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Relationship between motor corticospinal excitability and ventilatory response during intense exercise

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Title: Relationship between motor corticospinal excitability and ventilatory response during intense exercise
Authors: Yunoki, Takahiro Browse this author →KAKEN DB
Matsuura, Ryouta Browse this author
Yamanaka, Ryo Browse this author
Afroundeh, Roghayyeh Browse this author
Lian, Chang-shun Browse this author
Shirakawa, Kazuki Browse this author
Ohtsuka, Yoshinori Browse this author
Yano, Tokuo Browse this author
Keywords: Control of breathing
Muscle glycogen
Central command
Effort sense
Issue Date: Jun-2016
Publisher: Springer
Journal Title: European journal of applied physiology
Volume: 116
Issue: 6
Start Page: 1117
End Page: 1126
Publisher DOI: 10.1007/s00421-016-3374-2
PMID: 27055665
Abstract: Purpose Effort sense has been suggested to be involved in the hyperventilatory response during intense exercise (IE). However, the mechanism by which effort sense induces an increase in ventilation during IE has not been fully elucidated. The aim of this study was to determine the relationship between effort-mediated ventilatory response and corticospinal excitability of lower limb muscle during IE. Eight subjects performed 3 min of cycling exercise at 75-85 % of maximum workload twice (IE1st and IE2nd). IE2nd was performed after 60 min of resting recovery following 45 min of submaximal cycling exercise at the workload corresponding to ventilatory threshold. Vastus lateralis muscle response to transcranial magnetic stimulation of the motor cortex (motor evoked potentials, MEPs), effort sense of legs (ESL, Borg 0-10 scale), and ventilatory response were measured during the two IEs. The slope of ventilation (l/min) against CO2 output (l/min) during IE2nd (28.0 +/- 5.6) was significantly greater than that (25.1 +/- 5.5) during IE1st. Mean ESL during IE was significantly higher in IE2nd (5.25 +/- 0.89) than in IE1st (4.67 +/- 0.62). Mean MEP (normalized to maximal M-wave) during IE was significantly lower in IE2nd (66 +/- 22 %) than in IE1st (77 +/- 24 %). The difference in mean ESL between the two IEs was significantly (p < 0.05, r = -0.82) correlated with the difference in mean MEP between the two IEs. The findings suggest that effort-mediated hyperventilatory response to IE may be associated with a decrease in corticospinal excitability of exercising muscle.
Type: article (author version)
Appears in Collections:教育学院・教育学研究院 (Graduate School of Education / Faculty of Education) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 柚木 孝敬

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