共查询到20条相似文献，搜索用时 15 毫秒
1.
Ana I Esquifino Fernando Chacón Vanessa Jimenez Carlos F Reyes Toso Daniel P Cardinali 《Journal of circadian rhythms》2004,2(1):1
Background
This work analyzes the effect of social isolation (a mild stressor) on the 24-h variation of pituitary-testicular function in young Wistar rats, assessed by measuring circulating levels of prolactin, FSH, LH and testosterone. 相似文献2.
Background
This study describes the 24-h changes in plasma prolactin levels, and dopamine (DA), serotonin (5HT), gamma-aminobutyric acid (GABA) and taurine concentration in median eminence and adenohypophysis of newborn male rabbits. 相似文献3.
Efficacy and hypnotic effects of melatonin in shift-work nurses: double-blind,placebo-controlled crossover trial 总被引：1，自引：0，他引：1
Khosro Sadeghniiat-Haghighi Omid Aminian Gholamreza Pouryaghoub Zohreh Yazdi 《Journal of circadian rhythms》2008,6(1):10
Background
Night work is associated with disturbed sleep and wakefulness, particularly in relation to the night shift. Circadian rhythm sleep disorders are characterized by complaints of insomnia and excessive daytime sleepiness that are primarily due to alterations in the internal circadian timing system or a misalignment between the timing of sleep and the 24-h social and physical environment. 相似文献4.
Barbara A Murphy Ann-Marie Martin Penney Furney Jeffrey A Elliott 《Journal of circadian rhythms》2011,9(1):3
Background
In contrast to studies showing gradual adaptation of melatonin (MT) rhythms to an advanced photoperiod in humans and rodents, we previously demonstrated that equine MT rhythms complete a 6-h light/dark (LD) phase advance on the first post-shift day. This suggested the possibility that melatonin secretion in the horse may be more strongly light-driven as opposed to endogenously rhythmic and light entrained. The present study investigates whether equine melatonin is endogenously rhythmic in extended darkness (DD). 相似文献5.
Mitsuo Nagane Kazunori Yoshimura Shu-Ichi Watanabe Masahiko Nomura 《Journal of circadian rhythms》2009,7(1):10-4
Background
Students suffering from psychosomatic symptoms, including drowsiness and feelings of melancholy, often have basic lifestyle problems. The aim of this study was to investigate whether psychosomatic complaints may be related to circadian dysfunction. 相似文献6.
Background
Adenosine 5-triphosphate (ATP) and its breakdown products ADP and adenosine can act as extracellular messengers in a range of biological processes. Extracellular adenine nucleotides are metabolized by a number of enzymes including NTPDases and 5'-nucleotidase, which are considered to be the major regulators of purinergic signaling in the blood. Previous work by our group demonstrated that ATPase and ADPase activities in rat serum exhibit a 24-h temporal pattern, with higher enzyme activity during the dark (activity) phase. It was found that stress can cause disruptions in biological circadian rhythms and in the cardiovascular system. Therefore, the aim of the present study was to examine the influence of acute stress exposure upon temporal patterns of NTPDase and 5-nucleotidase enzyme activities in rat blood serum.Methods
Adult male Wistar rats were divided into 4 groups: ZT0, ZT6, ZT12 and ZT18. Each group was subdivided in 4 groups: control, immediately, 6 h and 24 h after one hour of restraint stress. ATP, ADP and AMP hydrolysis were assayed in the serum.Results
All stressed groups showed significant decreases in all enzyme activities at ZT 12 and ZT 18 when compared with control.Conclusion
Acute stress provokes a decrease in nucleotidase activities dependent on the time that this stress occurs and this effect appears to persist for at least 24 hours. Stress can change levels of nucleotides, related to increased frequency of cardiovascular events during the activity phase. Altered levels of nucleotides in serum may be involved in cardiovascular events more frequent during the activity phase in mammals, and with their etiology linked to stress. 相似文献7.
Barbara A Murphy Jeffrey A Elliott Dawn R Sessions Mandi M Vick Erin L Kennedy Barry P Fitzgerald 《Journal of circadian rhythms》2007,5(1):5-9
Background
Rapid displacement across multiple time zones results in a conflict between the new cycle of light and dark and the previously entrained program of the internal circadian clock, a phenomenon known as jet lag. In humans, jet lag is often characterized by malaise, appetite loss, fatigue, disturbed sleep and performance deficit, the consequences of which are of particular concern to athletes hoping to perform optimally at an international destination. As a species renowned for its capacity for athletic performance, the consequences of jet lag are also relevant for the horse. However, the duration and severity of jet lag related circadian disruption is presently unknown in this species. We investigated the rates of re-entrainment of serum melatonin and core body temperature (BT) rhythms following an abrupt 6-h phase advance of the LD cycle in the horse. 相似文献8.
