Navegando por Autor "Azevedo, Carolina V. M."
Agora exibindo 1 - 2 de 2
- Resultados por página
- Opções de Ordenação
Artigo Circadian activity rhythm in pre-pubertal and pubertal marmosets (callithrix jacchus) living in family groups(Elsevier, 2016) Melo, Paula R.; Gonçalves, Bruno S. B.; Menezes, Alexandre A. L.; Azevedo, Carolina V. M.In marmosets, a phase advancewas observed in activity onset in pubertal animals living in captivity under seminatural conditions which had stronger correlation with the times of sunrise over the course of the year than the age of the animal. In order to evaluate the effect of puberty on the circadian activity rhythm in male and female marmosets living in family groups in controlled lighting conditions, the activity of 5 dyads of twins (4 ♀/♂and 1 ♂/♂) and their respective parents was continuously monitored by actiwatches between the 4th and 12th months of age. The families were kept under LD 12:12 h with constant humidity and temperature. The onset of puberty was identified by monitoring fecal steroids. Juveniles showed higher totals of daily activity and differences in the daily distribution of activity in relation to parents, in which the bimodal profile was characterized by higher levels in evening activity in relation to morning activity. Regarding the phase, the activity onset and offset, occurred later in relation to parents. After entering puberty, the activity onset and offset occurred later and there was an increase in total daily activity. On the other hand, when assessing the effect of sex, only females showed a delay in the activity offset and an increase in total daily activity. Therefore, the circadian activity rhythmin marmosets has peculiar characteristics in the juvenile stage in relation to the total of daily activity, the onset and offset of the active phase, and the distribution of activity during this phase. Besides, the entering puberty was associated with a phase delay and increase on total daily activity, with differences between sexes, possibly due to hormonal influences and/or social modulation on rhythmArtigo Sleep–wake cycle, daytime sleepiness, and attention components in children attending preschool in the morning and afternoon shifts(Wiley, 2016) Belísio, Aline S.; Kolodiuk, Fernanda F.; Louzada, Fernando M.; Valdez, Pablo; Azevedo, Carolina V. M.Children tend to sleep and wake up early and to exhibit daytime sleep episodes. To evaluate the impact of school start times on sleepiness and attention in preschool children, this study compared the temporal patterns of sleep, daytime sleepiness, and the components of attention between children aged 4–6 years that study in the morning (n=66) and the afternoon (n=144) shifts. The former get up 1 hr and 30 min earlier on weekdays and show lower efficiency on the sustained attention task than those who study inthe afternoon.Thus, themorning shiftwas associatedwith a reduction in nighttime sleep, which might have a negative effect on children’s performance in themorning, causing higher levels of daytime sleepiness and a decline in sustained attention. Because only one parameter of one component of attention was negatively affected, further studies are needed to confirm this effect on cognition