Burkhardt, David; Born, Dennis-Peter; Singh, Navrag B; Oberhofer, Katja; Carradori, Sergio; Sinistaj, Suzanne; Lorenzetti, Silvio (2020). Key performance indicators and leg positioning for the kick-start in competitive swimmers Sports Biomechanics, 22(6), pp. 752-766. Taylor & Francis 10.1080/14763141.2020.1761435
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Lorenzetti_2020_Key performance indicators and leg positioning for the kick-start in competitive swimmers.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (2MB) | Preview |
The aim of the study was to (1) assess the test-retest reliability of a novel performance analysis system for swimming (KiSwim) including an instrumented starting block and optical motion capture system, (2) identify key performance indicators (KPI) for the kick-start, (3) determine the most beneficial position of the strong leg and (4) investigate the effect of acute reversal of leg positioning. During three sessions, kick-starts of 15 competitive swimmers were investigated. Eighteen kinematic and kinetic parameters showed high reliability (ICC>0.75) from which principal component analysis identified seven KPI (i.e., time to 15 m, time on-block, depth at 7.5 m, horizontal take-off velocity, horizontal impulse back plate, horizontal peak force back plate and vertical peak force front plate). For the preferred start position, the back plate showed a higher horizontal peak force (0.71 vs. 0.96 x body mass; p < 0.001) and impulse (0.191 vs. 0.28Ns/BW; p < 0.001) compared to front plate. Acute reversal of the leg position reduced performance (i.e., increased time to 15 m and reduced horizontal take-off velocity). However, plate-specific kinetic analysis revealed a larger horizontal peak force (p < 0.001) and impulse (p < 0.001) for the back compared to the front plate in any start position investigated. Therefore, swimmers are encouraged to position the strong leg in the back.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
Swiss Federal Institute of Sports Magglingen SFISM > EHSM - Leistungssport |
Name: |
Burkhardt, David; Born, Dennis-Peter; Singh, Navrag B; Oberhofer, Katja; Carradori, Sergio; Sinistaj, Suzanne and Lorenzetti, Silvio |
ISSN: |
1476-3141 (Print) 1752-6116 (Online) |
Publisher: |
Taylor & Francis |
Language: |
English |
Submitter: |
Service Account |
Date Deposited: |
16 Mar 2021 14:39 |
Last Modified: |
21 May 2023 01:35 |
Publisher DOI: |
10.1080/14763141.2020.1761435 |
Related URLs: |
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PubMed ID: |
32462985 |
Uncontrolled Keywords: |
Force plate Freestyle Reliability Start position Swimming |
ARBOR DOI: |
10.24451/arbor.14417 |
URI: |
https://arbor.bfh.ch/id/eprint/14417 |
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