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1

DAILY RHYTHM OF MOOD IN DIFFERENT CHRONOTYPES

100%
Jankowski K.
Psychological Studies
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2007
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vol. 45
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issue 4
17-24
EN
This article is concerned with mood level rhythm over the day. In the study mood was measured in the course of a day using the UMACL scale and the participants' chronotype was assessed. Daily variation was found in all three mood dimensions, but each had its specific course. Morning hours turned out to be especially disadvantageous in terms of the hedonic tone and tense arousal levels. Energetic arousal exhibited the highest values at midday in the morning type subjects and in the evening in the evening type subjects. The results suggest that from the chronopsychological point of view it was justified to distinguish the three mood dimensions. Another very important conclusion is that the hour of measurement should be controlled for each of the three mood dimensions both in further research and in psychological practice.
2

CHRONOTYPE: BIOLOGICAL BASIS AND CORRELATES

100%
Fronczyk K., Dragan W. L.
Psychologia-Etologia-Genetyka
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2006
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vol. 14
31-57
EN
This paper reviews selected biological correlates and determinants of chronotype. The diurnal types are known to differ in some parameters (mainly acrophase and nadir) of many physiological circadian rhythms such as body temperature, melatonin and cortisol secretion and cardiovascular system activity. These various characteristics of circadian rhythms reflect differences between time-of-day dependent level of arousal different for morning or evening preference. One of the manifestations of the differences in circadian changes of the level of cortical arousal typical for evening or morning preference is the interaction between chronotype and time of day of auditory and visual evoked potentials amplitude. Morning and evening types differ not only in circadian aspect of functioning but in electroencephalographic parameters of sleep. The energy of slow waveforms of sleep of evening types is higher comparing to morning types. Evening types spend less time in REM sleep also. These facts are interpreted as indicators of higher homeostatic sleep need in evening types. One of the sources of individual differences in chronotype is the level of physical maturation. Prepubertal adolescents are more morning-oriented than matured adolescents. The controversial data describing naturally occurring benzodiazepines influence on chronotype was also mentioned. The genetic basis of chronotype was discussed as the last part of the article.
3

AN ASSOCIATION BETWEEN WOMENS' TEMPERAMENT AND CHRONOTYPE AT DIFFERENT TIME CHOSEN FOR PHYSICAL ACTIVITY

100%
Olek M.
Psychologia-Etologia-Genetyka
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2007
|
vol. 16
49-61
EN
The aim of the study presented in this paper was to investigate an association between womens' temperament and chronotype and the time chosen for physical activity. One hundred and eleven women aged from 18 to 55 were participated in present research. The Formal Characteristics of Behavior - Temperament Inventory (FCB-TI) was used to measure temperament features. To assess kind of chronotype all participants completed Horne-Östberg's Morningness-Eveningness Questionaire, named the Rhythm of Daily Activity Questionnaire (KRAD) in Polish version. The data analysis has shown that morning types were more brisk (Tau Kendall = 0, 17; p = 0,01), less perseverative (Tau Kendall = - 0,20; p = 0,00) and more sensory sensitive (Tau Kendall = 0,15; p = 0,03) when compared with evening types. There was also negative correlation between perseveration and the result in KRAD in the group of women who chose physical fitness activity in the morning (Tau Kendall = - 0,28; p = 0,01) and positive correlation between briskness and the result in KRAD in the group of women who chose physical fitness activity in the evening (Tau Kendall = 0,20; p = 0,03).
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