Journal article 1132 views 120 downloads
Ratio of forces during sprint acceleration: A comparison of different calculation methods
,
Steffi Colyer,
Ryu Nagahara,
Helen Bayne,
Ian Bezodis,
Jean-Benoît Morin,
Munenori Murata,
Pierre Samozino
Journal of Biomechanics, Volume: 127, Start page: 110685
Swansea University Author:
Neil Bezodis
-
PDF | Accepted Manuscript
©2021 All rights reserved. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND)
Download (619.98KB)
DOI (Published version): 10.1016/j.jbiomech.2021.110685
Abstract
The orientation of the ground reaction force (GRF) vector is a key determinant of human sprint acceleration performance and has been described using ratio of forces (RF) which quantifies the ratio of the antero-posterior component to the resultant GRF. Different methods have previously been used to...
| Published in: | Journal of Biomechanics |
|---|---|
| ISSN: | 0021-9290 |
| Published: |
Elsevier BV
2021
|
| Online Access: |
Check full text
|
| URI: | https://cronfa.swan.ac.uk/Record/cronfa57614 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Abstract: |
The orientation of the ground reaction force (GRF) vector is a key determinant of human sprint acceleration performance and has been described using ratio of forces (RF) which quantifies the ratio of the antero-posterior component to the resultant GRF. Different methods have previously been used to calculate step-averaged RF, and this study therefore aimed to compare the effects of three calculation methods on two key “technical” ability measures: decline in ratio of forces (DRF) and theoretical maximal RF at null velocity (RF0). Twenty-four male sprinters completed maximal effort 60 m sprints from block and standing starts on a fully instrumented track (force platforms in series). RF-horizontal velocity profiles were determined from the measured GRFs over the entire acceleration phase using three different calculation methods for obtaining an RF value for each step: A) the mean of instantaneous RF during stance, B) the step-averaged antero-posterior component divided by the step-averaged resultant GRF, C) the step-averaged antero-posterior component divided by the resultant of the step-averaged antero-posterior and vertical components. Method A led to significantly greater RF0 and shallower DRF slopes than Methods B and C. These differences were very large (Effect size Cohen’s d = 2.06 – 4.04) and varied between individuals due to differences in the GRF profiles, particularly during late stance as the acceleration phase progressed. Method B provides RF values which most closely approximate the mechanical reality of step averaged accelerations progressively approaching zero and it is recommended for future analyses although it should be considered a ratio of impulses. |
|---|---|
| Keywords: |
ground reaction force, impulse, sprinting, technique |
| College: |
Faculty of Science and Engineering |
| Start Page: |
110685 |