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Bright Light as Chronobiological Countermeasure for Shiftwork in Space

Samel, A. und Gander, P. (1) (1995) Bright Light as Chronobiological Countermeasure for Shiftwork in Space. 11th IAA Man in Space Symposium, Toulouse Labege, Frankreich, 27.-31.03.95.

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Kurzfassung

Work-rest schedules during long duration space missions involve se- veral factors which could disrupt sleep and circadian temporal organisation: (1) displacement of sleep due to two-shift operations; (2) planned or unplanned schedule changes due to operational require-ments; (3) social and light zeitgebers different from those on earth; (4) changes in the gravitational exposure. Timed bright light treat-ment has the potential to accelerating adaptation to schedule chan- ges. Four male subjects were exposed to two sessions of 11 d of simu-lated microgravity (6 head down tilt bedrest) with 6-h extensions of the wake period on 2 days (12-h phase delay). In a blind crossover design, subjects were exposed to bright light (> 3500 lux) for 5 h on each of the 2 shift days and the following day, at times either ex- pected to accelerate the adjustment to the phase delay (experimental condition) or to have no phase shifting effect (control condition). Sleep was recorded polygraphically, the circadian system was monito- by recordings of heart rate and body temperatur, and by collection of urine (electrolyte and hormone excretion). Only the rhythms of 6-hy-droxymelatoninsulphate and potassium excretions showed significantly enhanced adjustment under the experimental condition. Different rhythms adapted to the 12-h delay at different rates, comparable to those observed after time zone shifts. Sleep was shorter in simulated weightlessness than in normal ambulatory age-matched subjects, con- sistent with the shorter sleep durations characteristic of space flight. These results confirm the disruptive effects of wake-rest schedule shifts on sleep and circadian rhythms. Contrary to our ini- tial hypothesis, 5-h exposure to bright light finishing at the time of the circadian temperature minimum were not more effective at acce-lerating adjustment to a 12-h schedule delay than exposures coinci- ding with the temperature maximum. We conclude that, while bright light may accelerate adjustment to work-rest schedule delays, any.

elib-URL des Eintrags:https://elib.dlr.de/27235/
Dokumentart:Konferenzbeitrag (Vortrag)
Zusätzliche Informationen: LIDO-Berichtsjahr=1995,
Titel:Bright Light as Chronobiological Countermeasure for Shiftwork in Space
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Samel, A.NICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Gander, P. (1)NICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:1995
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Space Flight, Astronauts, Shiftwork, Circadian Rhythms, Sleep, Performance, Countermeasures, Bright Light, Temperature, Hormones, Electrolytes, EEG, ECG, EOG, EMG, Delay Shift
Veranstaltungstitel:11th IAA Man in Space Symposium, Toulouse Labege, Frankreich, 27.-31.03.95
HGF - Forschungsbereich:NICHT SPEZIFIZIERT
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:NICHT SPEZIFIZIERT
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Luft- und Raumfahrtmedizin
Hinterlegt von: DLR-Beauftragter, elib
Hinterlegt am:02 Apr 2006
Letzte Änderung:27 Apr 2009 06:32

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