Contraction intensity-dependent variations in the responses to brain and corticospinal tract stimulation after a single session of resistance training in men
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Contraction intensity-dependent variations in the responses to brain and corticospinal tract stimulation after a single session of resistance training in men. / Colomer-Poveda, David; Romero-Arenas, Salvador; Lundbye-Jensen, Jesper; Hortobágyi, Tibor; Márquez, Gonzalo.
I: Journal of Applied Physiology, Bind 127, Nr. 4, 2019, s. 1128-1139.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Contraction intensity-dependent variations in the responses to brain and corticospinal tract stimulation after a single session of resistance training in men
AU - Colomer-Poveda, David
AU - Romero-Arenas, Salvador
AU - Lundbye-Jensen, Jesper
AU - Hortobágyi, Tibor
AU - Márquez, Gonzalo
N1 - CURIS 2019 NEXS 337
PY - 2019
Y1 - 2019
N2 - The aim of this study was to determine the effects of acute resistance training (RT) intensity on motor evoked potentials (MEPs) generated by transcranial magnetic brain stimulation and on cervicomedullary motor evoked potentials (CMEPs) produced by electrical stimulation of the corticospinal tract. In four experimental sessions, 14 healthy young men performed 12 sets of eight isometric contractions of the elbow flexors at 0 (Control session), 25, 50 and 75% of the maximal voluntary contraction (MVC). Before and after each session, MEPs, CMEPs, and the associated twitch forces were recorded at rest. MEPs increased by 39% (P < 0.05 vs. 25% and control condition, ES = 1.04 and 1.76 respectively) after the 50% session and by 70% (P < 0.05 vs. all other conditions, ES = 0.91 - 2.49) after the 75% session. In contrast, CMEPs increased similarly after the 25%, 50%, and 75% sessions with an overall increase of 27% (P < 0.05 vs. control condition, ES = 1.34). The amplitude of maximal compound muscle action potentials (Mmax) was unchanged during the experiment. The MEP- and CMEP-associated twitch forces also increased after RT, but training intensity affected only the increases in MEP twitch forces. The data tentatively suggest that the intensity of muscle contraction used in acute bouts of RT affects cortical excitability.
AB - The aim of this study was to determine the effects of acute resistance training (RT) intensity on motor evoked potentials (MEPs) generated by transcranial magnetic brain stimulation and on cervicomedullary motor evoked potentials (CMEPs) produced by electrical stimulation of the corticospinal tract. In four experimental sessions, 14 healthy young men performed 12 sets of eight isometric contractions of the elbow flexors at 0 (Control session), 25, 50 and 75% of the maximal voluntary contraction (MVC). Before and after each session, MEPs, CMEPs, and the associated twitch forces were recorded at rest. MEPs increased by 39% (P < 0.05 vs. 25% and control condition, ES = 1.04 and 1.76 respectively) after the 50% session and by 70% (P < 0.05 vs. all other conditions, ES = 0.91 - 2.49) after the 75% session. In contrast, CMEPs increased similarly after the 25%, 50%, and 75% sessions with an overall increase of 27% (P < 0.05 vs. control condition, ES = 1.34). The amplitude of maximal compound muscle action potentials (Mmax) was unchanged during the experiment. The MEP- and CMEP-associated twitch forces also increased after RT, but training intensity affected only the increases in MEP twitch forces. The data tentatively suggest that the intensity of muscle contraction used in acute bouts of RT affects cortical excitability.
KW - Faculty of Science
KW - Cervicomedullary motor evoked potentials
KW - Cortical excitability
KW - Motor evoked potentials
KW - Plasticity
KW - Strength training
U2 - 10.1152/japplphysiol.01106.2018
DO - 10.1152/japplphysiol.01106.2018
M3 - Journal article
C2 - 31436513
VL - 127
SP - 1128
EP - 1139
JO - Journal of Applied Physiology
JF - Journal of Applied Physiology
SN - 8750-7587
IS - 4
ER -
ID: 226825698