Heavy-resistance exercise-induced increases in jump performance are not explained by changes in neuromuscular function

Thomas, Kevin, Toward, Alan, West, Dan, Howatson, Glyn and Goodall, Stuart (2017) Heavy-resistance exercise-induced increases in jump performance are not explained by changes in neuromuscular function. Scandinavian Journal Of Medicine & Science In Sports, 27 (1). pp. 35-44. ISSN 0905-7188

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Official URL: http://dx.doi.org/10.1111/sms.12626

Abstract

Post-activation potentiation (PAP) is the increased involuntary muscle twitch response to stimulation following strong contraction. The enhancement to whole-body explosive muscular performance (PE) after heavy-resistance exercise is often attributed to modulations in neuromuscular function that are proposed to reflect PAP, but the evidence to support this is equivocal. We assessed the neuromuscular basis of PE using transcranial magnetic stimulation (TMS) of the primary motor cortex, and electrical stimulation of the femoral nerve. Eleven male athletes performed heavy-resistance exercise with measures of countermovement jump (CMJ) pre- and 8 min post-exercise. Pre-exercise and after the final CMJ, single- and paired-pulse TMS were delivered during submaximal isometric-knee-extensor contractions to measure corticospinal excitability, short-interval intracortical inhibition (SICI) and intracortical facilitation (ICF), with motor evoked potentials recorded from rectus femoris. Twitch responses to motor nerve stimulation during and post- maximum-knee-extensor contractions were studied to quantify voluntary activation (VA) and potentiated twitch (Qtw,pot). The experimental protocol successfully induced PE (+4±1% change in CMJ, P=0.01), but no changes were observed for maximum voluntary force, VA, corticospinal excitability, SICI or ICF (all P>0.05), and Qtw,pot declined (P<0.001). An enhancement of muscular performance after heavy resistance exercise was not accompanied by PAP, or changes in measures of neuromuscular function.

Item Type: Article
Additional Information: This is the peer reviewed version of the following article: Heavy-resistance exercise-induced increases in jump performance are not explained by changes in neuromuscular function, which has been published in final form at [http://dx.doi.org/10.1111/sms.12626]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > School of Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Kevin Thomas
Date Deposited: 21 Dec 2015 14:08
Last Modified: 13 Jun 2017 01:16
URI: http://nrl.northumbria.ac.uk/id/eprint/25143

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