Tag: "circadian" at medical news

UCSF study offers insight into human circadian rhythms

...anisms of the body's internal biological clock, or circadian rhythms -- a waxing and waning of genetic, biochem...this possibility, as well. "Evidence suggests that circadian rhythms may have a fundamental role in numerous behaviors," says Ying-hui Fu, PhD, associate profess...

Physicists find patterns within seemingly random events of physiological systems

...nvestigate the role the body's internal clock, the circadian pacemaker, might have on heart performance either ...beat dynamics from participants show a significant circadian rhythm, including a notable response at the circadian phase corresponding to 10 a.m., the time of da...

Pitt research shows NASA sleep-wake scheduling guide may need to be changed

...ms with a period of about 24 hours referred to as circadian rhythms. In orbit, the sunrise-sunset cycle lasts ... body temperature the best standard for assessing circadian rhythms. At the same time they recorded their sleep to assess its duration and quality. The experime...

Insomnia poorly understood by medical profession

...primary psychiatric disorders, medical conditions, circadian disorders, or specific physiological sleep disorders--eg, sleep apnoea and periodic limb movement disorder--are essential steps in management of insomnia. The authors discuss how drug treatments are common, despite little empirical research among...

Molecular clock genes influence metabolism of sugar and dietary fats

... The investigators demonstrate a role for the circadian clock proteins, Bmal1 and Clock, in regulating the day-to-day levels of glucose in the blood. Suppressing the action of these molecules eliminates the diurnal variation in glucose and triglyceride levels. In addition, they found that a mutated Clock ...

Lung function regulated by circadian rhythms

... (ACCP), lung function was found to have a natural circadian rhythm, where it is at its peak during the late af...techniques or biofeedback may modify lung function circadian rhythms, helping to manage a person's low and high lung function throughout the day, added Dr. Medar...

Increase in childhood leukaemia may be part due to increased light at night

...atural hours of darkness. LAN disrupts our natural circadian rhythm, suppressing the normal nocturnal productio...loring the mechanisms by which light regulates the circadian system. He explains "Embedded within the genes of us, and almost all life on earth, are the instruct...

Small, frequent doses of caffeine best strategy for staying awake

...ed by two opposing but interacting processes. The circadian system promotes sleep rhythmically--an internal cl...ded day was also designed to disrupt the subjects' circadian system while maximizing the effects of the homeostatic push for sleep. Following a randomized, doubl...

Three Harvard Medical School endowed chairs named simultaneously in sleep medicine

...port will greatly accelerate advances in sleep and circadian rhythm research. At a time when nearly 40 million ...ses on understanding the neurobiology of the human circadian pacemaker and applying that knowledge to clinical medicine and occupational health. The neurobiology...

New study: Small, frequent doses of caffeine best strategy for staying awake

...ned by two opposing but interacting processes. The circadian system promotes sleep rhythmically-an internal clo...ded day was also designed to disrupt the subjects' circadian system while maximizing the effects of the homeostatic push for sleep. Following a randomized, doubl...

Patients with multiple sclerosis and fatigue may have abnormal sleep cycles

...t, Burlington, and colleagues investigated whether circadian rhythm abnormalities or sleep disturbances exist in patients with MS and if they correlate with fatigue and daytime sleepiness. Circadian rhythms are the cycles of sleep and wakefulness, controlled by part of the brain. The researchers studied 15 p...

Sleep problems in early childhood may predict substance use during adolescence

...te that there is a pathophysiology of the sleep or circadian systems? Importantly, will treatment of the sleep problem reduce the risks?" ...

Link between sleep, cancer progression explored by Stanford researcher

.... This makes the sleep/wake cycle, also called the circadian rhythm, a good candidate for linking a person's so.... Spiegel suggested two possible ways in which the circadian rhythm may influence cancer progression. The first involves a hormone called melatonin, which the br...

Eye disease may cause sleep disorders

...e directly with the areas of the brain involved in circadian rhythms, the visually impaired subjects were divid...Vision helps entrain the neuroendocrine control of circadian rhythms, and even poor vision is much better than no vision at all." Dr. Sadun's discussion of the s...

Optic nerve disease may cause sleep disorders

...aturally occurring hormone that helps regulate the circadian clock. Its release is related to the eye's light meter function. But even before he learns whether it's possible to help these patients to synchronize their internal clocks to the outside world, Van Gelder believes it is important for health profess...

Patients recovering from depression with talk therapy show a 'distinct' pattern of brain changes

...ttom) regions which drive more basic emotional and circadian behaviors resulting in eventual upstream changes in depressive thinking. In this current study in Archives, 14 clinically-depressed adult patients underwent a full course of CBT. They each received 15 to 20 individualized outpatient sessions. None we...

New study details effects of exercise on sleep quality in postmenopausal women

...ersus evening exercise may differentially modulate circadian rhythms that affect sleep quality. More research is needed to confirm this theory. While the study reports that increased physical fitness is a strong indicator of improved sleep quality in postmenopausal women, who are at higher risk for lower slee...

Stanford research builds link between sleep, cancer progression

.... This makes the sleep/wake cycle, also called the circadian rhythm, a good candidate for linking a person's so.... Spiegel suggested two possible ways in which the circadian rhythm may influence cancer progression. The first involves a hormone called melatonin, which the br...

St. Jude Medical announces publication of results of its ADOPT-A trial

...patient's intrinsic rate to allow for activity and circadian variation," said Michael J. Coyle, President of St. Jude Medical's Cardiac Rhythm Management business. "The AF Suppression(tm) feature has been available to our physician customers, who report that it's effective, well tolerated and easy to use. We...

Northwestern on trail of gene mutations that trigger sex reversal

...oseph S. Takahashi, who cloned the first mammalian circadian gene, Clock. Takahashi, who directs the center, is professor of neurobiology and physiology and of neurology....

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