The Influence of Light, Exercise, and Behavior upon Circadian Rhythms

Mircsof, Dennis; Brown, Steven A.

doi:10.1016/b978-0-12-378610-4.00095-4

Cited by 1 publication

(2 citation statements)

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“…Erriksson et al, 1981;Tokura and Aschoff, 1983;Hastings et al, 1998;Pohl, 1998;Mistlberger and Skene, 2004;van Oort et al, 2007;Mircsof and Brown, 2013;El Allali et al, 2013;LeGates et al, 2014). The presence of several secondary zeitgebers (such as ambient temperature, patterns of eating and drinking, social influences and physical activity) that allow the entrainment of circadian rhythms in the absence of light is also well accepted (e.g.…”

Section: Temperature As a Dominant Modifier Of Activity Rhythms In Thmentioning

confidence: 99%

“…Daan and Aschoff, 1975;LeGates et al, 2014), but several secondary zeitgebers or modifiers of light entrained patterns (such as temperature, patterns of eating and drinking, social influences and physical activity) allow the entrainment of circadian rhythms in the absence of, or in concert with, the primary light zeitgeber (e.g. Erriksson et al, 1981;Tokura and Aschoff, 1983;Hastings et al, 1998;Pohl, 1998;Mistlberger and Skene, 2004;van Oort et al, 2007;Mircsof and Brown, 2013;El Allali et al, 2013). Intricately linked with the circadian entrained daily activity pattern is the timing of sleep, as sleep mostly occurs in the daily phase of general and prolonged inactivity (Monk, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Arabian Oryx (Oryx leucoryx) Respond to Increased Ambient Temperatures with a Seasonal Shift in the Timing of Their Daily Inactivity Patterns

et al. 2016

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The Arabian oryx inhabits an environment where summer ambient temperatures can exceed 40°C for extended periods of time. While the oryx employs a suite of adaptations that aid survival, the effects of this extreme environment on inactivity/sleep, where ambient temperatures often exceed mammalian thermoneutral zones, are unknown.To determine how the oryx manages inactivity/sleep seasonally we used fine and coarsegrain actigraphy, in 16 animals, to reveal when the animals were inactive/sleeping in relation to variations in ambient temperatures and light levels. We demonstrate that during the cooler winter months the oryx is inactive/sleeping during the cooler parts of day (pre-dawn hours), showing a diurnal activity pattern. In contrast, in the summer months, the oryx displayed a crepuscular activity pattern, with the major inactivity/sleep bouts occurring equally during both the coolest part of the night (pre-dawn hours) and the hottest part of the day (afternoon hours). Interestingly, the daily rhythm of the timing of changes in core body temperature did not vary seasonally, although the amplitude did change. The transition from winter diurnal activity to summer crepuscular activity occurred in May, while the reverse occurred in September. By having half of the major summer sleep bouts during the hottest part of the day, the oryx may take advantage of the thermoregulatory physiology of sleep to mitigate increases in body temperature. The seasonal summer desynchronization of circadian entrained daily rhythms (core body temperature and daily activity patterns) is suggestive of temperature acting to mask, or modify, output pathways from the suprachiasmatic nucleus.

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