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The time-course of acute changes in corticospinal excitability, intra-cortical inhibition and facilitation following a single-session heavy strength training of the biceps brachii

Latella, Christopher, Hendy, Ashlee M., Pearce, Alan J., VanderWesthuizen, Dan and Teo, Wei-Peng 2016, The time-course of acute changes in corticospinal excitability, intra-cortical inhibition and facilitation following a single-session heavy strength training of the biceps brachii, Frontiers in human neuroscience, vol. 10, Article number: 607, pp. 1-9, doi: 10.3389/fnhum.2016.00607.

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Title The time-course of acute changes in corticospinal excitability, intra-cortical inhibition and facilitation following a single-session heavy strength training of the biceps brachii
Author(s) Latella, Christopher
Hendy, Ashlee M.
Pearce, Alan J.
VanderWesthuizen, Dan
Teo, Wei-PengORCID iD for Teo, Wei-Peng orcid.org/0000-0003-3929-9778
Journal name Frontiers in human neuroscience
Volume number 10
Season Article number: 607
Start page 1
End page 9
Total pages 9
Publisher Frontiers Media
Place of publication Lausanne, Switzerland
Publication date 2016-12-01
ISSN 1662-5161
Keyword(s) transcranial magnetic stimulation
corticospinal excitability
intra-cortical inhibition
intra-cortical facilitation
super-compensation
strength training
Summary Objective: The current understanding of acute neurophysiological responses to resistance training remains unclear. Therefore, we aimed to compare the time-course of acute corticospinal responses following a single-session heavy strength training (HST) of the biceps brachii (BB) muscle and provide quantifiable evidence based on the super-compensation model in an applied setting.

Methods: Fourteen participants completed a counter-balanced, cross-over study that consisted of a single HST session (5 sets × 3 repetition maximum [RM]) of the BB and a control session (CON). Single- and paired-pulse transcranial magnetic stimulation (TMS) was used to measure changes in motor-evoked potential (MEP) amplitude, intra-cortical facilitation (ICF), short-interval intra-cortical inhibition (SICI) and long-interval intra-cortical inhibition (LICI). Additionally, maximal muscle compound wave (MMAX) and maximal voluntary isometric contraction (MVIC) of the BB were taken. All measures were taken at baseline, immediately post and at 10, 20, 30 min and 1, 2, 6, 24, 48 and 72 h post-training.

Results: A significant reduction in MEP amplitude was observed immediately post training (P = 0.001), while MVIC (P < 0.001) and MMAX (P = 0.047) were reduced for up to 30 min post-training. An increase in MVIC (p < 0.001) and MMAX (p = 0.047) was observed at 6 h, while an increase in MEP amplitude (p = 0.014) was only observed at 48 and 72 h. No changes in SICI, ICF and LICI were observed.

Conclusion: Our results suggest that: (1) acute changes in corticospinal measures returned to baseline in a shorter timeframe than the current super-compensation model (24-48 h) and (2) changes in corticospinal excitability post-HST may be modulated "downstream" of the primary motor cortex (M1).
Language eng
DOI 10.3389/fnhum.2016.00607
Field of Research 110602 Exercise Physiology
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30090619

Document type: Journal Article
Collections: School of Exercise and Nutrition Sciences
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.