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2 results on '"Zhanna N. Lopatskaya"'

1. The Irrecoverable Loss in Sleep on Weekdays of Two Distinct Chronotypes Can Be Equalized by Permitting a >2 h Difference in Waking Time

Author

Arcady A. Putilov, Dmitry S. Sveshnikov, Zarina V. Bakaeva, Elena B. Yakunina, Yuri P. Starshinov, Vladimir I. Torshin, Elena A. Trutneva, Michael M. Lapkin, Zhanna N. Lopatskaya, Roman O. Budkevich, Elena V. Budkevich, Elena L. Tinkova, Marina P. Dyakovich, Larisa P. Cherapkina, Olga G. Donskaya, Alexandra N. Puchkova, and Vladimir B. Dorokhov

Subjects
morningness–eveningness, two-process model, simulation, sleep–wake cycle, sleep timing, sleep duration, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999
Abstract

Background: Our work/study culture is biased towards the circadian clocks of “morning types”, whereas “evening types” are forced to advance their weekday waking times relative to weekend waking times. Since the experimental research consistently reveals a >2 h difference between these two chronotypes in the positions of their endogenous circadian phases, we hypothesized the necessity to permit a >2 h difference between them in weekday waking times to equalize their irrecoverable loss in sleep on weekdays. Methods: A total of 659 and 1106 participants of online surveys identified themselves as morning and evening types, respectively. The hypothesis was tested by applying a model of sleep–wake regulation for simulating sleep times reported by 245 lecturers of these two types, and by comparison of sleep times of these types among these lecturers and 1520 students. Results: The hypothesis was supported by results showing that, if, on weekdays, an “average” morning type wakes at 6 a.m., the equalization of the weekday sleep loss of the two chronotypes would require the waking time of an “average” evening type to be no earlier than 8 a.m. Conclusions: These results may be implemented in a model-based methodology for the correction of weekday waking times to equalize weekday sleep loss.

Published
2022
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2. Single-Item Chronotyping (SIC), a method to self-assess diurnal types by using 6 simple charts

Author

Zhanna N. Lopatskaya, V I Torshin, Michael M. Lapkin, Vladimir B. Dorokhov, Yuri P. Starshinov, Marina P. Dyakovich, Olga V. Sergeeva, Olga G. Donskaya, Elena V. Budkevich, Elena A. Trutneva, Zarina B. Bakaeva, Clara Colomb, Bérénice Delwiche, Arcady A. Putilov, Nikolay N. Alipov, Roman O. Budkevich, Olivier Mairesse, D. Neu, Elena B. Yakunina, D S Sveshnikov, Alexandra N. Puchkova, Juri Plusnin, Brussels University Consultation Center, Faculty of Psychology and Educational Sciences, Psychology, and Brain, Body and Cognition

Subjects
medicine.medical_specialty, Chronobiology, Evening, 05 social sciences, Diurnal temperature variation, Chronotype, Excessive daytime sleepiness, 050109 social psychology, Audiology, Single item, 050105 experimental psychology, Alertness, medicine, 0501 psychology and cognitive sciences, medicine.symptom, Psychology, General Psychology, Morning
Abstract

Research on individual differences in the fields of chronobiology and chronopsychology mostly focuses on two – morning and evening – chronotypes. However, recent developments in these fields pointed at a possibility to extend chronotypology beyond just two chronotypes. We examined this possibility by implementing the Single-Item Chronotyping (SIC) as a method for self-identification of chronotype among six simple chart options illustrating the daily change in alertness level. Of 2283 survey participants, 2176 (95%) chose one of these options. Only 13% vs. 24% chose morning vs. evening type (a fall vs. a rise of alertness from morning to evening), while the majority of participants chose four other types (with a peak vs. a dip of alertness in the afternoon and with permanently high vs. low alertness levels throughout the day, 15% vs. 18% and 9% vs. 16%, respectively). The same 6 patterns of diurnal variation in sleepiness were yielded by principal component analysis of sleepiness curves. Six chronotypes were also validated against the assessments of sleep timing, excessive daytime sleepiness, and abilities to wake or sleep on demand at different times of the day. We concluded that the study results supported the feasibility of classification with the 6 options provided by the SIC.

Published
2021
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