Task‐specific strength increases after lower‐limb compound resistance training occurred in the absence of corticospinal changes in vastus lateralis

Ansdell, Paul, Brownstein, Callum, Škarabot, Jakob, Angius, Luca, Kidgell, Dawson, Frazer, Ashlyn, Hicks, Kirsty, Durbaba, Rade, Howatson, Glyn, Goodall, Stuart and Thomas, Kevin (2020) Task‐specific strength increases after lower‐limb compound resistance training occurred in the absence of corticospinal changes in vastus lateralis. Experimental Physiology, 105 (7). pp. 1132-1150. ISSN 0958-0670

[img]
Preview
Text (Final published version)
EP088629.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (3MB) | Preview
[img]
Preview
Text (Advance online version)
EP088629.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (3MB) | Preview
Official URL: https://doi.org/10.1113/EP088629

Abstract

Neural adaptations subserving strength increases have been shown to be task‐specific, but responses and adaptation to lower‐limb compound exercises such as the squat are commonly assessed in a single‐limb isometric task. This two‐part study assessed neuromuscular responses to an acute bout (Study A) and 4 weeks (Study B) of squat resistance training at 80% of one‐repetition‐maximum, with measures taken during a task‐specific isometric squat (IS) and non‐specific isometric knee extension (KE). Eighteen healthy volunteers (25 ± 5 years) were randomised into either a training (n = 10) or a control (n = 8) group. Neural responses were evoked at the intracortical, corticospinal and spinal levels, and muscle thickness was assessed using ultrasound. The results of Study A showed that the acute bout of squat resistance training decreased maximum voluntary contraction (MVC) for up to 45 min post‐exercise (−23%, P < 0.001). From 15–45 min post‐exercise, spinally evoked responses were increased in both tasks (P = 0.008); however, no other evoked responses were affected (P ≥ 0.240). Study B demonstrated that following short‐term resistance training, participants improved their one repetition maximum squat (+35%, P < 0.001), which was reflected by a task‐specific increase in IS MVC (+49%, P = 0.001), but not KE (+1%, P = 0.882). However, no training‐induced changes were observed in muscle thickness (P = 0.468) or any evoked responses (P = 0.141). Adjustments in spinal motoneuronal excitability are evident after acute resistance training. After a period of short‐term training, there were no changes in the responses to central nervous system stimulation, which suggests that alterations in corticospinal properties of the vastus lateralis might not contribute to increases in strength.

Item Type: Article
Uncontrolled Keywords: adaptation, corticospinal excitability, exercise, intracortical inhibition, squat
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Elena Carlaw
Date Deposited: 26 May 2020 12:02
Last Modified: 01 Jul 2020 09:15
URI: http://nrl.northumbria.ac.uk/id/eprint/43245

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics