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      Catalepsia induzida pelo lactato e atividade muscular forçada em ratos privados de sono

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          Abstract

          O estudo comparativo das homologias comportamentais é útil para a compreensão de diferentes aspectos dos transtornos psiquiátricos. Nesta perspectiva, o presente estudo avaliou os efeitos da privação de sono REM sobre a catalepsia. Ratos privados de sono REM por 4 dias foram submetidos à administração i.p. de lactato 10mM/Kg e exercício muscular forçado, sendo, então a catalepsia avaliada. O grupo de animais privados de sono mostrou menor incidência (50%) de animais com catalepsia e média do tempo total de catalepsia menor (11,92 ± 4,12 minutos) em relação aos controles (91,7% e 26,67 ± 5,86 min respectivamente), com significâncias estatísticas no limite (p=0,05). Conclui-se que, em uma situação de perigo prolongado, a catalepsia é disparada em uma segunda instância, após o esgotamento do repertório de enfrentamentos normais da vigília, e que o sono só é compensado após o término da situação de risco.

          Translated abstract

          Catalepsy induced by lactate administration and forced muscular activity in rats. Comparative studies of behavioral homologies help understand several aspects of psychiatric disorders. The present study evaluated the effect of REM-sleep deprivation on the catalepsy induced by lactate administration plus forced muscular activity. Rats deprived of REM-sleep for 96 hs were injected i.p. with lactate solution 10mM/kg and submitted to 5 minutes of forced muscular activity. Catalepsy was then evaluated. The number of animals displaying catalepsy (50%) and mean total catalepsy time (11,92 ± 4,12 minutes) were lower in sleep deprived animals than in controls (91.7% and 26.67 ± 5.86 min respectively), results being statistically significant at the limit level (p=0,05). It is concluded that in long lasting dangerous situations, catalepsy may be triggered after normal wakefulness coping possibilities are exhausted, and sleep being manifested only when the risk situation is over.

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          Most cited references42

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          The effect of dream deprivation.

          W Dement (1960)
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            Learned helplessness in the rat.

            Four experiments attempted to produce behavior in the rat parallel to the behavior characteristic of learned helplessness in the dog. When rats received escapable, inescapable, or no shock and were later tested in jump-up escape, both inescapable and no-shock controls failed to escape. When bar pressing, rather than jumping up, was used as the tested escape response, fixed ratio (FR) 3 was interfered with by inescapable shock, but not lesser ratios. With FR-3, the no-shock control escaped well. Interference with escape was shown to be a function of the inescapability of shock and not shock per se: Rats that were "put through" and learned a prior jump-up escape did not become passive, but their yoked, inescapable partners did. Rats, as well as dogs, fail to escape shock as a function of prior inescapability, exhibiting learned helplessness.
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              Neurophysiology of the states of sleep.

              M Jouvet (1967)
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                Author and article information

                Journal
                reto
                Revista de Etologia
                Rev. etol.
                Sociedade Brasileira de Etologia (São Paulo, SP, Brazil )
                1517-2805
                2175-3636
                January 2010
                : 9
                : 1
                : 7-15
                Affiliations
                [01] orgnameUniversidade Estadual Paulista
                Article
                S1517-28052010000100002 S1517-2805(10)00900102
                3893e20d-da92-4ce2-b56b-c230663a644c

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 21 March 2008
                : 20 September 2009
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 43, Pages: 9
                Product

                SciELO Periódicos Eletrônicos em Psicologia

                Categories
                Artigos

                Ratos,Sono,Comportamento de defesa,Catalepsia,Rats,Sleep,Defensive behavior,Catalepsy

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