Reduced oxygen cost of running is related to alignment of the resultant GRF and leg axis vector-Moore I.pdf (431.32 kB)
Download file

Reduced oxygen cost of running is related to alignment of the resultant GRF and leg axis vector: A pilot study

Download (431.32 kB)
journal contribution
posted on 03.05.2022, 16:04 authored by Izzy MooreIzzy Moore, Andrew M. Jones, Sharon Dixon

 Purpose: This pilot study investigated whether a ten-week running programme (10wkRP), which reduced the oxygen cost of running, affected resultant ground reaction force (GRF), leg axis alignment, joint moment characteristics and gear ratios. Methods: Ten novice, female runners completed a 10wkRP. Running kinematics and kinetics, in addition to oxygen consumption (VO2) " during steady-state running, were recorded pre- and post-10wkRP. Results: VO2 decreased (8%) from pre-10wkRP to post-10wkRP. There was a better alignment of the resultant GRF and leg axis at peak propulsion post-10wkRP compared to pre-10wkRP (10.8 ± 4.9 vs. 1.6 ± 1.2°), as the resultant GRF vector was applied 7 ± 0.6° (p=0.008) more horizontally. There were shorter external ankle moment arms (24%) and smaller knee extensor moments (23%) at peak braking post-10wkRP. The change in VO2 was associated with the change in alignment of the resultant GRF and leg axis (rs = 0.88, p=0.003). Conclusion: As runners became more economical they exhibited a more aligned resultant GRF vector and leg axis at peak propulsion. This appears to be a self-optimisation strategy that may improve performance. Additionally, changes to external ankle moment arms indicated beneficial low gear ratios were achieved at the time of peak braking force. 

History

Published in

Scandinavian Journal of Medicine and Science in Sports

Publisher

John Wiley & Sons

Version

AM (Accepted Manuscript)

Citation

Moore, I.S., Jones, A.M. and Dixon, S.J. (2015) 'Reduced oxygen cost of running is related to alignment of the resultant GRF and leg axis vector: a pilot study', Scandinavian Journal of Medicine & Science in Sports

Print ISSN

0905-7188

Cardiff Met Affiliation

  • Cardiff School of Sport and Health Sciences

Cardiff Met Authors

Izzy Moore Isabel Moore

Cardiff Met Research Centre/Group

  • Applied Injury Science

Copyright Holder

© The Publisher

Language

en