The knowns and unknowns of neural adaptations to resistance training

Jakob Škarabot, Callum Brownstein, Andrea Casolo, Alessandro Del Vecchio, Paul Ansdell*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

4 Citations (Scopus)
12 Downloads (Pure)

Abstract

The initial increases in force production with resistance training are thought to be primarily underpinned by neural adaptations. This notion is firmly supported by evidence displaying motor unit adaptations following resistance training; however, the precise locus of neural adaptation remains elusive. The purpose of this review is to clarify and critically discuss the literature concerning the site(s) of putative neural adaptations to short-term resistance training. The proliferation of studies employing non-invasive stimulation techniques to investigate evoked responses have yielded variable results, but generally support the notion that resistance training alters intracortical inhibition. Nevertheless, methodological inconsistencies and the limitations of techniques, e.g. limited relation to behavioural outcomes and the inability to measure volitional muscle activity, preclude firm conclusions. Much of the literature has focused on the corticospinal tract; however, preliminary research in non-human primates suggests reticulospinal tract is a potential substrate for neural adaptations to resistance training, though human data is lacking due to methodological constraints. Recent advances in technology have provided substantial evidence of adaptations within a large motor unit population following resistance training. However, their activity represents the transformation of afferent and efferent inputs, making it challenging to establish the source of adaptation. Whilst much has been learned about the nature of neural adaptations to resistance training, the puzzle remains to be solved. Additional analyses of motoneuron firing during different training regimes or coupling with other methodologies (e.g. electroencephalography) may facilitate the estimation of the site(s) of neural adaptations to resistance training in the future.
Original languageEnglish
Pages (from-to)675–685
Number of pages11
JournalEuropean Journal of Applied Physiology
Volume121
Issue number3
Early online date23 Dec 2020
DOIs
Publication statusPublished - 1 Mar 2021

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