voukelatos et al 2018 repository.pdf (1.03 MB)
Training induced changes in quadriceps activation during maximal eccentric contractions
journal contribution
posted on 2018-05-09, 10:55 authored by Dimitrios VoukelatosDimitrios Voukelatos, Mathew Kirkland, Matthew PainMatthew PainDespite full voluntary effort, neuromuscular activation of the quadriceps group of muscles appears inhibited during eccentric contractions. A nerve stimulation protocol during dynamic contractions of the quadriceps was developed that employed triplets of supramaximal pulses to assess suppressed eccentric activation. Subsequently the effects of a short training intervention, performed on a dynamometer, on eccentric strength output and neural inhibition were examined. Torque-angular velocity (T-ω) and experimental voluntary neural drive-angular velocity (%VA-ω; %VA, obtained via the interpolated twitch technique) datasets, were obtained from pre- and post-training testing sessions. Non-linear regression fits of a seven parameter torque function and of a 3rd degree polynomial were performed on the pre- and post-training T-ω and %VA-ω datasets respectively. T-test showed a significant (p < 0.05) increase in the overall torque output post-training for the group, with three out of the six subjects demonstrating a significant (p < 0.05) increase in the torque output across the range of angular velocities as shown by the extra-sum-of-squares F-test. A significant increase (p < 0.05) in the %VA post-training was also observed as well as a reduction in the plateauing of the torque output during fast eccentric contractions.
History
School
- Sport, Exercise and Health Sciences
Published in
Journal of BiomechanicsCitation
VOUKELATOS, D., KIRKLAND, M. and PAIN, M.T.G., 2018. Training induced changes in quadriceps activation during maximal eccentric contractions. Journal of Biomechanics, 73, pp.66-72.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2018-03-09Publication date
2018Notes
This paper was published in the journal Journal of Biomechanics and the definitive published version is available at https://doi.org/10.1016/j.jbiomech.2018.03.025.ISSN
0021-9290Publisher version
Language
- en