How to use circadian in a sentence

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Sentence Examples It acts as the body's principal circadian pacemaker, regulating and entraining daily rhythms of physiology and behavior. Glucocorticoid secretion occurs in a circadian pattern and in response to stress. Nonetheless, the circadian clock of plants is currently being dissected and this evidence may be helpful for hypothesis formation. Does the positive feedback influence the robustness of the circadian oscillator? Still slower ultradian rhythms, with a period of 2 h, and circadian rhythms have also been observed. To those working on the night shift, this cold feeling should be considered a warning sign of extreme circadian disruption. A feature shared by many clock gene transcripts is that their abundance is subject to circadian and diurnal oscillation. In continuous light, circadian growth rhythms were detectable for up to 2 weeks. In human adults, many biological functions display a physiological circadian rhythm that oscillates in synchronism with the sleep-wake rhythm. All zeitgebers mirror the cycle length of the earth's rotation and they therefore shaped circadian systems as they evolved. The pineal gland hormone, melatonin, is one of the endproducts regulated by the circadian system. Jet lag happens when the body's circadian rhythms are disrupted by changes in light. While discussing the mechanisms underlying circadian rhythms, it would be well worth mentioning their genetic basis. Temperature is one of the main signals that keep the circadian clock in synchrony with the environment. The tonoplast of K. daigremontiana mesophyll cells exhibits circadian behaviour of malate retention under constant darkness. Furthermore, extraretinal photoreceptors appear to be involved in the photic entrainment of the circadian clock. As a consequence, most biological processes, from sleep-wake cycles in people to leaf movements in plants, follow a daily, circadian rhythm. Such internal clocks are known as circadian clocks, which are tuned to biological rhythms that recur on a daily basis. Indeed, most organisms have evolved specialized photoreceptors for circadian light perception. Otherwise known as our circadian rhythm, our 24-hour body clock resets itself at sunrise and sunset each day. Show More Sentences The circadian rhythm resides with an infradian rhythm of lunar 28-day cycles, seasonal cycles of cold and hot as well as shifting light and dark. Chapter 6 deals with circadian rhythm and chronotherapy of asthma medications. For this reason, the researchers decided to examine the output of the body's internal clock, called the circadian pacemaker. It has been postulated that normal development may include the establishment of a circadian rhythm in the secretion of arginine vasopressin, the antidiuretic hormone. Cryptochrome also controls circadian rhythms and the body clock, which regulates the sleep-wake cycle and also the immune system. In 1998 the journal Science published a report that indicated that light exposure to the back of the knee may reset the human circadian pacemaker. When we sleep during the day, we are literally out of synch with our circadian rhythms. Unlike our circadian rhythms, sleep is an ultradian rhythm, meaning shorter than a day in length. This is regulated by what we now call our internal biological clock i.e. the circadian rhythms. It binds to receptors in the brain's circadian clock and acts to entrain the clock to the day-night cycle. The dolphins made it to the beach and the capitulators made it into deep water with minimal disturbance to the circadian rhythms of the seafront dwellers. The key factors that influence fatigue include accumulated hours without sleep and changes in circadian rhythm. That is, the hands of the circadian clock are moved forward or backwards. Bright electric light can shift your circadian rhythms, as your body clock is called, according to a 2001 study published in the Journal of Investigative Medicine. Your circadian rhythm is regulated by a biological clock in your brain that usually makes you sleepy at night and ready to wake up in the morning. Like many other biological processes, the body's defences may follow their own circadian rhythms. Vanda Pharmaceuticals' drug mimics the effects of melatonin, a hormone that regulates our bodies' circadian rhythms. Such a transition would have required at least six days for full circadian adjustment to occur. In conclusion, the top-dress appears to have modified the central circadian rhythm and plasma insulin and blood urea nitrogen. However, the accident took place during a time of day when a person's circadian rhythm is known to be at a low point. Show More Sentences Fatigue can be the result of factors other than restricted sleep or circadian disruption. Sudden changes in temperature, circadian or annual, seriously affect its maturity. The output from this intrinsic clock then flows to complex circuits in other parts of the brain to regulate the various circadian cycles. The beauty of her work is that she is studying people in a well-controlled environment and always accounts for circadian rhythms. Among other factors, fatigue can result from prolonged wakefulness and can occur during low points in the natural circadian rhythm of alertness. Failure to synchronize your patterns of activity and stimulation with your body's natural circadian and ultradian rhythms puts a stress on the system. Two causes of fatigue are inadequate quantity or quality of sleep, and disruption of circadian rhythm. The rapidly changing length of day around the equinoxes might disturb the circadian and sleep-wake rhythms and change mood and activity in vulnerable individuals. Plants keep pace with daily environmental fluctuations through the endogenous timekeeping circadian