A1 Journal article (refereed)
Corticospinal and intracortical excitability is modulated in the knee extensors after acute strength training (2022)
Alibazi, R. J., Frazer, A. K., Pearce, A. J., Tallent, J., Avela, J., & Kidgell, D. J. (2022). Corticospinal and intracortical excitability is modulated in the knee extensors after acute strength training. Journal of Sports Sciences, 40(5), 561-570. https://doi.org/10.1080/02640414.2021.2004681
JYU authors or editors
Publication details
All authors or editors: Alibazi, Razie J.; Frazer, Ashlyn K.; Pearce, Alan J.; Tallent, Jamie; Avela, Janne; Kidgell, Dawson J.
Journal or series: Journal of Sports Sciences
ISSN: 0264-0414
eISSN: 1466-447X
Publication year: 2022
Publication date: 19/11/2021
Volume: 40
Issue number: 5
Pages range: 561-570
Publisher: Routledge
Publication country: United Kingdom
Publication language: English
DOI: https://doi.org/10.1080/02640414.2021.2004681
Publication open access: Not open
Publication channel open access:
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/84380
Abstract
The corticospinal responses to high-intensity and low-intensity strength-training of the upper limb are modulated in an intensity-dependent manner. Whether an intensity-dependent threshold occurs following acute strength training of the knee extensors (KE) remains unclear. We assessed the corticospinal responses following high-intensity (85% of maximal strength) or low-intensity (30% of maximal strength) KE strength-training with measures taken during an isometric KE task at baseline, post-5, 30 and 60-min. Twenty-eight volunteers (23 ± 3 years) were randomized to high-intensity (n = 11), low-intensity (n = 10) or to a control group (n = 7). Corticospinal responses were evoked with transcranial magnetic stimulation at intracortical and corticospinal levels. High- or low-intensity KE strength-training had no effect on maximum voluntary contraction force post-exercise (P > 0.05). High-intensity training increased corticospinal excitability (range 130–180%) from 5 to 60 min post-exercise compared to low-intensity training (17–30% increase). Large effect sizes (ES) showed that short-interval cortical inhibition (SICI) was reduced only for the high-intensity training group from 5–60 min post-exercise (24–44% decrease) compared to low-intensity (ES ranges 1–1.3). These findings show a training-intensity threshold is required to adjust CSE and SICI following strength training in the lower limb.
Keywords: strength training; muscle strength; training response; neuromuscular activity; neuroplasticity; cerebral cortex
Free keywords: corticospinal excitability; exercise; intracortical inhibition; knee extension; maximal strength
Contributing organizations
Ministry reporting: Yes
VIRTA submission year: 2022
JUFO rating: 1
