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Increased cross-education of muscle strength and reduced corticospinal inhibition following eccentric strength training

Kidgell, Dawson J., Frazer, Ashlyn K., Daly, Robin M., Rantalainen, Timo, Ruotsalainen, Ilona, Ahtiainen, Juha, Avela, Janne and Howatson, Glyn 2015, Increased cross-education of muscle strength and reduced corticospinal inhibition following eccentric strength training, Neuroscience, vol. 300, pp. 566-575, doi: 10.1016/j.neuroscience.2015.05.057.

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Title Increased cross-education of muscle strength and reduced corticospinal inhibition following eccentric strength training
Author(s) Kidgell, Dawson J.
Frazer, Ashlyn K.
Daly, Robin M.ORCID iD for Daly, Robin M. orcid.org/0000-0002-9897-1598
Rantalainen, TimoORCID iD for Rantalainen, Timo orcid.org/0000-0001-6977-4782
Ruotsalainen, Ilona
Ahtiainen, Juha
Avela, Janne
Howatson, Glyn
Journal name Neuroscience
Volume number 300
Start page 566
End page 575
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-08-06
ISSN 0306-4522
1873-7544
Keyword(s) corticospinal inhibition
cross-activation
cross-transfer
ipsilateral motor cortex
recovery
strength
Summary AIM: Strength training of one limb results in a substantial increase in the strength of the untrained limb, however, it remains unknown what the corticospinal responses are following either eccentric or concentric strength training and how this relates to the cross-education of strength. The aim of this study was to determine if eccentric or concentric unilateral strength training differentially modulates corticospinal excitability, inhibition and the cross-transfer of strength. METHODS: Changes in contralateral (left limb) concentric strength, eccentric strength, motor-evoked potentials, short-interval intracortical inhibition and silent period durations were analyzed in groups of young adults who exercised the right wrist flexors with either eccentric (N=9) or concentric (N=9) contractions for 12 sessions over 4weeks. Control subjects (N=9) did not train. RESULTS: Following training, both groups exhibited a significant strength gain in the trained limb (concentric group increased concentric strength by 64% and eccentric group increased eccentric strength by 62%) and the extent of the cross-transfer of strength was 28% and 47% for the concentric and eccentric group, respectively, which was different between groups (P=0.031). Transcranial magnetic stimulation revealed that eccentric training reduced intracortical inhibition (37%), silent period duration (15-27%) and increased corticospinal excitability (51%) compared to concentric training for the untrained limb (P=0.033). There was no change in the control group. CONCLUSION: The results show that eccentric training uniquely modulates corticospinal excitability and inhibition of the untrained limb to a greater extent than concentric training. These findings suggest that unilateral eccentric contractions provide a greater stimulus in cross-education paradigms and should be an integral part of the rehabilitative process following unilateral injury to maximize the response.
Language eng
DOI 10.1016/j.neuroscience.2015.05.057
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 929999 Health not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2015, Elsevier
Free to Read? No
Free to Read Start Date 2016-08-27
Persistent URL http://hdl.handle.net/10536/DRO/DU:30073809

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