinematics of the beach flags sprint start between five elite (three males, two females; age = 21.2 ± 2.6 years; height = 1.71 ± 0.04 m; mass = 66.2 ± 5.9 kg) and five non-elite (three males, two females; age = 20.4 ± 1.7 years; height = 1.69 ± 0.08 meters [m]; mass = 61.6 ± 5.7 kilograms) sprinters. A high-speed camera filmed the start. Timing gates recorded the 0-2, 0-5, and 0-20 m intervals. Data included body position during the start and at take-off; start time; first step length; and sprint times. A Mann-Whitney U-test determined significant (p < 0.05) between-group differences; effect sizes (ES) were also calculated. Elite sprinters had a greater take-off trajectory angle (p = 0.01; ES = 2.57), and were faster over the 0-2 (p = 0.02; ES = 1.77), 0-5 (p = 0.05; ES = 1.20), and 0-20 m (p = 0.02; ES = 1.83) intervals. Large effects were found for: greater take-off swing leg hip flexion (ES = 1.13) and trunk lean (ES = 1.37); longer duration start time (ES = 1.33); and longer first step length (ES = 1.23) in elite sprinters. A longer start time assists with force generation, which in conjunction with increased hip flexion, could translate to a longer first step. Increased trunk lean shifts the take-off trajectory angle towards the horizontal. A greater trajectory angle at start take-off, which could be advantageous for force production during sprint performance, is likely necessary for beach flags.
- Subject
- biomechanics; surf lifesaving; sprint start; acceleration; sprinting; sand surfacefound
- Identifier
- http://hdl.handle.net/1959.13/1341550
- Identifier
- uon:28767
- Identifier
- ISSN:0860-021X
- Rights
- This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
- Language
- eng
- Full Text
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