Sleep and wake in rhythmic vs arrhythmic chronotypes of a microphthalmic species of African mole rat (Cryptomys mechowi)

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dc.contributor.author Bhagwandin, Adhil
dc.contributor.author Gravett, Nadine
dc.contributor.author Lyamin, Oleg I.
dc.contributor.author Oosthuizen, Maria Kathleen
dc.contributor.author Bennett, Nigel C., 1961-
dc.contributor.author Siegel, Jerome M.
dc.contributor.author Manger, Paul R.
dc.date.accessioned 2012-08-13T07:05:19Z
dc.date.available 2012-08-13T07:05:19Z
dc.date.issued 2011
dc.description.abstract The giant Zambian molerat (Cryptomys mechowi) is a subterranean African rodent noted for its regressed visual system and unusual patterns of circadian rhythmicity – within this species some individuals exhibit distinct regular circadian patterns while others have arrhythmic circadian patterns. The current study was aimed at understanding whether differences in circadian chronotypes in this species affects the patterns and proportions of the different phases of the sleep-wake cycle. Physiological parameters of sleep (EEG and EMG) and behaviour (video recording) were recorded continuously for 72 h from six mole rats (three rhythmic and three arrhythmic) using a telemetric system and a low light CCTV camera connected to a DVD recorder. The telemetric data was scored (in both 5 s and 1 min epochs) as wake, nonREM sleep (NREM) and rapid eye movement (REM) stages subject to the correlation between EEG, EMG and behaviour. Spectral power was calculated for EEG in each implanted individual, which assisted in understanding the sleep phases and the intensity of NREM between the chronotypes. In addition REM periodicity was calculated from which sleep cycle length was inferred. The results indicate that the arrhythmic individuals spend more time in waking with a longer average duration of a waking episode, less time in NREM with a shorter average duration of a NREM episode though a greater nonREM sleep intensity, and similar sleep cycle lengths. The time spent in REM and the average duration of a REM episode was similar between the chronotypes. en
dc.description.librarian ab2012 en
dc.description.uri http://content.karger.com/ProdukteDB/produkte.asp?Aktion=JournalHome&ProduktNr=223831 en
dc.identifier.citation Bhagwandin, A, Gravett, N, Lyamin, OI, Oothuizen MK, Bennett, ND, Siegel, JM & Manger, PR 2012, ' Sleep and wake in rhythmic vs arrhythmic chronotypes of a microphthalmic species of African mole rat (Cryptomys mechowi)', Brain, Behaviour & Evolution, vol. 78, no. 2, pp. 162-183. en
dc.identifier.issn 0006-8977 (print)
dc.identifier.issn 1421-9743 (online)
dc.identifier.other 10.1159/000330360
dc.identifier.uri http://hdl.handle.net/2263/19587
dc.language.iso en en
dc.publisher Karger en
dc.rights © 2012 S. Karger AG, Basel en
dc.subject nonREM sleep (NREM) en
dc.subject Rapid eye movement (REM) en
dc.subject African mole-rats (Bathyergidae) en
dc.subject.lcsh Bathyergidae en
dc.subject.lcsh Circadian rhythms en
dc.subject.lcsh Sleep-wake cycle en
dc.title Sleep and wake in rhythmic vs arrhythmic chronotypes of a microphthalmic species of African mole rat (Cryptomys mechowi) en
dc.type Postprint Article en


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