Results 271 to 280 of about 136,810 (312)
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The Journal of Clinical Endocrinology & Metabolism, 1976
The circadian rhythm of plasma renin activity during continuous recumbency was determined fifty-one times in thirty subjects who either slept at night or remained awake for 24 h. Both groups had maximum values between 2400 and 0800 h, despite absence of the expected early morning fall in blood pressure, pulse, and glomerular filtration rate in the ...
R S, Modlinger +3 more
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The circadian rhythm of plasma renin activity during continuous recumbency was determined fifty-one times in thirty subjects who either slept at night or remained awake for 24 h. Both groups had maximum values between 2400 and 0800 h, despite absence of the expected early morning fall in blood pressure, pulse, and glomerular filtration rate in the ...
R S, Modlinger +3 more
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The American Journal of Medicine, 1988
All forms of life, from the simplest cells to the most complex organisms, show periodicity in some of their biologic activities and functions. The most common of these rhythmic events are those that we refer to as "circadian" (circa, around; dias, day).
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All forms of life, from the simplest cells to the most complex organisms, show periodicity in some of their biologic activities and functions. The most common of these rhythmic events are those that we refer to as "circadian" (circa, around; dias, day).
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Circadian rhythms in the fetus
Molecular and Cellular Endocrinology, 2012Throughout gestation, the close relationship between mothers and their progeny ensures adequate development and a successful transition to postnatal life. By living inside the maternal compartment, the fetus is inevitably exposed to rhythms of the maternal internal milieu such as temperature; rhythms originated by maternal food intake and maternal ...
Serón Ferré, María +9 more
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Seminars in Neurology, 2004
Circadian rhythm sleep disorders occur when individuals attempt to sleep at the wrong circadian time. The misalignment between the internal circadian timing system and the external environment is typically due to either an alteration in the functioning of the circadian timing system (e.g., delayed or advanced sleep phase disorder) or to changes in the ...
Kathryn J, Reid, Phyllis C, Zee
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Circadian rhythm sleep disorders occur when individuals attempt to sleep at the wrong circadian time. The misalignment between the internal circadian timing system and the external environment is typically due to either an alteration in the functioning of the circadian timing system (e.g., delayed or advanced sleep phase disorder) or to changes in the ...
Kathryn J, Reid, Phyllis C, Zee
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IFAC Proceedings Volumes, 2009
Abstract The HomeCare is a special monitoring system of the basic life functions. It has been primarily designed to take care for elderly people. But many of the designed devices could be used in the other branches of biotelemetry. Our HomeCare system is designed with respect to user comfort and it uses as cheap technical solutions as possible.
Martin Cerný 0002, Marek Penhaker
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Abstract The HomeCare is a special monitoring system of the basic life functions. It has been primarily designed to take care for elderly people. But many of the designed devices could be used in the other branches of biotelemetry. Our HomeCare system is designed with respect to user comfort and it uses as cheap technical solutions as possible.
Martin Cerný 0002, Marek Penhaker
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The Lancet Neurology, 2018
Advances in diagnostic technology, including chronic intracranial EEG recordings, have confirmed the clinical observation of different temporal patterns of epileptic activity and seizure occurrence over a 24-h period. The rhythmic patterns in epileptic activity and seizure occurrence are probably related to vigilance states and circadian variation in ...
Khan S. +6 more
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Advances in diagnostic technology, including chronic intracranial EEG recordings, have confirmed the clinical observation of different temporal patterns of epileptic activity and seizure occurrence over a 24-h period. The rhythmic patterns in epileptic activity and seizure occurrence are probably related to vigilance states and circadian variation in ...
Khan S. +6 more
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Circadian Rhythms and Arthritis
Rheumatic Disease Clinics of North America, 2005The clinical symptoms of rheumatoid arthritis (RA) show a circadian variation; joint stiffness and pain are more prominent in the early morning. An altered functioning of the hypothalamic-pituitary-adrenal axis (cortisol) and of the pineal gland (melatonin) seems to be important factors in the perpetuation and clinical circadian symptoms of RA ...
Maurizio, Cutolo, Alfonse T, Masi
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Identification of circadian rhythm
2016 24th Mediterranean Conference on Control and Automation (MED), 2016We present an identification algorithm for determining the variables characterizing a circadian rhythm. This method is based on a recursive least square algorithm combined with an appropriate observer. It has the advantage of determining all the parameters of a time-varying circadian rhythm without requiring the knowledge of the period.
Pigeon, Eric +7 more
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Experimental Gerontology, 1991
The human biological clock or "circadian system" serves the function of preparing the body and mind for restful sleep at some times of day and active wakefulness at others. The observed circadian rhythms result from three interacting processes: endogenous rhythm generation mechanisms, entrainment mechanisms to keep these rhythms "on track," and ...
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The human biological clock or "circadian system" serves the function of preparing the body and mind for restful sleep at some times of day and active wakefulness at others. The observed circadian rhythms result from three interacting processes: endogenous rhythm generation mechanisms, entrainment mechanisms to keep these rhythms "on track," and ...
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Melatonin and Circadian Rhythms
Current Topics in Medicinal Chemistry, 2002Melatonin synthesis and secretion by the pineal gland is under the control of the suprachiasmatic nucleus and consequently has a profound circadian rhythm. In this review we discuss some of the issues surrounding the measurement of melatonin rhythmicity in biological fluids and the factors that influence melatonin circadian rhythmicity, including light
Kennaway, D., Wright, H.
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