clock mechanism. Thus the circadian rhythm acts against the night driver both while working and while trying to sleep. This appears to be due to a circadian rhythm that biologically predisposes humans to be more effective during the day. When a person's circadian rhythm is low, they are more susceptible to performance-related errors. During their first few days, newborns sleep for very short periods of 3-4 hours on average, without any circadian rhythm. It is therefore likely that the pilot was exposed to an increased risk of fatigue due to circadian rhythm disruptions. The expression of CO is under the control of a circadian clock. Terry learned to eat in tune with his natural circadian rhythms. Arabidopsis has open rosette leaves during the day and directs its leaves upward at night and this leaf movement is controlled by the circadian clock. Lighting signals your body's circadian rhythm and can have a strong effect on your mood. Research has determined that disruptions in circadian rhythms affect performance and cognitive functioning. He will examine mice that lack circadian clock function in selected tissues or organs for deficits in physiology and behavior. Show More Sentences Future studies will be required to answer these important questions, as well to identify the major zeitgebers affecting the circadian clock of the heart. The SCN, located in the hypothalamus just above the optic chiasm, controls a person's circadian rhythm. As a result, ultradian, circadian, and other body rhythms are important under physiological and pathophysiological conditions. In fact their behavior follows very strict circatidal and circadian rhythms according to the relative moon and sun positions. Although the master's circadian rhythm had been disrupted, and the accident happened at 0540, less than eight hours had elapsed since his last rest and his 72-hour sleep history does not suggest a sleep debt. Acai can also help soften the effects of paraquat on flies' circadian rhythms. This cycle is called the circadian cycle or the biorhythm. The body's circadian clock finally has received some hands. As the body ages, the circadian clock begins to shift back to an earlier schedule, which is why many individuals in this age group report changes in their sleeping patterns that can affect their quality of life. When you travel across time zones, your circadian clock is disrupted from its normal daily patterns and that can cause daytime fatigue, as well as prevent you from getting a good night's sleep. Her research interests are on the role of circadian rhythms in psychiatry, the interaction between circadian rhythms and menstrual cycles, the expression of circadian clock genes in humans, and adaptation to shift work. Summer has much to offer every kind of traveller: push your body and circadian clock to the limit during a late evening lit walking trek, or while away your care-free time on the sandy shores of Lake Laflamme. The circadian rhythm is regulated by light. Does disturbing the circadian rhythm cause health problems? Chronobiology is a hot topic: studying our body's circadian rhythm. What is the cause of the circadian rhythm? The control attachment was done at the low point in the circadian rhythm, when each of the individuals involved would be at their lowest level of alertness, suggesting that fatigue may have been a factor in the occurrence. All on board were accustomed to sleeping at night and were experiencing the lowest point on the circadian rhythm of alertness making them all susceptible to the effects of fatigue. The occurrence pilot experienced two circadian rhythm disruptions between 13 and 16 January 2004 when he flew as a passenger from Toronto to Los Angeles and return, with three time zone changes each way. Provided that he fell asleep immediately and did not wake up at all, which is unlikely due to the circadian rhythm disruptions noted above, the pilot would have slept for a maximum of 5 hours 15 minutes. Show More Sentences Fatigue due to both prolonged wakefulness and disruptions to the circadian rhythm are known to produce similar detriments in performance and cognitive functioning. Since his normal sleep period would have been between 2200 and 0700, at the time of the accident, he was approaching a low point in his circadian rhythm when drowsiness and the effects of fatigue would have been more severe. The flight was conducted during a period in which the crew's circadian rhythm cycle could result in cognitive and physical performance degradation unless recognized and managed. Rev-erb alpha's effects were produced mainly by circadian regulation in brown adipose tissue, commonly called brown fat, the body's furnace. Research into circadian rhythms and sleep indicates that there are maximum sleepiness times and maximum wakefulness times during each 24-hour period. If you mess with your circadian rhythm too much, your energy level will become as unpredictable as a public transit system and you risk a burn out. Serum testosterone levels exhibit ultradian and circadian variation, providing physiologic sources of biologic variability. It brings together two otherwise disparate social groups: responsible folk thinking about Monday's 7am start, and complete wreckheads steaming through their circadian cycles. Dr Lydia DonCarlos from Loyola University, Chicago, one of the experts on the study, says that the circadian rhythm of teenagers naturally shifts to make them feel sleepy later at night and to wake up later. For a bee's sun-based compass to work, the insect must be able to compensate for changes in the sun's direction throughout the day something it does by referencing its own circadian clock. Sleep, the disruption of circadian rhythms and so on clearly influence flight safety as well as the personal health of the members of the flight and cabin