Knee joint neuromuscular activation performance during muscle damage and superimposed fatigue

Minshull, C., Eston, R., Rees, D. and Gleeson, N., 2012. Knee joint neuromuscular activation performance during muscle damage and superimposed fatigue. Journal of Sports Sciences, 30 (10), pp. 1015-1024. ISSN 1466-447X

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Abstract

This study examined the concurrent effects of exercise-induced muscle damage and superimposed acute fatigue on the neuromuscular activation performance of the knee flexors of nine males (age: 26.7 ± 6.1yrs; height 1.81 ± 0.05m; body mass 81.2 ± 11.7kg [mean ± SD]). Measures were obtained during three experimental conditions: (i) FAT-EEVID, involving acute fatiguing exercise performed on each assessment occasion plus a single episode of eccentric exercise performed on the first occasion and after the fatigue trial; (ii) FAT, involving the fatiguing exercise only and; (iii) CON consisting of no exercise. Assessments were performed prior to (pre) and at lh, 24h, 48h, 72h, and 168h relative to the eccentric exercise. Repeated-measures ANOVAs showed that muscle damage within the FAT-EEVID condition elicited reductions of up to 38%, 24%) and 65%> in volitional peak force, electromechanical delay and rate of force development compared to baseline and controls, respectively (F[io, 80] = 2.3 to 4.6; p <0.05) with further impairments (6.2%> to 30.7%>) following acute fatigue (Fp; i6] = 4.3 to 9.1; p <0.05). By contrast, magnetically-evoked electromechanically delay was not influenced by muscle damage and was improved during the superimposed acute fatigue (~14%>; Fp, iq = 3.9; p <0.05). The safeguarding of evoked muscle activation capability despite compromised volitional performance might reveal aspects of capabilities for emergency and protective responses during episodes of fatigue and antecedent muscle damaging exercise.

Item Type:	Journal article
Description:	This is an Author's Original Manuscript of an article whose final and definitive form, the Version of Record, has been published in the Journal of Sports Sciences, June 2012, copyright Taylor & Francis, available online at: http://www.tandfonline.com/10.1080/02640414.2012.682084.
Publication Title:	Journal of Sports Sciences
Creators:	Minshull, C., Eston, R., Rees, D. and Gleeson, N.
Publisher:	Taylor & Francis (Routledge)
Date:	2012
Volume:	30
Number:	10
ISSN:	1466-447X
Identifiers:	Number Type 10.1080/02640414.2012.682084 DOI
Rights:	© 2012 Routledge, Taylor & Francis Group, an Informa Business.
Divisions:	Schools > School of Science and Technology
Record created by:	EPrints Services
Date Added:	09 Oct 2015 09:42
Last Modified:	23 Aug 2016 09:05
URI:	https://irep.ntu.ac.uk/id/eprint/1514

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