Marc Girondot Philippe Rivalan Ronald Wongsopawiro Jean-Paul Briane Vincent Hulin Stéphane Caut Elodie Guirlet Matthew H Godfrey 《BMC ecology》2006,6(1):11-12
Background
Marine turtles deposit their eggs on tropical or subtropical beaches during discrete nesting seasons that span several months. The number and distribution of nests laid during a nesting season provide vital information on various aspects of marine turtle ecology and conservation. 相似文献9.
Background
Very little is known about the perinatal genesis of circadian rhythmicity in the human fetus. Some researchers have found evidence of rhythmicity early on in fetal development, whereas others have observed a slow development of rhythmicity during several years after birth. 相似文献10.
Background
We investigated the effects of energetic constraints on the breeding behaviour of male European treefrogs Hyla arborea and how calling males allocated additional energy supplied by feeding experiments. 相似文献11.
Hamdan H Al-Jahdali Haithm A Khogeer Waleed A Al-Qadhi Salim Baharoon Hani Tamim Fayez F Al-Hejaili Saeed M Al-Ghamdi Abdullah A Al-Sayyari 《Journal of circadian rhythms》2010,8(1):7
Background
Studies have shown that insomnia is a common sleep disorder among patients with end-stage renal disease (ESRD). This study aimed to assess the prevalence of insomnia in Saudi patients with ESRD who are on maintenance dialysis. 相似文献12.
Background
Daylight saving time is widely adopted. Little is known about its influence on the daily rest-activity cycles. We decided to explore the effects of transition into daylight saving time on the circadian rhythm of activity. 相似文献13.
Tatsushi Kimura Tsutomu Inamizu Kiyokazu Sekikawa Masayuki Kakehashi Kiyoshi Onari 《Journal of circadian rhythms》2009,7(1):7-6
Background
Numerous processes in the living body exhibit daily rhythmicity. In this study, we characterized a daily rhythm of blood fluidity and identified its determinants. 相似文献14.
Armin M Stroebel Matthias Bergner Udo Reulbach Teresa Biermann Teja W Groemer Ingo Klein Johannes Kornhuber 《Journal of circadian rhythms》2010,8(1):10
Background
Animals, including humans, exhibit a variety of biological rhythms. This article describes a method for the detection and simultaneous comparison of multiple nycthemeral rhythms. 相似文献15.
Background
The rapid expansion in the availability of genome and DNA sequence information has opened up new possibilities for the development of methods for detecting free-living protozoa in environmental samples. The protozoan Blepharisma japonicum was used to investigate a rapid and simple detection system based on polymerase chain reaction amplification (PCR) from organisms immobilised on FTA paper. 相似文献16.
Gregory D Roach Kathryn J Reid Sally Ferguson Drew Dawson 《Journal of circadian rhythms》2006,4(1):8-5
Background
The aim of the study was to examine the role that melatonin production plays in the regulation of sleep consolidation in a population of shiftworkers working and sleeping in their natural environments. 相似文献17.
Background
The effects of lighting on the human circadian system are well-established. The recent discovery of 'non-visual' retinal receptors has confirmed an anatomical basis for the non-image forming, biological effects of light and has stimulated interest in the use of light to enhance wellbeing in the corporate setting. 相似文献18.
Keny Vanlalhriatpuia Vanlalnghaka Chhakchhuak Satralkar K Moses SB Iyyer MS Kasture AJ Shivagaje Barnabas J Rajneesh Dilip S Joshi 《Journal of circadian rhythms》2007,5(1):1-11
Background
We recently reported that the altitude of origin altered the photic and thermal sensitivity of the circadian pacemaker controlling eclosion and oviposition rhythms of high altitude Himalayan strains of Drosophila ananassae. The present study was aimed at investigating the effects of altitude of origin on the pacemaker controlling the adult locomotor activity rhythm of D. helvetica. 相似文献19.
Katsutaka Oishi Naoki Ohkura Koji Kadota Manami Kasamatsu Kentaro Shibusawa Juzo Matsuda Kazuhiko Machida Shuichi Horie Norio Ishida 《Journal of circadian rhythms》2006,4(1):13-7
Background
Although the number of circulating immune cells is subject to high-amplitude circadian rhythms, the underlying mechanisms are not fully understood. 相似文献20.
Refinetti R 《Journal of circadian rhythms》2005,3(1):4