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Transcranial direct current stimulation improves isometric time to exhaustion of the knee extensors.
Neuroscience 2016; 339:363-375N

Abstract

Transcranial direct current stimulation (tDCS) can increase cortical excitability of a targeted brain area, which may affect endurance exercise performance. However, optimal electrode placement for tDCS remains unclear. We tested the effect of two different tDCS electrode montages for improving exercise performance. Nine subjects underwent a control (CON), placebo (SHAM) and two different tDCS montage sessions in a randomized design. In one tDCS session, the anodal electrode was placed over the left motor cortex and the cathodal on contralateral forehead (HEAD), while for the other montage the anodal electrode was placed over the left motor cortex and cathodal electrode above the shoulder (SHOULDER). tDCS was delivered for 10min at 2.0mA, after which participants performed an isometric time to exhaustion (TTE) test of the right knee extensors. Peripheral and central neuromuscular parameters were assessed at baseline, after tDCS application and after TTE. Heart rate (HR), ratings of perceived exertion (RPE), and leg muscle exercise-induced muscle pain (PAIN) were monitored during the TTE. TTE was longer and RPE lower in the SHOULDER condition (P<0.05). Central and peripheral parameters, and HR and PAIN did not present any differences between conditions after tDCS stimulation (P>0.05). In all conditions maximal voluntary contraction (MVC) significantly decreased after the TTE (P<0.05) while motor-evoked potential area (MEP) increased after TTE (P<0.05). These findings demonstrate that SHOULDER montage is more effective than HEAD montage to improve endurance performance, likely through avoiding the negative effects of the cathode on excitability.

Authors+Show Affiliations

Endurance Research Group, School of Sport and Exercise Sciences, University of Kent, Chatham Maritime, UK.Laboratoire INSERM U1093, Université de Bourgogne, Dijon, France.Endurance Research Group, School of Sport and Exercise Sciences, University of Kent, Chatham Maritime, UK.Endurance Research Group, School of Sport and Exercise Sciences, University of Kent, Chatham Maritime, UK.Endurance Research Group, School of Sport and Exercise Sciences, University of Kent, Chatham Maritime, UK. Electronic address: l.mauger@kent.ac.uk.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27751960

Citation

Angius, L, et al. "Transcranial Direct Current Stimulation Improves Isometric Time to Exhaustion of the Knee Extensors." Neuroscience, vol. 339, 2016, pp. 363-375.
Angius L, Pageaux B, Hopker J, et al. Transcranial direct current stimulation improves isometric time to exhaustion of the knee extensors. Neuroscience. 2016;339:363-375.
Angius, L., Pageaux, B., Hopker, J., Marcora, S. M., & Mauger, A. R. (2016). Transcranial direct current stimulation improves isometric time to exhaustion of the knee extensors. Neuroscience, 339, pp. 363-375. doi:10.1016/j.neuroscience.2016.10.028.
Angius L, et al. Transcranial Direct Current Stimulation Improves Isometric Time to Exhaustion of the Knee Extensors. Neuroscience. 2016 Dec 17;339:363-375. PubMed PMID: 27751960.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Transcranial direct current stimulation improves isometric time to exhaustion of the knee extensors. AU - Angius,L, AU - Pageaux,B, AU - Hopker,J, AU - Marcora,S M, AU - Mauger,A R, Y1 - 2016/10/14/ PY - 2016/06/27/received PY - 2016/10/07/revised PY - 2016/10/07/accepted PY - 2016/11/5/pubmed PY - 2017/11/7/medline PY - 2016/11/5/entrez KW - brain stimulation KW - exercise KW - performance KW - tDCS SP - 363 EP - 375 JF - Neuroscience JO - Neuroscience VL - 339 N2 - Transcranial direct current stimulation (tDCS) can increase cortical excitability of a targeted brain area, which may affect endurance exercise performance. However, optimal electrode placement for tDCS remains unclear. We tested the effect of two different tDCS electrode montages for improving exercise performance. Nine subjects underwent a control (CON), placebo (SHAM) and two different tDCS montage sessions in a randomized design. In one tDCS session, the anodal electrode was placed over the left motor cortex and the cathodal on contralateral forehead (HEAD), while for the other montage the anodal electrode was placed over the left motor cortex and cathodal electrode above the shoulder (SHOULDER). tDCS was delivered for 10min at 2.0mA, after which participants performed an isometric time to exhaustion (TTE) test of the right knee extensors. Peripheral and central neuromuscular parameters were assessed at baseline, after tDCS application and after TTE. Heart rate (HR), ratings of perceived exertion (RPE), and leg muscle exercise-induced muscle pain (PAIN) were monitored during the TTE. TTE was longer and RPE lower in the SHOULDER condition (P<0.05). Central and peripheral parameters, and HR and PAIN did not present any differences between conditions after tDCS stimulation (P>0.05). In all conditions maximal voluntary contraction (MVC) significantly decreased after the TTE (P<0.05) while motor-evoked potential area (MEP) increased after TTE (P<0.05). These findings demonstrate that SHOULDER montage is more effective than HEAD montage to improve endurance performance, likely through avoiding the negative effects of the cathode on excitability. SN - 1873-7544 UR - https://www.unboundmedicine.com/medline/citation/27751960/Transcranial_direct_current_stimulation_improves_isometric_time_to_exhaustion_of_the_knee_extensors_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0306-4522(16)30558-9 DB - PRIME DP - Unbound Medicine ER -