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PRELIMINARY ANALYSIS OF THE CIRCADIAN RHYTHM IN A REPRESENTATIVE SAMPLE OF THE POPULATION OF SÃO PAULO: DIFFERENCE IN ACTIVITY ACROPHASE BETWEEN AGE GROUPS
São Paulo is the largest city in Brazil, with an estimated population of 12 million inhabitants. The lifestyle of its residents, considered chaotic, impacts their sleep and well-being, becoming a public health issue. The epidemiological study of sleep in the city of São Paulo (EPISONO) has been carried out since 1986 and aims to tracing the epidemiological sleep profile of São Paulo residents. Considering that sleep and rhythm information about this population is little known, this study is of great importance to generate knowledge and provide information that allows the implementation of public policies focusing in quality of sleep and well-being. Here we present partial results on the difference in activity acrophase among age groups of EPISONO 2018 participants.
To verify the difference in the activity acrophase of different age groups participating in the EPISONO 2018 study.
A total of 637 participants obtained valid actigraphy records. The rhythmicity data of 158 participants were analyzed until now. The sample consisted of 90 women and 68 men, aged between 20 and 78 years. Ages were categorized into 6 groups of 10 years: 20 to 29 years (n=25); from 30 to 39 years (n=34); from 40 to 49 years (n=33); from 50 to 59 years (n=31); from 60 to 69 years (n=24); from 70 to 80 years (n=11). Data normality and homogeneity were verified by the Shapiro-Wilk and Levene tests. The comparison of activity between groups was performed by analysis of variance (ANOVA). Post-hoc analysis was performed by Tukey HSD test.
One-way ANOVA showed that there was a significant difference in the activity acrophase between groups (p=0.003), being the 20-to-29-year group with later acrophase (16h11±2h03) compared to the other groups ([30,39]=15h32±1h49; [40, 49]=15h25±2h00; [50, 59=14h27±1h33; [60, 69]=14h31±1h45; [70, 80]=14h03±1h24). The post-hoc analysis pointed that there was a significant difference in the 20-29 age group compared to the others ([40, 49] p=0.0043; [50, 59] p=0.0062; [60, 69] p=0.189; [70, 80] p=0.170, except for individuals aged from 30 to 39 years (p>0.05).
The partial results indicated a marked difference in peak activity between ages. In our sample, younger participants, from 20 to 29 years, had later activity acrophase concerning the other age groups. Together with subsequent analysis of rhythmicity, these data will generate information that can positively contribute to public health.
sleep, rest-activity, actigraphy, acrophase, epidemiology.
Universidade Federal de São Paulo - São Paulo - Brasil
Pâmela Caroline Silva, Catharina Maria Carvalho Scassola, Julia Ribeiro Silva Vallim, Monica Levy Andersen, Sergio Tufik, Vânia D'Almeida