Effect of transcranial direct current stimulation upon the physical performance: analysis of cerebral, metabolic and perceptual responses during and after aerobic and strength exercises
| Autor: | Montenegro, Rafael Ayres |
|---|---|
| Přispěvatelé: | Farinatti, Paulo de Tarso Veras, Deslandes, Andréa Camaz, Oliveira, Ricardo Brandão de, Gurgel, Jonas Lírio, Machado, Sergio Eduardo de Carvalho |
| Jazyk: | portugalština |
| Rok vydání: | 2015 |
| Předmět: |
Córtex pré-frontal
Desempenho físico Córtex motor - Fisiologia Reabilitação física Córtex pré-frontal - Fisiologia Prefrontal cortex Physical rehabilitation Córtex motor Fadiga central Physical performance Brain stimulation Estimulação cerebral Motor cortex CIENCIAS BIOLOGICAS::FISIOLOGIA::FISIOLOGIA DO ESFORCO [CNPQ] Fadiga muscular - Fisiologia Central fatigue Estimulação Transcraniana por Corrente Contínua |
| Zdroj: | Biblioteca Digital de Teses e Dissertações da UERJ Universidade do Estado do Rio de Janeiro (UERJ) instacron:UERJ |
| Popis: | Submitted by Boris Flegr (boris@uerj.br) on 2021-01-06T20:54:05Z No. of bitstreams: 1 Rafael Ayres Montenegro Tese completa.pdf: 2240966 bytes, checksum: 37f9e460d97670c2905289ea5a746a44 (MD5) Made available in DSpace on 2021-01-06T20:54:05Z (GMT). No. of bitstreams: 1 Rafael Ayres Montenegro Tese completa.pdf: 2240966 bytes, checksum: 37f9e460d97670c2905289ea5a746a44 (MD5) Previous issue date: 2015-09-30 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Transcranial direct current stimulation (tDCS) applied over pre-selected cortical areas, has been shown to improve the physical performance of different population. However, gaps persist regarding the mechanisms that underlie this effect. Thus, the present tesis aimed: a) to investigate the effects of anodal tDCS (atDCS) and sham condition over motor cortex (MC) in healthy subjects upon maximal strength performance; b) to compare the tDCS effects upon either maximal strength production and force steadiness during maximal and submaximal exercise in hemiparetic and healthy groups; c) to investigate the tDCS effect upon the inter-hemispheric functional connectivity (electroencephalographic coherence cEEG) of prefrontal cortex (PFC), aerobic fitness and energy expenditure (EE) during and after maximal and submaximal exercise bouts. In the 1st study, 14 healthy adults performed 2 maximal strength exercise sessions (MSEX) of flexor and extensor muscles in the dominant knee (3 sets of 10 max repetitions) preceded by atDCS or sham condition (2mA; 20 min). atDCS was not able to increase neither the total work or peak torque (PT), fatigue resistance or electromiografic activity during MSEX. In the 2nd study, 10 hemiparetic and 9 healthy subjects received atDCS or sham condition over MC. The PT and the force steadiness (coefficient of variation CV) were assessed during the maximal and submaximal protocol involving unilateral knee flexion and extension (1 set of 3 reps at 100%PT and 2 sets of 10 reps at 50%PT). No differences in PT were observed in both groups. CV decreasing were observed during knee extension (~25-35%, P0.05). PFC cEEG increased after atDCS vs. baseline (0.70±0.40 vs. 0.38±0.05; P=0.001), but not after sham condition vs.baseline (0.36±0.49 vs. 0.33±0.50; P=0,06) which suggest that atDCS might delays fatigue increasing the PFC inter-hemispheric connectivity and aerobic fitness during exhaustive exercise. In the 4th study, the VO2 and the EE were assessed in 11 healthy subjects before, during atDCS over PFC or sham condition and 30-min following isocaloric aerobic exercise (~200kcal). No differences were observed on VO2 vs. baseline during atDCS and sham condition (P=0.95 and P=0.85). However, the association between aerobic exercise and atDCS increased the EE in ~19% after at least 30 min of recovery after exercise compared with sham condition (P0,05). A cEEG do CPF aumentou após aETCC vs. repouso (0.70±0.40 vs. 0.38±0.05; P=0,001), mas não após Sham vs. repouso (0.36±0.49 vs. 0.33±0.50; P=0,06), sugerindo que a aETCC pode retardar a fadiga aumentando a conectividade funcional entre os hemisférios do CPF e desempenho aeróbio durante exercício exaustivo. No 4º estudo, o VO2 e EE foram avaliados em 11 adultos saudáveis antes, durante a aETCC ou Sham no CPF e 30 min após exercício aeróbio submáximo isocalórico (~200kcal). Diferenças não foram observadas no VO2 vs. repouso durante aETCC e Sham (P=0.95 e P=0.85). Porém, a associação entre exercício e aETCC aumentou em ~19% o EE após ao menos, 30 min de recuperação após exercício quando comparada a Sham (P |
| Databáze: | OpenAIRE |
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