O EFEITO DO CONTROLE RESPIRATÓRIO EM VARIÁVEIS ELETROFISIOLÓGICAS DA ATENÇÃO

• Autor(a) principal: LOZANO, MIRNA DELPOSO
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da METODISTA
• Texto Completo: http://tede.metodista.br/jspui/handle/tede/1466
• topic: Eletroencefalografia; inspiração; expiração; atenção; Electroencephalography; inspiration; expiration; attention; CIENCIAS HUMANAS::PSICOLOGIA

The practice of yoga has become more popular increasingly not only for the physical benefits, but mostly for the psychological well-being brought by its practice. One of the components of yoga is Prãnãyama, or breath control. Attention and breathing are two physiological and involuntary mechanisms required for the implementation of Prãnãyama. The aim of this study was to determine whether continuous variables of EEG (power of different groups that compose it) would be modulated by the respiratory control, comparing both phases, inspiration and expiration, separately. The participants were 19 subjects (7 men/12 women, mean age 36.89, SD = ± 14.46), who were invited to participate in the research at the Faculdade de Saúde da Universidade Metodista de São Paulo. For the record of the EEG a positioning system of five electrodes Ag AgCl (Fpz, Fz, Cz, Pz and Oz) was used, fixed to a fast positioning cap (Quick-Cap, Neuromedical Supplies®) in 10-20 system. Maximum range of power values were obtained (power spectrum in the frequency domain) in theta frequencies, alpha, beta and delta and theta/beta ratio was calculated in the different phases of the respiratory cycle (inspiration and expiration), separately, in spontaneous breathing conditions and respiratory control. For the record of the respiratory cycle, a respiratory effort belt M01 (plethysmograph) was used. The results show significant differences between the conditions of spontaneous and controlled breathing with higher mean values of theta/beta ratio in the inspiration of spontaneous breathing than in controlled breathing, and mean values of alpha power higher in controlled breathing. Significant differences were found in the comparison between inspiration and expiration of controlled breathing with decreased values of the mean of theta/beta ratio in inspiration and an increase in mean values of alpha power in expiration. The findings of this study provide evidence that the respiratory control modulates electrophysiological variables related to attention, reflecting an alert status, but more relaxed compared to the spontaneous breathing situation.