Body temperature and the return of slow wave activity in extended sleep

Christ, G.; Koninck, Joseph De; Hébert, Marc; Carrier, Julie; Lamarche, Carole H.; Dufour, Sophie

doi:10.1016/0013-4694(95)00215-4

Cited by 13 publications

(5 citation statements)

References 13 publications

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“…Alternatively, the sleep–wake cycle during the day and night is regulated by the circadian clock, independent of prior sleep or wake time [ 81 ]. Whereas it has long been thought that the afternoon sleepiness is under the homeostatic sleep control, several studies challenged this notion and suggested that the afternoon sleep propensity may instead reflect an endogenous 12-hour cycle of slow wave sleep (which is also referred to as nonrapid eye movement sleep or in more colloquial terms “deep sleep”), independent of duration of prior wakefulness [ 61 , 69 , 74 ]. Although it has been convincingly demonstrated that slow wave sleep can be strongly induced by local increased levels of adenosine in the basal forebrain through its adenosine A1 receptor and repressed by its antagonist caffeine [ 82 , 85 ], the mechanism of how the concentration of adenosine is regulated in the brain remains elusive.…”

Section: The Prevalence Of Mammalian 12-hour Rhythmsmentioning

confidence: 99%

Unveiling “Musica Universalis” of the Cell: A Brief History of Biological 12-Hour Rhythms

Zhu

Dacso

O’Malley

2018

Journal of the Endocrine Society

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Abstract“Musica universalis” is an ancient philosophical concept claiming the movements of celestial bodies follow mathematical equations and resonate to produce an inaudible harmony of music, and the harmonious sounds that humans make were an approximation of this larger harmony of the universe. Besides music, electromagnetic waves such as light and electric signals also are presented as harmonic resonances. Despite the seemingly universal theme of harmonic resonance in various disciplines, it was not until recently that the same harmonic resonance was discovered also to exist in biological systems. Contrary to traditional belief that a biological system is either at stead-state or cycles with a single frequency, it is now appreciated that most biological systems have no homeostatic “set point,” but rather oscillate as composite rhythms consisting of superimposed oscillations. These oscillations often cycle at different harmonics of the circadian rhythm, and among these, the ~12-hour oscillation is most prevalent. In this review, we focus on these 12-hour oscillations, with special attention to their evolutionary origin, regulation, and functions in mammals, as well as their relationship to the circadian rhythm. We further discuss the potential roles of the 12-hour clock in regulating hepatic steatosis, aging, and the possibility of 12-hour clock–based chronotherapy. Finally, we posit that biological rhythms are also musica universalis: whereas the circadian rhythm is synchronized to the 24-hour light/dark cycle coinciding with the Earth’s rotation, the mammalian 12-hour clock may have evolved from the circatidal clock, which is entrained by the 12-hour tidal cues orchestrated by the moon.

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Section: The Prevalence Of Mammalian 12-hour Rhythmsmentioning

confidence: 99%

Unveiling “Musica Universalis” of the Cell: A Brief History of Biological 12-Hour Rhythms

Zhu

Dacso

O’Malley

2018

Journal of the Endocrine Society

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“…During waking this ultradian rhythm is manifested by an alternation between fantasy and cognitive concentration which could influence measures of peak performance in learning and memory tasks (Broughton, 1975; Stampi, 1992). A second 12 hour ultradian rhythm appears to be associated with the pressure for napping at midday (13 to 15 hr), thus reinforcing the wisdom of this practice in many societies (Broughton, 1975; Gagnon and De Koninck, 1984; Christ et al, 1996). Recent research suggests that mid-afternoon naps have both physiological and psychological benefits (Dinges and Broughton, 1989).…”

Section: Sleep: An Active Statementioning

confidence: 86%

“…4. A second 12 hour ultradian rhythm appears to be associated with the pressure for napping at midday (13 to 15 hr), thus reinforcing the wisdom of this practice in many societies (Broughton, 1975;Gagnon and De Koninck, 1984;Christ et al, 1996). Recent research suggests that mid-afternoon naps have both physiological and psychological benefits (Dinges and Broughton, 1989).…”

Section: Optimalmentioning

confidence: 96%

Sleep, the common denominator for psychological adaptation.

Koninck¹

1997

Canadian Psychology / Psychologie canadienne

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Research over the last three decades has increasingly demonstrated that sleep and its various components have a direct impact on many psychological functions such as vigilance, learning, memory, mood and psychological adaptation in general. More recently, the discovery of closer links of circadian rhythms with sleep quality has lead to the development of better intervention methods for adaptation to shift work, circadian phase disruptions and mood disorders (depressions). We present an overview of some of those findings pointing out the contributions of Canadian psychology laboratories. We conclude that more attention should be given to sleep and biological rhythms in research and training in both experimental and applied psychology, as well as in professional practice.

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“…A 12-h (circasemidian) component characterizes the ER- and mitochondria-associated “unfolded protein response (UPR) cycle” 88 – 93 . Several potential roles of the circasemidian clock in coordinating human health have been proposed, such as maintaining metabolic homeostasis 87 , coordinating sleep quality of slow wave sleep 94 , 95 , and mediating aging, especially in the prevention of aging-related metabolic decline 87 , 88 , 96 , 97 .…”

Section: Discussionmentioning

confidence: 99%

Methods for assessing change in brain plasticity at night and psychological resilience during daytime between repeated long-duration space missions

Otsuka

Cornélissen

Kubo

et al. 2023

Sci Rep

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This study was designed to examine the feasibility of analyzing heart rate variability (HRV) data from repeat-flier astronauts at matching days on two separate missions to assess any effect of repeated missions on brain plasticity and psychological resilience, as conjectured by Demertzi. As an example, on the second mission of a healthy astronaut studied about 20 days after launch, sleep duration lengthened, sleep quality improved, and spectral power (ms2) co-varying with activity of the salience network (SN) increased at night. HF-component (0.15–0.50 Hz) increased by 61.55%, and HF-band (0.30–0.40 Hz) by 92.60%. Spectral power of HRV indices during daytime, which correlate negatively with psychological resilience, decreased, HF-component by 22.18% and HF-band by 37.26%. LF-component and LF-band, reflecting activity of the default mode network, did not change significantly. During the second mission, 24-h acrophases of HRV endpoints did not change but the 12-h acrophase of TF-HRV did (P < 0.0001), perhaps consolidating the circadian system to help adapt to space by taking advantage of brain plasticity at night and psychological resilience during daytime. While this N-of-1 study prevents drawing definitive conclusions, the methodology used herein to monitor markers of brain plasticity could pave the way for further studies that could add to the present results.

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Body temperature and the return of slow wave activity in extended sleep

Cited by 13 publications

References 13 publications

Unveiling “Musica Universalis” of the Cell: A Brief History of Biological 12-Hour Rhythms

Unveiling “Musica Universalis” of the Cell: A Brief History of Biological 12-Hour Rhythms

Sleep, the common denominator for psychological adaptation.

Methods for assessing change in brain plasticity at night and psychological resilience during daytime between repeated long-duration space missions

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