Neuroethologic differences in sleep deprivation induced by the single- and multiple-platform methods

Neuroethologic differences in sleep deprivation induced by the single- and multiple-platform methods

Autor Medeiros, Regina Bitelli Autor UNIFESP Google Scholar
Lenneberg-Hoshino, C. Google Scholar
Hoshino, Katsumasa Google Scholar
Tufik, Sergio Autor UNIFESP Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Universidade Estadual Paulista (UNESP)
Resumo It has been proposed that the multiple-platform method (MP) for desynchronized sleep (DS) deprivation eliminates the stress induced by social isolation and by the restriction of locomotion in the single-platform (SP) method. MP, however, induces a higher increase in plasma corticosterone and ACTH levels than SP. Since deprivation is of heuristic value to identify the functional role of this state of sleep, the objective of the present study was to determine the behavioral differences exhibited by rats during sleep deprivation induced by these two methods. All behavioral patterns exhibited by a group of 7 albino male Wistar rats submitted to 4 days of sleep deprivation by the MP method (15 platforms, spaced 150 mm apart) and by 7 other rats submitted to sleep deprivation by the SP method were recorded in order to elaborate an ethogram. The behavioral patterns were quantitated in 10 replications by naive observers using other groups of 7 rats each submitted to the same deprivation schedule. Each quantification session lasted 35 min and the behavioral patterns presented by each rat over a period of 5 min were counted. The results obtained were: a) rats submitted to the MP method changed platforms at a mean rate of 2.62 ± 1.17 platforms h-1 animal-1; b) the number of episodes of noninteractive waking patterns for the MP animals was significantly higher than that for SP animals (1077 vs 768); c) additional episodes of waking patterns (26.9 ± 18.9 episodes/session) were promoted by social interaction in MP animals; d) the cumulative number of sleep episodes observed in the MP test (311) was significantly lower (chi-square test, 1 d.f., P<0.05) than that observed in the SP test (534); e) rats submitted to the MP test did not show the well-known increase in ambulatory activity observed after the end of the SP test; f) comparison of 6 MP and 6 SP rats showed a significantly shorter latency to the onset of DS in MP rats (7.8 ± 4.3 and 29.0 ± 25.0 min, respectively; Student t-test, P<0.05). We conclude that the social interaction occurring in the MP test generates additional stress since it increases the time of forced wakefulness and reduces the time of rest promoted by synchronized sleep.
Palavra-chave sleep deprivation methods
stress
social interactions
group crowding effects
Idioma Inglês
Data de publicação 1998-05-01
Publicado em Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 31, n. 5, p. 675-680, 1998.
ISSN 0100-879X (Sherpa/Romeo, fator de impacto)
Publicador Associação Brasileira de Divulgação Científica
Extensão 675-680
Fonte http://dx.doi.org/10.1590/S0100-879X1998000500012
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000073802500012
SciELO S0100-879X1998000500012 (estatísticas na SciELO)
Endereço permanente http://repositorio.unifesp.br/handle/11600/620

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