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- Title
Anodal transcranial direct current stimulation does not influence the neural adjustments associated with fatiguing contractions in a hand muscle.
- Authors
Abdelmoula, Achraf; Baudry, Stéphane; Duchateau, Jacques
- Abstract
<bold>Purpose: </bold>The objective of the current study was to investigate the mechanisms responsible for the briefer time to failure of a submaximal contraction (C2) when performed 60 min after a similar contraction (C1), and the influence of anodal transcranial direct current stimulation (a-tDCS) applied over the motor cortex on these mechanisms.<bold>Methods: </bold>In two sessions, ten adults sustained two isometric contractions (35% of maximum) to failure with the abductor pollicis brevis (APB). Before C2, either a-tDCS or sham stimulation was applied over the motor cortex. Fatigue-related changes in Hoffmann (H) and long-latency (LLR) reflexes, motor-evoked potential (MEP) induced by transcranial magnetic stimulation and associated silent period (SP), maximal motor wave (Mmax), voluntary activation (VA), electromyographic (EMG) activity and peak force (PT3) evoked by a 3 pulse-train (100 Hz) were investigated.<bold>Results: </bold>The results indicate that regardless of session, the time to failure was briefer (- 13%, p < 0.05) for C2 than C1, with no a-tDCS effect. During C1, MEP amplitude, SP duration and LLR amplitude increased, H-reflex amplitude did not change, and Mmax, VA and PT3 decreased (p < 0.05). Except for EMG activity that was greater during C2 than C1 (p < 0.001), all variables were similar in C1 and C2 (p > 0.05), and recovered their initial values after the 60-min rest, except PT3.<bold>Conclusions: </bold>The results of the current study indicate that a-tDCS did not influence corticospinal excitability and time to failure of C2 when performed with the APB. These observations may reflect a peripheral origin of the briefer C2 time to failure in the APB.
- Subjects
TRANSCRANIAL direct current stimulation; MUSCLE contraction; TRANSCRANIAL magnetic stimulation; MOTOR cortex; FRONTAL lobe; HAND physiology; SKELETAL muscle physiology; ELECTRIC stimulation; EVOKED potentials (Electrophysiology); MUSCLE fatigue; PHYSIOLOGY
- Publication
European Journal of Applied Physiology, 2019, Vol 119, Issue 3, p597
- ISSN
1439-6319
- Publication type
journal article
- DOI
10.1007/s00421-018-4027-4