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2019/08/24

体を鍛えることと脳との関係

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J Appl Physiol (1985). 2019 Aug 22. doi: 10.1152/japplphysiol.01106.2018. [Epub
ahead of print]

Contraction intensity-dependent variations in the responses to brain and
corticospinal tract stimulation after a single session of resistance training in 
men.

Colomer-Poveda D(1), Romero-Arenas S(1), Lundbye-Jensen J(2), Hortobágyi T(3),
Márquez G(1).

Author information: 
(1)Departament of Sport Sciences, CATHOLIC UNIVERSITY OF MURCIA (UCAM), Spain.
(2)Department of Neuroscience & Pharmacology and Department of Nutrition,
Exercise and Sports, University of Copenhagen, Denmark.
(3)Center for Human Movement Sciences, University of Groningen, University
Medical Center, Netherlands.

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.

DOI: 10.1152/japplphysiol.01106.2018 
PMID: 31436513 

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