Temporal sleep patterns in adults using actigraph.
The aim of the present study was to characterize the temporal patterns of sleep and wakefulness in a sample of the adult subjects from São Paulo city. All subjects filled the Morningness/Eveningness Questionnaire (MEQ) and wore an actigraph for at least three consecutive days. A total of 359 subjects were considered for the analyses. The mean age was 43±14 years, the mean body mass index was 26.7±5.7 kg/m(2), and 60% were female. The mean MEQ score was 58.0±10.7. The sleep pattern evaluated by the actigraphic analyses showed that 92% had a monophasic sleep pattern, 7% biphasic, and 1% polyphasic sleep pattern. Cluster analysis, based on time to sleep onset, sleep efficiency, sleep latency, and total sleep time, was able to identify three different groups denominated: morning type, evening type, and undefined type. Morning type subjects were more frequent, older, and had higher MEQ scores than evening type subjects. Our results showed that the actigraph objectively assessed the sleep-wake cycle and was able to discriminate between morning and evening type individuals. These findings suggest that the actigraph could be a valuable tool for assessing temporal sleep patterns, including the circadian preferences.
Departamento de Psicobiologia, Universidade Federal de São Paulo. Rua Napoleão de Barros 925, CEP 04024-002, São Paulo/SP, Brazil.
Lia
L
Matuzaki
Environmental Health Department, School of Public Health, University of São Paulo. Av. Dr. Arnaldo 715, CEP 01246-904, São Paulo/SP, Brazil.
Rogerio
R
Santos-Silva
Environmental Health Department, School of Public Health, University of São Paulo. Av. Dr. Arnaldo 715, CEP 01246-904, São Paulo/SP, Brazil.
Elaine Cristina
EC
Marqueze
Environmental Health Department, School of Public Health, University of São Paulo. Av. Dr. Arnaldo 715, CEP 01246-904, São Paulo/SP, Brazil.
Claudia Roberta
CR
de Castro Moreno
Departamento de Psicobiologia, Universidade Federal de São Paulo. Rua Napoleão de Barros 925, CEP 04024-002, São Paulo/SP, Brazil.
Sergio
S
Tufik
Departamento de Psicobiologia, Universidade Federal de São Paulo. Rua Napoleão de Barros 925, CEP 04024-002, São Paulo/SP, Brazil.
Lia
L
Bittencourt
Actigraph; Circadian preferences; Eveningness; Morningness; Sleep-wake pattern; Temporal patterns