Effect of morning bright light on body temperature, plasma cortisol and wrist motility measured during 24 hour of constant conditions

Foret, Jean; Aguirre, Alberto de Barros; Touitou, Yvan; Clodoré, M.; Benoît, O

doi:10.1016/0304-3940(93)90696-i

Cited by 16 publications

(9 citation statements)

References 15 publications

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“…Timed exposure to bright light and darkness can rapidly phase shift the timing of rhythms controlled by the human circadian pacemaker (Czeisler et al, 1986(Czeisler et al, , 1989(Czeisler et al, , 1990Dijk et al, 1987Dijk et al, , 1989Broadway et al, 1987;Lewy et al, 1987;Honma and Honma, 1988;Shanahan and Czeisler, 1991;Minors et al, 1991;Van Cauter et al, 1993Foret et al, 1993b;Allan and Czeisler, 1994;Boivin et al, 1994;Jewett et al, 1994;Shanahan et al, 1997). However, estimation of those light-induced phase shifts has been largely based on phase assessments performed under controlled conditions before and after but not during the phase-resetting stimulus (Hansen et al, 1987;Broadway et al, 1987;Dijk et al, 1989;Rosenthal et al, 1990;Shanahan and Czeisler, 1991;Buresová et al, 1991;Campbell et al, 1993a;Foret et al, 1993a;Lemmer et al, 1994;Deacon and Arendt, 1994;Boivin and Czeisler, 1998;Zeitzer et al, 1997). Few studies have reported melatonin data collected throughout the entire resetting trial (Lynch et al, 1978;Bureošvá et al, 1991;Whitson et al, 1995;Laakso et al, 1993;Van Cauter et al, 1994); none of the three-cycle resetting trials have described data observed throughout the circadian resetting process due to masking effects that complicate the identification of the endogenous circadian components of various rhythms.…”

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confidence: 96%

Melatonin Rhythm Observed throughout a Three-Cycle Bright-Light Stimulus Designed to Reset the Human Circadian Pacemaker

et al. 1999

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Exposure to light and darkness can rapidly induce phase shifts of the human circadian pacemaker. A type 0 phase response curve (PRC) to light that has been reported for humans was based on circadian phase data collected from constant routines performed before and after a three-cycle light stimulus, but resetting data observed throughout the entire resetting protocol have not been previously reported. Pineal melatonin secretion is governed by the hypothalamic circadian pacemaker via a well-defined neural pathway and is reportedly less subject to the masking effects of sleep and activity than body temperature. The authors reasoned that observation of the melatonin rhythm throughout the three-cycle light resetting trials could provide daily phase-resetting information, allowing a dynamic view of the resetting response of the circadian pacemaker to light. Subjects (n = 12) living in otherwise dim light (~10-15 lux) were exposed to a noncritical stimulus of three cycles of bright light (~9500 lux for 5 h per day) timed to phase advance or phase delay the human circadian pacemaker; control subjects (n = 11) were scheduled to the same protocols but exposed to three 5-h darkness cycles instead of light. Subjects underwent initial and final constant routine phase assessments; hourly melatonin samples and body temperature data were collected throughout the protocol. Average daily phase shifts of 1 to 3 h were observed in 11 of 12 subjects receiving the bright light, supporting predictions obtained using Kronauer’s phase-amplitude model of the resetting response of the human circadian pacemaker. The melatonin rhythm in the 12th subject progressively attenuated in amplitude throughout the resetting trial, becoming undetectable for > 32 hours preceding an abrupt reappearance of the rhythm at a shifted phase with a recovered amplitude. The data from control subjects who remained in dim lighting and darkness delayed on average – 0.2 h per day, consistent with the daily delay expected due to the longer than 24-h intrinsic period of the human circadian pacemaker. Both temperature and melatonin rhythms shifted by equivalent amounts in both bright light-treated and control subjects (R = 0.968; p < 0.0001; n = 23). Observation of the melatonin rhythm throughout a three-cycle resetting trial has provided a dynamic view of the daily phase-resetting response of the human circadian pacemaker. Taken together with the observation of strong type 0 resetting in humans in response to the same three-cycle stimulus applied at a critical phase, these data confirm the importance of considering both phase and amplitude when describing the resetting of the human circadian pacemaker by light.

