Sleep Dependent Effect of Dark Pulses on Sleep in Albino and Pigmented Rats

Ling-Ling Tsai

dark ； light ； REM sleep ； NREM sleep ； albino rats ； pigmentation

The Chinese Journal of Physiology

48卷2期（2005 / 06 / 01）

72 - 78

英文

Light-to-dark transitions have been found to enhance paradoxical sleep (PS) in albino rats but not pigmented rats. Furthermore, PS inducing effect of dark pulses in albino rats depends on sleep states. This study examined whether the relationship between PS and preceding non-rapid-eye-movement sleep (NREMS) in pigmented Brown Norway rats was different from that in albino F344 rats and whether such a difference was associated with different responses to dark pulses in the two rat strains. Both rat strains showed a positive relationship between PS and preceding NREMS. However, only the albino F344 rats exhibited the PS inducing effect of dark pulses. Dark pulses did not alter the relationship between PS and preceding NREMS in either rat strain, and, reciprocally, nor did duration of preceding NREMS affect dark pulse-induced PS enhancement. Furthermore, this study verified that dark pulses given during NREMS in albino F344 rats specifically induced the suppression of NREMS concomitant with the enhancement of PS. This study proposed that dark pulses might inhibit NREMS and facilitate PS regulating areas concurrently in albino rats.

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