Associations between ground reaction force waveforms and sprint start performance

P Graham-Smith, Steffi Colyer, Aki Salo

Research output: Contribution to journalArticle

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Abstract

Ground reaction forces produced on the blocks determine an athlete’s center of mass motion during the sprint start, which is crucial to sprint performance. This study aimed to understand how force waveforms are associated with better sprint start performance. Fifty-seven sprinters (from junior to world elite) performed a series of block starts during which the ground reaction forces produced by the legs and arms were separately measured. Statistical parametric mapping (linear regression) revealed specific phases of these waveforms where forces were associated with average horizontal external power. Better performances were achieved by producing higher forces and directing the force vector more horizontally during the initial parts of the block phase (17-34% and 5-37%, respectively). During the mid-push (around the time of rear block exit: ~54% of the block push), magnitudes of front block force differentiated performers, but orientation did not. Consequently, the ability to sustain high forces during the transition from bilateral to unilateral pushing was a performance-differentiating factor. Better athletes also exhibited a higher ratio of forces on the front block in the latter parts of unilateral pushing (81-92% of the block push), which seemed to allow these athletes to exit the blocks with lower center of mass projection angles. Training should reflect these kinetic requirements, but also include technique-based aspects to increase both force production and orientation capacities. Specific training focused on enhancing anteroposterior force production during the transition between double- to single-leg propulsion could be beneficial for overall sprint start performance.
Original languageEnglish
JournalInternational Journal of Sports Science and Coaching
Publication statusAccepted/In press - 19 Aug 2019

Cite this

Associations between ground reaction force waveforms and sprint start performance. / Graham-Smith, P; Colyer, Steffi; Salo, Aki.

In: International Journal of Sports Science and Coaching, 19.08.2019.

Research output: Contribution to journalArticle

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title = "Associations between ground reaction force waveforms and sprint start performance",
abstract = "Ground reaction forces produced on the blocks determine an athlete’s center of mass motion during the sprint start, which is crucial to sprint performance. This study aimed to understand how force waveforms are associated with better sprint start performance. Fifty-seven sprinters (from junior to world elite) performed a series of block starts during which the ground reaction forces produced by the legs and arms were separately measured. Statistical parametric mapping (linear regression) revealed specific phases of these waveforms where forces were associated with average horizontal external power. Better performances were achieved by producing higher forces and directing the force vector more horizontally during the initial parts of the block phase (17-34{\%} and 5-37{\%}, respectively). During the mid-push (around the time of rear block exit: ~54{\%} of the block push), magnitudes of front block force differentiated performers, but orientation did not. Consequently, the ability to sustain high forces during the transition from bilateral to unilateral pushing was a performance-differentiating factor. Better athletes also exhibited a higher ratio of forces on the front block in the latter parts of unilateral pushing (81-92{\%} of the block push), which seemed to allow these athletes to exit the blocks with lower center of mass projection angles. Training should reflect these kinetic requirements, but also include technique-based aspects to increase both force production and orientation capacities. Specific training focused on enhancing anteroposterior force production during the transition between double- to single-leg propulsion could be beneficial for overall sprint start performance.",
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AU - Salo, Aki

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N2 - Ground reaction forces produced on the blocks determine an athlete’s center of mass motion during the sprint start, which is crucial to sprint performance. This study aimed to understand how force waveforms are associated with better sprint start performance. Fifty-seven sprinters (from junior to world elite) performed a series of block starts during which the ground reaction forces produced by the legs and arms were separately measured. Statistical parametric mapping (linear regression) revealed specific phases of these waveforms where forces were associated with average horizontal external power. Better performances were achieved by producing higher forces and directing the force vector more horizontally during the initial parts of the block phase (17-34% and 5-37%, respectively). During the mid-push (around the time of rear block exit: ~54% of the block push), magnitudes of front block force differentiated performers, but orientation did not. Consequently, the ability to sustain high forces during the transition from bilateral to unilateral pushing was a performance-differentiating factor. Better athletes also exhibited a higher ratio of forces on the front block in the latter parts of unilateral pushing (81-92% of the block push), which seemed to allow these athletes to exit the blocks with lower center of mass projection angles. Training should reflect these kinetic requirements, but also include technique-based aspects to increase both force production and orientation capacities. Specific training focused on enhancing anteroposterior force production during the transition between double- to single-leg propulsion could be beneficial for overall sprint start performance.

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