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confidence: 96%

Melatonin Rhythm Observed throughout a Three-Cycle Bright-Light Stimulus Designed to Reset the Human Circadian Pacemaker

et al. 1999

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“…CBT has a circadian oscillation; i.e., it drops at the onset of sleep (18,19), continues to decrease during sleep (20) and gradually rises as a person wakes (21). We investigated the effects of glycine on CBT in rats (22).…”

Section: The Pharmacological Effects Of Glycine On Sleep In Ratsmentioning

confidence: 99%

New Therapeutic Strategy for Amino Acid Medicine: Glycine Improves the Quality of Sleep

Bannai

Kawai

2012

J Pharmacol Sci

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Abstract. Glycine is a non-essential amino acid that has indispensable roles in both excitatory and inhibitory neurotransmission via N-methyl-D-aspartate type glutamate receptors and glycine receptors, respectively. We recently reported that glycine ingestion before bedtime significantly ameliorated subjective sleep quality in individuals with insomniac tendencies. Oral administration of glycine to rats was found to induce a significant increase in the plasma and cerebrospinal fluid glycine concentrations and a significant decrease in the core body temperature associated with an increase in cutaneous blood flow. The decline in the core body temperature might be a mechanism underlying glycine's effect on sleep, as the onset of sleep is known to involve a decrease in the core body temperature. Moreover, a low core body temperature is maintained during sleep in humans. Pharmacological studies investigating the mechanisms of glycine on sleep were also performed. In this review, we will describe both our recent findings regarding how and where orally administered glycine acts and findings from our rat study and human trials.

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“…This may be enough to evaluate the effect of lighting on the CIZ, as the effect of morning bright light on core temperature was demonstrated when subjects were exposed to bright light for 2 hours (e.g., Foret et al, 1993;Takasu et al, 2006). Intensity of lighting was set at 500 and 1,000 lx in the present study, substantially lower than 2,000 lx to 5,000 lx set at by Foret et al (1993). However, Jin et al (2007) demonstrated the effect of lighting on EEG when their subjects were exposed to 200 lx and 1,500 lx for 20 min on each trial.…”

Section: Effect Of Light Conditions On the Cizmentioning

confidence: 99%

“…These findings imply that the circadian rhythm may be more complex than just a shift in the central reference temperature, and nonthermal factors such as light exposure may play an important role in body temperature regulation in humans. In the studies of circadian rhythm of core temperature, exposure to bright light is known to trigger an increase in core temperature in the morning (e.g., Foret et al, 1993;Takasu et al, 2006). This suggests an effect of lighting on body temperature regulation in humans.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Season and Light Intensity on the Core Interthreshold Zone

Kakitsuba

Mekjavic

Katsuura

2011

J Physiol Anthropol

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The hypothesis tested in the present study is a seasonal difference in the core interthreshold zone (CIZ), as we suggested in an earlier study that individual awareness of heat may change the CIZ due to thermoregulatory behavior. A series of human experiments were carried out in a climatic chamber in January and August of 2009 and January of 2010. The air temperature in the chamber was controlled at 20-24°C. Subjects wore a water-perfused suit that was perfused with 25°C water at a rate of 600 cc/min. They exercised on an ergometer at 50% of their maximum work rate for 10-15 min until their sweating rate increased and then remained seated without exercise until oxygen uptake increased. Subjects' rectal temperature and skin temperatures at four sites were monitored by thermistors. The sweating rate was measured at the forehead with a sweat rate monitor (SKD 4000, Skinos Co.). Oxygen uptake was monitored with a gas analyzer (Respiromonitor RM-300i, Minato Med. Science Co.). In the 2009 winter experiment, 5 male subjects were exposed to lighting of 36 cd/m 2 /1,050 lx, and in the 2009 summer and 2010 winter experiments, 10 male subjects were exposed to lighting of 18 cd/m2/510 lx. The results showed that the CIZ of 0.69Ϯ0. 29°C (nϭ22, data from 2005-2007 experiments) at 36 cd/m 2 and that of 0.37Ϯ0.17°C (nϭ10) at 18 cd/m 2 in summer were greater than the CIZ of 0.37Ϯ0.13°C (nϭ5) at 36 cd/m 2 and that of 0.18Ϯ0.17°C (nϭ10) at 18 cd/m 2 in winter, and thus demonstrated a seasonal difference in the CIZ as well as an effect of lighting conditions on the CIZ.

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Effect of morning bright light on body temperature, plasma cortisol and wrist motility measured during 24 hour of constant conditions

Cited by 16 publications

References 15 publications

Melatonin Rhythm Observed throughout a Three-Cycle Bright-Light Stimulus Designed to Reset the Human Circadian Pacemaker

Melatonin Rhythm Observed throughout a Three-Cycle Bright-Light Stimulus Designed to Reset the Human Circadian Pacemaker

New Therapeutic Strategy for Amino Acid Medicine: Glycine Improves the Quality of Sleep

The Effect of Season and Light Intensity on the Core Interthreshold Zone

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