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dc.contributor.authorOliver, Jon
dc.contributor.authorDe Ste Croix, M. B. A.
dc.contributor.authorLloyd, Rhodri S.
dc.contributor.authorWilliams, Craig A.
dc.date.accessioned2016-04-06T08:58:24Z
dc.date.available2016-04-06T08:58:24Z
dc.date.issued2014
dc.identifier.citationOliver, J.L., Croix, M.B.D.S., Lloyd, R.S. and Williams, C.A. (2014) 'Altered neuromuscular control of leg stiffness following soccer-specific exercise', European Journal of Applied Physiology, 114 (11), pp.2241-2249.en_US
dc.identifier.issn1439-6319
dc.identifier.urihttp://hdl.handle.net/10369/7836
dc.descriptionThis article was published in European Journal of Applied Physiology on 18 July 2014 (online), available at http://dx.doi.org/10.1007/s00421-014-2949-zen_US
dc.description.abstractAbstract Purpose To examine changes to neuromuscular control of leg stiffness following 42 min of soccer-specific exercise. Methods Ten youth soccer players, aged 15.8 ± 0.4 years, stature 1.73 ± 0.06 m and mass 59.8 ± 9.7 kg, hopped on a force plate at a self-selected frequency before and after simulated soccer exercise performed on a non-motorised treadmill. During hopping, muscle activity was measured using surface electromyography from four lower limb muscles and analysed to determine feedforward- and feedback-mediated activity, as well as co-contraction. Results There was a small, non-significant change in stiffness following exercise (26.6 ± 10.6 vs. 24.0 ± 7.0 kN m−1, p > 0.05, ES = 0.25), with half the group increasing and half decreasing their stiffness. Changes in stiffness were significantly related to changes in centre of mass (CoM) displacement (r = 0.90, p < 0.01, extremely large correlation) but not changes in peak ground reaction force (r = 0.58, p > 0.05, large correlation). A number of significant relationships were observed between changes in stiffness and CoM displacement with changes in feedforward, feedback and eccentric muscle activity of the soleus and vastus lateralis muscles following exercise (r = 0.64–0.98, p < 0.05, large–extremely large correlations), but not with changes in co-contraction (r = 0.11–0.55, p > 0.05, small–large correlations). Conclusions Following soccer-specific exercise individual changes in feedforward- and reflex-mediated activity of the soleus and vastus lateralis, and not co-contraction around the knee and ankle, modulate changes in CoM displacement and leg stiffness.en_US
dc.description.sponsorshipThis study received grant funding support from the Union of European Football Associations (UEFA) Research Grant Programmeen_US
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.ispartofseriesEuropean Journal of Applied Physiology
dc.subjectfatigueen_US
dc.subjectfeedbacken_US
dc.subjectfeedforwarden_US
dc.subjectadolescent boysen_US
dc.subjectelectromyographyen_US
dc.titleAltered neuromuscular control of leg stiffness following soccer‑specific exerciseen_US
dc.typeArticleen_US
dc.identifier.doihttp://dx.doi.org/10.1007/s00421-014-2949-z
dc.date.dateAccepted2014-06-26


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