Sound signal processing signifies an important factor for human conscious communication and it may be assessed through cortical auditory evoked potentials (CAEP). Heart rate variability (HRV) provides information about heart rate autonomic regulation. We investigated the association between resting HRV and CAEP. We evaluated resting HRV in the time and frequency domain and the CAEP components. The subjects remained at rest for 10 minutes for HRV recording, then they performed the CAEP examinations through frequency and duration protocols in both ears. Linear regression indicated that the amplitude of the N2 wave of the CAEP in the left ear (not right ear) was significantly influenced by standard deviation of normal-to-normal RR-intervals (17.7%) and percentage of adjacent RR-intervals with a difference of duration greater than 50 milliseconds (25.3%) time domain HRV indices in the frequency protocol. In the duration protocol and in the left ear the latency of the P2 wave was significantly influenced by low (LF) (20.8%) and high frequency (HF) bands in normalized units (21%) and LF/HF ratio (22.4%) indices of HRV spectral analysis. The latency of the N2 wave was significantly influenced by LF (25.8%), HF (25.9%) and LF/HF (28.8%). In conclusion, we promote the supposition that resting heart rhythm is associated with thalamo-cortical, cortical-cortical and auditory cortex pathways involved with auditory processing in the right hemisphere.
Introdução: Medidas psicofisiológicas do sistema nervoso autônomo em resposta a tarefas auditivas podem fornecer um meio de quantificar os efeitos do esforço auditivo. Objetivo: Comparar a modulação parassimpática da frequência cardíaca em situações de escuta distintas e determinar se a variabilidade da frequência cardíaca (VFC) é um índice psicofisiológico sensível para mensurar o esforço auditivo. Método: Estudo piloto, observacional, transversal e prospectivo. Participaram 14 adultos normo-ouvintes, de ambos os sexos e com idade entre 18 e 30 anos. Estes responderam a anamnese e realizaram audiometria tonal limiar para verificação de limiares auditivos. Para o registro da VFC, colocou-se a cinta do cardiofrequencímetro na região do processo xifoide e este registro foi coletado por 10 minutos para três situações distintas: “repouso”, “recuperação pós-reconhecimento de sentenças no silêncio” e “recuperação pós-reconhecimento de sentenças no ruído”. O reconhecimento de sentenças foi realizado utilizando-se duas listas de sentenças, de forma randomizada, binaural, nas situações de escuta silêncio e na relação sinal/ruído de -5 dB e, também foi registrada VFC por um período de dois minutos. Aplicou-se o teste de ANOVA de medidas repetidas seguido pelo pós-teste de Bonferroni para comparar o índice de RMSSD nos diferentes momentos de registro da VFC. Resultados: A análise estatística demonstrou que não houve diferença significante do registro da VFC nos diferentes momentos, inclusive durante a tarefa de reconhecimento de sentenças no ruído, considerada a tarefa mais árdua. Conclusão: Para esta amostra, o registro da VFC não foi considerado um índice sensível para a mensuração do esforço auditivo.
Cortical auditory evoked potentials (CAEP) throughout a language task is beneficial during psychophysiological evaluation to advance identification of language disorders. So as to better comprehend human communication and to provide additional elements for neuropsychological examinations we aimed to (1) examine the influence of language tasks on cortical auditory processing and vagal control of heart rate and (2) to verify a possible association between the parasympathetic cardiac regulation and cortical auditory processing in language tasks. This study was completed with 49 women. The subjects were separated into two groups: (1) phonological language tasks (N = 21) and (2) semantic (N = 21) language tasks. Heart rate variability (HRV) and CAEP were evaluated before and after the tests. HRV reduced (small effect size) and P3 wave latency increased after the phonological task. Identical variables were significantly correlated after the phonological task and linear regression indicated significant interaction between pNN50 (percentage of adjacent RR intervals with a difference of duration greater than 50 milliseconds) and P3 latency (16.9%). In conclusion, phonological language tasks slightly reduced parasympathetic control of HR and increased cognitive effort. The association between HRV and CAEP are anticipated to be involved in this mechanism.
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