Highlights
- •The simple rhythmic task transiently reduced MEP amplitudes.
- •The visuomotor task increased MEP amplitudes.
- •No MEP changes were observed following the adjustment task and the simple isometric task.
- •This study suggests that PED is induced by simple rhythmic movement.
Abstract
Post-exercise cortical depression (PED) is induced by non-fatiguing finger movement.
Because the type of exercise that causes PED remains unclear, we conducted two experiments
to clarify which exercise factors induce PED. Fifteen healthy participants performed
repetitive abduction movements of the right index finger at 2.0 Hz (simple rhythmic
task) and 0.2 Hz (adjustment task) for 6 min each in experiment 1. Twelve healthy
participants performed repetitive and isometric abduction contractions of the right
index finger at 1.0 Hz with visuomotor tracking (visuomotor task) and without visuomotor
tracking (simple isometric task) for 5 min each in experiment 2. Muscle contraction
levels were 10% of the maximum voluntary contraction in all tasks. Motor evoked potentials
(MEPs) evoked by transcranial magnetic stimulation were recorded from the right first
dorsal interosseous muscle before and after the movement tasks. The simple rhythmic
task transiently reduced MEP amplitudes when compared with baseline in experiment
1. In contrast, the visuomotor task increased MEP amplitudes in experiment 2. No MEP
changes were observed following the adjustment task in experiment 1 and the simple
isometric task in experiment 2. This study suggests that PED is induced by simple
rhythmic movement.
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Article info
Publication history
Published online: August 22, 2018
Accepted:
August 12,
2018
Received:
April 9,
2018
Identification
Copyright
© 2018 Elsevier Ltd. All rights reserved.
