Impact of long-term daylight deprivation on retinal light sensitivity, circadian rhythms and sleep during the Antarctic winter

Kawasaki, Aki; Wisniewski, Sophia; Healey, Beth; Pattyn, Nathalie; Kunz, Dieter; Basner, Mathias; Münch, Mirjam

doi:10.1038/s41598-018-33450-7

Cited by 40 publications

(33 citation statements)

References 38 publications

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“…The paper also concluded that hypoxia has a significant effect on sleep, likely due to periodic breathing. Kawasaki et al (2018) studied the effect of long-term daylight deprivation on retinal sensitivity, sleep and circadian rest-activity.…”

Section: Sleepmentioning

confidence: 99%

‘White Mars’ – nearly two decades of biomedical research at the Antarctic Concordia station

Ombergen

Rossiter

Ngo-Anh

2020

Experimental Physiology

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Extended stays in isolated, confined and extreme (ICE) environments like Antarctica are associated with a whole set of psychological and physiological challenges for the crew. As such, winter-over stays at Antarctica provide an important opportunity to acquire knowledge into the physiological and psychological changes that ICE environments inevitably bring. The European Space Agency (ESA) is particularly interested in conducting research in such an environment, as it is a unique opportunity to translate these results to space crews experiencing very similar issues. In the past two decades, the ESA has supported a total of 36 biomedical research projects at the Concordia station in collaboration with the French and Italian polar institutes. More specifically, studies in the areas of psychology, neuroscience, sleep physiology, cardiovascular physiology and immunology were performed. The outcomes of these studies are directly relevant for people working in ICE environments, but also help to better understand the biomedical challenges of those environments. Consequently, they can help to better prepare for human space exploration and to identify countermeasures to minimize the adverse effects of space environments on astronaut health. The aim of this review is to provide an overview of the biomedical studies that have taken place in the past two decades at the Antarctic Concordia station and to summarize the results and their implication for human spaceflight.

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Section: Sleepmentioning

confidence: 99%

‘White Mars’ – nearly two decades of biomedical research at the Antarctic Concordia station

Ombergen

Rossiter

Ngo-Anh

2020

Experimental Physiology

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“…Delay in sleep timing, and an increase in sleep fragmentation, were also found in winter by Francis et al (2008). Winter delay for bed-, wake-, sleep start-, and sleep end-time were also observed by Kawasaki et al (2018). In their study, two Antarctic stations, Halley and Concordia, were investigated, aiming at highlighting possible differences between the two altitudes.…”

Section: Polar Environmentsmentioning

confidence: 99%

Sleep in Isolated, Confined, and Extreme (ICE): A Review on the Different Factors Affecting Human Sleep in ICE

2020

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The recently renewed focus on the human exploration of outer space has boosted the interest toward a variety of questions regarding health of astronauts and cosmonauts. Among the others, sleep has traditionally been considered a central issue. To extend the research chances, human sleep alterations have been investigated in several analog environments, called ICEs (Isolated, Confined, and Extreme). ICEs share different features with the spaceflight itself and have been implemented in natural facilities and artificial simulations. The current paper presents a systematic review of research findings on sleep disturbances in ICEs. We looked for evidence from studies run in polar settings (mostly Antarctica) during space missions, Head-Down Bed-Rest protocols, simulations, and in a few ICE-resembling settings such as caves and submarines. Even though research has shown that sleep can be widely affected in ICEs, mostly evidencing general and non-specific changes in REM and SWS sleep, results show a very blurred picture, often with contradictory findings. The variable coexistence of the many factors characterizing the ICE environments (such as isolation and confinement, microgravity, circadian disentrainment, hypoxia, noise levels, and radiations) does not provide a clear indication of what role is played by each factor per se or in association one with each other in determining the pattern observed, and how. Most importantly, a number of methodological limitations contribute immensely to the unclear pattern of results reported in the literature. Among them, small sample sizes, small effect sizes, and large variability among experimental conditions, protocols, and measurements make it difficult to draw hints about whether sleep alterations in ICEs do exist due to the specific environmental characteristics, and which of them plays a major role. More systematic and cross-settings research is needed to address the mechanisms underlying the sleep alterations in ICE environments and possibly develop appropriate countermeasures to be used during long-term space missions.

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“…The daylight-like lighting is also beneficial to visual comfort, alertness, mood, and sleep quality [17], [22], [23]. Many researchers pursued mimicking dynamic daylight by the novel lighting of LEDs and OLEDs [6]- [12], [15], [17]- [19], [24]- [26]. However, a dynamic and full visible spectrum of daylight is hardly obtained by mixing monochromatic and/or phosphor-coated LEDs because of the width, the shape of the LED spectra, the green gap and the computation capability [6], [12], [17], [27].…”

Section: Introductionmentioning

confidence: 99%

Tunable LED Lighting With Five Channels of RGCWW for High Circadian and Visual Performances

et al. 2019

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In this study, red, green, cyan, warm white and cool white (RGCWW) LEDs are individually controlled to simulate dynamic daylight. The spectral power distributions (SPDs) are measured for both the daylight and the mixed white light. The correlated color temperature (CCT), circadian action factor (CAF) curves in the daytime of the mixed white LED almost overlap to those of daylight with a small error of about 1%. The CIE chromaticity coordinates of the mixed white light are distributed along the Planckian locus with a little deviation below 0.003. Also, its color rendering index (CRI) is above 90. The RGCWW five-chip LEDs of high circadian and visual performances will benefit to synchronize circadian rhythm in closed environment during long time without daylight, combined with better mood and alertness. The simulation errors and development trend of the mixed lighting are discussed.

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Impact of long-term daylight deprivation on retinal light sensitivity, circadian rhythms and sleep during the Antarctic winter

Cited by 40 publications

References 38 publications

‘White Mars’ – nearly two decades of biomedical research at the Antarctic Concordia station

‘White Mars’ – nearly two decades of biomedical research at the Antarctic Concordia station

Sleep in Isolated, Confined, and Extreme (ICE): A Review on the Different Factors Affecting Human Sleep in ICE

Tunable LED Lighting With Five Channels of RGCWW for High Circadian and Visual Performances

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