Reduced oxygen cost of running is related to alignment of the resultant GRF and leg axis vector: A pilot study
John Wiley & Sons
MetadataShow full item record
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.
Scandinavian Journal of Medicine and Science in Sports
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.
This article was published in Scandinavian Journal of Medicine and Science in Sports on 06 July 2015 (online), available at http://dx.doi.org/10.1111/sms.12514 The author's post-print was made available from 06 July 2016
- Sport Research Groups 
Showing items related by title, author, subject and abstract.
Associations between kinematic and kinetic variables and lower back injury in female bowlers in cricket Wood, Jessica (University of Wales Institute Cardiff, 2010)Lower back injuries, specifically to the lumbar spine, are the predominant reason why many bowlers are forced to end their cricketing careers. Developing knowledge of the safest yet most effective bowling technique will ...
Utility of Kinetic and Kinematic Jumping and Landing Variables as Predictors of Injury Risk: A Systematic Review Pedley, Jason; Lloyd, Rhodri S.; Moore, Isabel; Read, Paul; De Ste Croix, Mark; Myer, Greg; Oliver, Jon (Springer, 2020-11-24)Purpose: Jump-landing assessments provide a means to quantify an individual’s ability to attenuate ground reaction forces, generate lower limb explosive power and maintain joint alignment. In order to identify risk factors ...
A study to investigate whether participation in a stretch programme improves performance in student dancers. Young, Taryn (Cardiff Metropolitan University, 2014)Since the fifteenth century dance has been defined by functional technique characterised, for example in ballet, by long aesthetic lines and high levels of flexibility. The purpose of this study was to determine whether ...