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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The effects of total and REM sleep deprivation on laser-evoked potential threshold and pain perception

Texto completo
Autor(es):
Azevedo, Eduardo [1] ; Manzano, Gilberto M. [2] ; Silva, Andressa [1] ; Martins, Raquel [1] ; Andersen, Monica L. [1] ; Tufik, Sergio [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Fed Sao Paulo, Dept Psicobiol, Sao Paulo, SP - Brazil
[2] Univ Fed Sao Paulo, Dept Neurofisiol Clin, Sao Paulo, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Pain; v. 152, n. 9, p. 2052-2058, SEP 2011.
Citações Web of Science: 34
Resumo

We investigated the effects of total and rapid eye movement (REM) sleep deprivation on the thermal nociceptive threshold and pain perception using the objective laser-evoked potential (LEP) and the subjective visual analogue scale (VAS). Twenty-eight male adult volunteers were assigned into Control (CTRL), Total (T-SD), and REM (REM-SD) Sleep Deprivation groups. The T-SD and REM-SD volunteers were totally or selectively deprived of sleep for 2 and 4 consecutive nights, respectively. Pain parameters were measured daily during the experimental period. Volunteers were stimulated on the back of the hand by blocks of 50 diode laser pulses. Intensities increased between successive blocks, ranging from nonnoxious to noxious levels, and the LEP threshold was identified based on the evoked-response onset. Both the LEP threshold and VAS ratings were significantly increased after the second night of T-SD. No significant variations were observed in the REM-SD group, suggesting a predominant role for slow wave sleep rather than selective REM-SD in pain perception. Also, for both sleep-deprived groups, the mean values of the LEP threshold and VAS ratings showed a gradual increase that was proportional to the SD deprivation time, followed by a decrease after 1 night of sleep restoration. These findings demonstrate a hyperalgesic modification to pain perception (as reflected by the augmented VAS) and a concomitant increase in the LEP threshold following T-SD, an apparently contradictory effect that can be explained by differences in the ways that attention affects these pain measurements. (C) 2011 Published by Elsevier B.V. on behalf of International Association for the Study of Pain. (AU)

Processo FAPESP: 98/14303-3 - Center for Sleep Studies
Beneficiário:Sergio Tufik
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 06/03444-3 - Estudo do limiar da dor na vigília e no sono utilizando potencial evocado por laser
Beneficiário:Eduardo Azevedo Pacheco
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 06/58276-8 - Avaliação da densidade do transportador dopaminérgico utilizando [99mtc]-trodat e SPECT após privação de sono
Beneficiário:Raquel Cristina Martins da Silva
Linha de fomento: Bolsas no Brasil - Mestrado