European Journal of Applied Physiology

, Volume 115, Issue 5, pp 1107–1115 | Cite as

Differential modulation of motor cortex plasticity in skill- and endurance-trained athletes

  • Susanne Kumpulainen
  • Janne Avela
  • Markus Gruber
  • Julian Bergmann
  • Michael Voigt
  • Vesa Linnamo
  • Natalie Mrachacz-Kersting
Original Article

Abstract

Purpose

Extensive evidence exists that regular physical exercise offers neuroplastic benefits to the brain. In this study, exercise-specific effects on motor cortex plasticity were compared between 15 skilled and 15 endurance trained athletes and 8 controls.

Methods

Plasticity was tested with a paired associative stimulation (PAS) protocol. PAS is a non-invasive stimulation method developed to induce bidirectional changes in the excitability of the cortical projections to the target muscles. Motor cortex excitability was assessed by motor-evoked potentials (MEPs) in the task-relevant soleus muscle, elicited with transcranial magnetic stimulation, before and following PAS. To test for changes at the spinal level, soleus short latency stretch reflexes (SLSR) were elicited before and after PAS.

Results

PAS induced a significant (76 ± 83 %) increase in MEP amplitude in the skill group, without significant changes in the endurance (−7 ± 35 %) or control groups (21 ± 30 %). Baseline MEP/post MEP ratio was significantly different between the skill and endurance groups. SLSR remained unchanged after the PAS intervention.

Conclusion

The possible reason for differential motor cortex plasticity in skill and endurance groups is likely related to the different training-induced adaptations. The findings of the current study suggest that long-term skill training by skill group induced preferable adaptations in the task-related areas of the motor cortex because increased plasticity is known to enhance motor learning.

Keywords

Physical activity Training adaptation Motor cortex Brain plasticity Paired associative stimulation 

Abbreviations

EMG

Electromyography

LTP

Long-term potentiation

MEP

Motor-evoked potential

MVC

Maximal voluntary contraction

PAS

Paired associative stimulation

RMT

Resting motor threshold

SLSR

Short latency stretch reflex

TMS

Transcranial magnetic stimulation

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Susanne Kumpulainen
    • 1
    • 2
  • Janne Avela
    • 2
  • Markus Gruber
    • 3
  • Julian Bergmann
    • 3
  • Michael Voigt
    • 1
  • Vesa Linnamo
    • 2
  • Natalie Mrachacz-Kersting
    • 1
  1. 1.Department of Health Science and Technology, Center for Sensory-Motor Interaction (SMI)Aalborg UniversityAalborgDenmark
  2. 2.Department of Biology of Physical Activity, Neuromuscular Research CenterUniversity of JyväskyläJyväskyläFinland
  3. 3.Department of Sport ScienceUniversity of KonstanzKonstanzGermany

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