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Elbow flexor fatigue modulates central excitability of the knee extensors

Aboodarda, Saied Jalal, Copithorne, David B., Power, Kevin E., Drinkwater, Eric and Behm, David G. 2015, Elbow flexor fatigue modulates central excitability of the knee extensors, Applied physiology, nutrition and metabolism, vol. 40, no. 9, pp. 924-930, doi: 10.1139/apnm-2015-0088.

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Title Elbow flexor fatigue modulates central excitability of the knee extensors
Author(s) Aboodarda, Saied Jalal
Copithorne, David B.
Power, Kevin E.
Drinkwater, EricORCID iD for Drinkwater, Eric orcid.org/0000-0002-9594-9360
Behm, David G.
Journal name Applied physiology, nutrition and metabolism
Volume number 40
Issue number 9
Start page 924
End page 930
Total pages 7
Publisher NRC Research Press
Place of publication Ottawa, Ont.
Publication date 2015-09
ISSN 1715-5312
1715-5320
Keyword(s) cross-over fatigue
peripheral fatigue
motoneurone excitability
voluntary activation
Summary The present study investigated the effects of exercise-induced elbow flexor fatigue on voluntary force output, electromyographic (EMG) activity and motoneurone excitability of the nonexercised knee extensor muscles. Eleven participants attended 3 testing sessions: (i) control, (ii) unilateral fatiguing elbow flexion and (iii) bilateral fatiguing elbow flexion (BiFlex). The nonfatigued knee extensor muscles were assessed with thoracic motor evoked potentials (TMEPs), maximal compound muscle action potential (Mmax), knee extensor maximal voluntary contractions (MVCs), and normalized EMG activity before and at 30 s, 3 min, and 5 min postexercise. BiFlex showed significantly lower (Δ = -18%, p = 0.03) vastus lateralis (VL) normalized EMG activity compared with the control session whereas knee extension MVC force did not show any statistical difference between the 3 conditions (p = 0.12). The TMEP·Mmax-1 ratio measured at the VL showed a significantly higher value (Δ = +46%, p = 0.003) following BiFlex compared with the control condition at 30 s postexercise. The results suggest that the lower VL normalized EMG following BiFlex might have been due to a reduction in supraspinal motor output because spinal motoneuronal responses demonstrated substantially higher value (30 s postexercise) and peripheral excitability (compound muscle action potential) showed no change following BiFelex than control condition.
Language eng
DOI 10.1139/apnm-2015-0088
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 929999 Health not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, NRC Research Press
Persistent URL http://hdl.handle.net/10536/DRO/DU:30082922

Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
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