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Influence of chronotype and social zeitgebers on sleep/wake patterns.
Braz J Med Biol Res. 2008 Oct; 41(10):914-9.BJ

Abstract

Inter-individual differences in the phase of the endogenous circadian rhythms have been established. Individuals with early circadian phase are called morning types; those with late circadian phase are evening types. The Horne and Ostberg Morningness-Eveningness Questionnaire (MEQ) is the most frequently used to assess individual chronotype. The distribution of MEQ scores is likely to be biased by several fact, ors, such as gender, age, genetic background, latitude, and social habits. The objective of the present study was to determine the effect of different social synchronizers on the sleep/wake cycle of persons with different chronotypes. Volunteers were selected from a total of 1232 UFPR undergraduate students who completed the MEQ. Thirty-two subjects completed the study, including 8 morning types, 8 evening types and 16 intermediate types. Sleep schedules were recorded by actigraphy for 1 week on two occasions: during the school term and during vacation. Sleep onset and offset times, sleep duration, and mid-sleep time for each chronotype group were compared by the Mann-Whitney U-test separately for school term and vacation. School term and vacation data were compared by the Wilcoxon matched-pair test. Morning types showed earlier sleep times and longer sleep duration compared with evening types (23:00 +/- 44 and 508.9 +/- 50.27 vs 01:08 +/- 61.95 and 456.44 +/- 59.08, for the weekdays during vacation). During vacation, the subjects showed later sleep times, except for the morning types, who did not exhibit differences for sleep onset times. The results support the idea that social schedules have an impact on the expression of circadian rhythmicity but this impact depends on the individual chronotype.

Authors+Show Affiliations

Setor de Ciências Biológicas, Departamento de Fisiologia, Universidade Federal do Paraná, Curitiba, PR, Brasil. annaligiak@yahoo.com.brNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18982197

Citation

Korczak, A L., et al. "Influence of Chronotype and Social Zeitgebers On Sleep/wake Patterns." Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas, vol. 41, no. 10, 2008, pp. 914-9.
Korczak AL, Martynhak BJ, Pedrazzoli M, et al. Influence of chronotype and social zeitgebers on sleep/wake patterns. Braz J Med Biol Res. 2008;41(10):914-9.
Korczak, A. L., Martynhak, B. J., Pedrazzoli, M., Brito, A. F., & Louzada, F. M. (2008). Influence of chronotype and social zeitgebers on sleep/wake patterns. Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas, 41(10), 914-9.
Korczak AL, et al. Influence of Chronotype and Social Zeitgebers On Sleep/wake Patterns. Braz J Med Biol Res. 2008;41(10):914-9. PubMed PMID: 18982197.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of chronotype and social zeitgebers on sleep/wake patterns. AU - Korczak,A L, AU - Martynhak,B J, AU - Pedrazzoli,M, AU - Brito,A F, AU - Louzada,F M, Y1 - 2008/09/30/ PY - 2007/11/08/received PY - 2008/08/29/accepted PY - 2008/11/5/pubmed PY - 2009/7/8/medline PY - 2008/11/5/entrez SP - 914 EP - 9 JF - Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologicas JO - Braz J Med Biol Res VL - 41 IS - 10 N2 - Inter-individual differences in the phase of the endogenous circadian rhythms have been established. Individuals with early circadian phase are called morning types; those with late circadian phase are evening types. The Horne and Ostberg Morningness-Eveningness Questionnaire (MEQ) is the most frequently used to assess individual chronotype. The distribution of MEQ scores is likely to be biased by several fact, ors, such as gender, age, genetic background, latitude, and social habits. The objective of the present study was to determine the effect of different social synchronizers on the sleep/wake cycle of persons with different chronotypes. Volunteers were selected from a total of 1232 UFPR undergraduate students who completed the MEQ. Thirty-two subjects completed the study, including 8 morning types, 8 evening types and 16 intermediate types. Sleep schedules were recorded by actigraphy for 1 week on two occasions: during the school term and during vacation. Sleep onset and offset times, sleep duration, and mid-sleep time for each chronotype group were compared by the Mann-Whitney U-test separately for school term and vacation. School term and vacation data were compared by the Wilcoxon matched-pair test. Morning types showed earlier sleep times and longer sleep duration compared with evening types (23:00 +/- 44 and 508.9 +/- 50.27 vs 01:08 +/- 61.95 and 456.44 +/- 59.08, for the weekdays during vacation). During vacation, the subjects showed later sleep times, except for the morning types, who did not exhibit differences for sleep onset times. The results support the idea that social schedules have an impact on the expression of circadian rhythmicity but this impact depends on the individual chronotype. SN - 1414-431X UR - https://www.unboundmedicine.com/medline/citation/18982197/Influence_of_chronotype_and_social_zeitgebers_on_sleep/wake_patterns_ L2 - https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008005000047&lng=en&nrm=iso&tlng=en DB - PRIME DP - Unbound Medicine ER -