crews. This study suggests that total sleep deprivation progressively exposed individual differences in vulnerability to sleep loss or that there was a circadian modulation of these inter-individual differences. It was also thought that, even if the amount of sleep were to be controlled, the different schedules would result in circadian impacts on the quality of sleep obtained. Chronically administered morphine, circadian cyclicity, and intake of an alcoholic beverage. When it comes to the circadian photobiology needs of the individual, the devil is in the details. The most obvious circadian rhythm is the daily cycle of sleep and activity. To summarize, the circadian system, particularly the SCN, controls the circadian pattern of melatonin release in mammals. Dinoflagellate bioluminescence is controlled by a circadian clock and only occurs at night. This structure detects light, maintains circadian rhythms, and controls color changes. House sparrows express strong circadian rhythms of activity in the laboratory. Show More Sentences The suprachiasmatic nuclei of the hypothalamus have also been shown to be an important component of the circadian system of house sparrows. These have helped in finding the proximate causes of circadian and seasonal cycles. As an adaptation to their Arctic environment, they have lost their circadian rhythm. Bright light is what keeps our circadian rhythms in good order. We humans have an endogenous circadian rhythmicity in physiology that is adapted to the solar cycle of day and night. Meal time shift disturbs circadian rhythmicity along with metabolic and behavioral alterations in mice. The objective of this project is to mutagenize and identify every gene that has an altered circadian rhythm function. Fluctuations in physiology and behavior move to the beat of the circadian clock. Once the experimenters re-imposed the 24-hour cycle of light and dark, however, subjects' bodies re-established a 24-hour circadian rhythm. Plants, like animals, have a 24 hour 'body-clock' known as the circadian rhythm. Cortisol is a key regulatory hormone which exhibits a strong circadian rhythm, usually rising in the early morning and falling in the evening. If sleep problems include both wakefulness and sleepiness, it may be best to try to shift the patient's circadian rhythm. These include the clock genes that affect both the persistence and period of circadian rhythms. For instance, what are the circadian rhythms of the individual players and what efforts are made to coordinate the circadian rhythm of the team. Cluster headache is a primary trigeminal-autonomic cephalalgia that exhibits circadian and circannual periodicity. Apparently, it's all down to your circadian rhythm, which is your natural wake and sleep pattern. The peak wavelength for lumens and lux is 555 nm, whereas circadian phototransduction is more strongly influenced by shorter wavelengths. Our previous studies clearly show that desynchronized circadian clocks disrupt the sleep, performance and cardiac parameters of night-shift workers. These cells send information about light intensity to the brain centers that are responsible for coordinating circadian rhythms to patterns of light and dark. A significant association was identified between alterations in the RAR-related orphan receptor beta gene, one of the circadian clock genes, and having bipolar disorder. Show More Sentences The disruption of circadian rhythms has been linked to many pathological conditions, including sleep disorders, depression, metabolic syndrome and cancer. Gene Block of the University of Virginia in Charlottesville and his colleagues study how the body's natural timekeeping, or circadian rhythm, changes with age. Recent studies have demonstrated a link in energy regulation to circadian clock patterns, suggesting a potential role of food timing in the role of obesity. Daily or circadian rhythms include the sleep-wake cycle, and rhythms in hormone release are controlled by a molecular clock that is present in every cell of the human body. At the cellular level, circadian rhythms originate from self-sustained, autoregulated, cyclic expressions of clock genes, which constitute the molecular clock. Experts at fatigue management consultancy Awake based the formula around circadian rhythms, the 24 hour biological clocks that determine our sleeping and waking cycles. There's a special kind of confusion and circadian loopiness that accompanies landing in different countries one after the other without ever seeing daylight. A statistically significant circadian rhythm for urine volume was revealed in 6 of 10 pregnant women in the first trimester and in 6 of 9 puerperas on the 7th puerperal day. They have many important physiological functions such as control hypocotyl growth and the transition to flowering in plants, and regulate the circadian rhythms in mammals. Here are five reasons for night owls to celebrate their circadian rhythm. Phototransduction by retinal ganglion cells that set the circadian clock. Wirz-Justice, who has led numerous investigative studies in the field and lectured on the role of circadian rhythms in affective disorders at the congress. Examples from Classical Literature In general, Tb's showed a marked circadian cycle in phase with photoperiod. Melatonin is a hormone secreted by the pineal gland in the levels and circadian rhythms on successful reproduction in females. Find more words! 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What is the opposite of circadian? Words that rhyme with circadian What is the adverb for circadian? What is the adjective for circadian? Use our Sentence Generator Nearby Words circa circ cir ciprofloxacin Cipro cipro circadian rhythm Circassia Circassian Circassians Circe circean 9-letter Words Starting With c ci cir circ circa circad circadi circadia