The effect of paired associative stimulation on fatigue resistance

•On average, fatigue resistance did not change after PAS interventions.•PAS-induced excitability changes correlated with changes in fatigue resistance.•PAS might have affected central fatigue during short maximal contractions. Paired associative stimulation (PAS) is a non-invasive stimulation method...

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Bibliographic Details
Published in:Neuroscience research 2015-06, Vol.95, p.59-65
Main Authors: Kumpulainen, Susanne, Peltonen, Jussi, Gruber, Markus, Cresswell, Andrew, Peurala, Sinikka, Linnamo, Vesa, Avela, Janne
Format: Article
Language:English
Subjects:
Adult
Central fatigue
Evoked Potentials, Motor
Fatigue
Female
Humans
Male
Motor cortex
Motor Cortex - physiology
Muscle Fatigue
Muscle, Skeletal - physiology
Neuronal Plasticity
Paired associative stimulation
Transcranial magnetic stimulation
Transcranial Magnetic Stimulation - methods
Young Adult
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Summary:•On average, fatigue resistance did not change after PAS interventions.•PAS-induced excitability changes correlated with changes in fatigue resistance.•PAS might have affected central fatigue during short maximal contractions. Paired associative stimulation (PAS) is a non-invasive stimulation method developed to induce bidirectional changes in the excitability of the cortical projections to the target muscles. However, very few studies have shown an association between changes in motor evoked potentials (MEP) after PAS and behavioral changes in healthy subjects. In the present study we hypothesized that the functional relevance of PAS can be seen during fatiguing exercise, since there is always a central contribution to the development of fatigue. Transcranial magnetic stimulation was applied over the motor cortex to measure changes in the MEPs of the soleus muscle before and after PAS. Furthermore, fatigue resistance was tested during 15s sustained maximal isometric contractions before and after PAS. On average, fatigue resistance did not change after PAS, however the change in excitability correlated significantly with the change in fatigue resistance. Discussion: Functionality of PAS intervention was not demonstrated in this study. However, the observed relationship between excitability and fatigue resistance suggests that PAS might have affected central fatigue during short maximal contractions.
ISSN:0168-0102
1872-8111
DOI:10.1016/j.neures.2015.01.015