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Chronobiological characterization of women with primary vasospastic syndrome : body heat loss capacity in relation to sleep initiation and phase of entrainment

Vollenweider, S. and Wirz-Justice, A. and Flammer, J. and Orgül, S. and Kräuchi, K.. (2008) Chronobiological characterization of women with primary vasospastic syndrome : body heat loss capacity in relation to sleep initiation and phase of entrainment. American journal of physiology. Regulatory, Integrative and Comparative Physiology, Vol. 294, H. 2 , R630-R638.

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Official URL: http://edoc.unibas.ch/dok/A6006595

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Abstract

Women with primary vasospastic syndrome (VS), but otherwise healthy, exhibit a functional disorder of vascular regulation (main symptom: cold extremities) and often suffer from difficulties initiating sleep (DIS). Diverse studies have shown a close association between distal vasodilatation before lights off and a rapid onset of sleep. Therefore, we hypothesized that DIS in women with VS could be due to a reduced heat loss capacity in the evening, i.e., subjects are physiologically not ready for sleep. The aim of the study was to elucidate whether women having both VS and DIS (WVD) or not (controls) show different circadian characteristics (e.g., phase delay of the circadian thermoregulatory system with respect to the sleep-wake cycle). Healthy young women (n = 9 WVD and n = 9 control) completed a 40-h constant routine protocol (adjusted to habitual bedtime) before and after an 8-h sleep episode. Skin temperatures [off-line calculated as distal-proximal skin temperature gradient (DPG)] and core body temperature (CBT; rectal) were continuously recorded. Half-hourly saliva samples were collected for melatonin assay and subjective sleepiness was assessed on the Karolinska Sleepiness Scale (KSS). Compared with control, WVD showed no differences in habitual bed times, but a 1-h circadian phase delay of dim light-melatonin onset (hours after lights on: WVD 14.6 +/- 0.3 h; control 13.5 +/- 0.2 h; P = 0.01). Similar phase shifts were observed in CBT, DPG, and KSS ratings. In conclusion, WVD exhibit a phase delay of the endogenous circadian system with respect to their habitual sleep-wake cycle, which could be a cause of DIS.
Faculties and Departments:03 Faculty of Medicine > Bereich Psychiatrie (Klinik) > Erwachsenenpsychiatrie UPK > Erwachsenenpsychiatrie (Lang)
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Psychiatrie (Klinik) > Erwachsenenpsychiatrie UPK > Erwachsenenpsychiatrie (Lang)
03 Faculty of Medicine > Bereich Spezialfächer (Klinik) > Ehemalige Einheiten Spezialfächer (Klinik) > Ophthalmologie (Flammer)
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Spezialfächer (Klinik) > Ehemalige Einheiten Spezialfächer (Klinik) > Ophthalmologie (Flammer)
03 Faculty of Medicine > Bereich Spezialfächer (Klinik) > Ophthalmologie USB > Ophthalmologie (Orgül)
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Spezialfächer (Klinik) > Ophthalmologie USB > Ophthalmologie (Orgül)
UniBasel Contributors:Wirz-Justice, Anna and Flammer, Josef and Orgül, Selim
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Physiological Society
ISSN:0002-9513
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:08 Nov 2013 08:28
Deposited On:08 Nov 2013 08:28

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