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NUITFRANCE - Bibliothèque - Fiche bibliographique
Bibliothèque
Cette rubrique recense :
- de la documentation sur les différents thèmes de la nuit (vie nocturne, pollution lumineuse, pollution sonore, ...).
- les données informatiques relatives à l'éclairage public digitalisées et mises à dispositions en open data par certaines communes,
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Quelques tags associés : [ DOCUMENTATION, PUBLICATIONS, LITTÉRATURE, CONNAISSANCES, LITTÉRATURE GRISE, ARTICLES DE PRESSE, ARTICLES SCIENTIFIQUES, TEXTES JURIDIQUES, PLANS ET PROGRAMMES, JURISPRUDENCE, DÉCRETS, THÈSES ]
► Fiche bibliographique
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Document " Biological Rhythms During Residence in Polar Regions "
Type de document : |
Articles de revue scientifique |
Thème du document : |
Nuit naturelle - Rythmes biologiques |
Groupe biologique : |
Etres humains |
Auteur(s) : |
ARENDT J.
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Date de publication : |
Mai 2012 |
Langue : |
English/Anglais |
Nom du périodique : |
Chronobiology International |
Précisions : |
Volume 29. Numéro 4. Pages 379–394 |
Lien contenu/source : |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC379327... |
DOI : |
10.3109/07420528.2012.668997 |
Mots-clefs : |
Antarctic
Arctic
Circadian
Light
Melatonin
Polar
Sleep
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Citation courte : |
Arendt (2012) |
Citation complète (format NuitFrance) : |
ARENDT J. (2012). Biological Rhythms During Residence in Polar Regions. Chronobiology International. Volume 29. Numéro 4. Pages 379–394. |
Résumé du document : |
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At Arctic and Antarctic latitudes, personnel are deprived of natural sunlight in winter and have continuous daylight in summer: light of sufficient intensity and suitable spectral composition is the main factor that maintains the 24-h period of human circadian rhythms. Thus, the status of the circadian system is of interest. Moreover, the relatively controlled artificial light conditions in winter are conducive to experimentation with different types of light treatment. The hormone melatonin and/or its metabolite 6-sulfatoxymelatonin (aMT6s) provide probably the best index of circadian (and seasonal) timing. A frequent observation has been a delay of the circadian system in winter. A skeleton photoperiod (2 × 1-h, bright white light, morning and evening) can restore summer timing. A single 1-h pulse of light in the morning may be sufficient. A few people desynchronize from the 24-h day (free-run) and show their intrinsic circadian period, usually >24 h. With regard to general health in polar regions, intermittent reports describe abnormalities in various physiological processes from the point of view of daily and seasonal rhythms, but positive health outcomes are also published. True winter depression (SAD) appears to be rare, although subsyndromal SAD is reported. Probably of most concern are the numerous reports of sleep problems. These have prompted investigations of the underlying mechanisms and treatment interventions. A delay of the circadian system with “normal” working hours implies sleep is attempted at a suboptimal phase. Decrements in sleep efficiency, latency, duration, and quality are also seen in winter. Increasing the intensity of ambient light exposure throughout the day advanced circadian phase and was associated with benefits for sleep: blue-enriched light was slightly more effective than standard white light. Effects on performance remain to be fully investigated. At 75°S, base personnel adapt the circadian system to night work within a week, in contrast to temperate zones where complete adaptation rarely occurs. A similar situation occurs on high-latitude North Sea oil installations, especially when working 18:00–06:00 h. Lack of conflicting light exposure (and “social obligations”) is the probable explanation. Many have problems returning to day work, showing circadian desynchrony. Timed light treatment again has helped to restore normal phase/sleep in a small number of people. Postprandial response to meals is compromised during periods of desynchrony with evidence of insulin resistance and elevated triglycerides, risk factors for heart disease. Only small numbers of subjects have been studied intensively in polar regions; however, these observations suggest that suboptimal light conditions are deleterious to health. They apply equally to people living in temperate zones with insufficient light exposure.
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Saisie sur NuitFrance par : |
Rosor |
Saisie sur NuitFrance en : |
Octobre 2014 |
Identifiant NuitFrance : |
NF-BIBLI-87 |
Permalien de la fiche NuitFrance : |
http://www.nuitfrance.fr/?page=donneesdoc&partie=fiche-bibliographique&id_doc=87 |
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