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Massimo Gallerani, Marco Pala, Ugo Fedeli
The occurrence of cardiovascular events shows a different distribution during the week, with many studies reporting a Monday peak, possibly related to the role of stress associated with commencing weekly activities. Furthermore, a higher mortality has been observed among patients hospitalized for cardiovascular and other disorders on weekends, a phenomenon known as "weekend effect." Such effect may be explained by a higher level of disease severity among patients admitted over the weekend, and/or by a poorer quality of care associated with shortage of staff, lower experience of personnel, and limited availability of therapeutic and diagnostic procedures...
October 2017: Heart Failure Clinics
Sharon H X Tan, Yu Fan Sim, Chin-Ying S Hsu
Striae periodicity refers to the number of cross-striations between successive lines of Retzius in tooth enamel. A regular time dependency of striae periodicity, known as the circaseptan interval, has been proposed. Previous studies on striae periodicity have been carried out on both modern and early humans given its potential applications in forensic age estimations and anthropology. Nevertheless, research comparing striae periodicities across gender groups and populations in different geographical locations, particularly in Asia, is lacking...
2017: Frontiers in Physiology
H Jonathon Rendina, Ana Ventuneac, Brian Mustanski, Christian Grov, Jeffrey T Parsons
Daily diary and other intensive longitudinal methods are increasingly being used to investigate fluctuations in psychological and behavioral processes. To inform the development of this methodology, we sought to explore predictors of and patterns in diary compliance and behavioral reports. We used multilevel modeling to analyze data from an online daily diary study of 371 gay and bisexual men focused on sexual behavior and substance use. We found that greater education and older age as well as lower frequency of substance use were associated with higher compliance...
August 2016: AIDS and Behavior
Jens Titze, Natalia Rakova, Christoph Kopp, Anke Dahlmann, Jonathan Jantsch, Friedrich C Luft
Sodium balance is achieved within a matter of days and everything that enters should come out; sodium stores are of questionable relevance and sodium accumulation is accompanied by weight gain. Careful balance studies oftentimes conflicted with this view, and long-term studies suggested that total body sodium (TBNa) fluctuates independent of intake or body weight. We recently performed the opposite experiment in that we fixed sodium intake for weeks at three levels of sodium intake and collected all urine made...
July 2016: Nephrology, Dialysis, Transplantation
J Kirchner, S Paule, C Beckendorf, S Achenbach, M Arnold
Thoracic impedance (TI) denotes the electrical resistance that is measured between the right ventricular lead and the can of an implantable cardioverter-defibrillator. It is used in medical diagnostics for fluid load monitoring in heart failure patients. We analysed TI for diurnal and weekly components that go along with the recurrent patterns of daily life.TI was measured in 53 patients over 280 d each with a resolution of 1 h. Information about the patients' professional occupation and typical sleeping rhythm was sought...
July 2015: Physiological Measurement
Jin-Xin He, Diraviyam Thirumalai, Rüdiger Schade, Xiao-Ying Zhang
IgY is the functional equivalent of mammalian IgG found in birds, reptiles and amphibians. Many of its biological aspects have been explored with different approaches. In order to evaluate the rhythmicity of serum and yolk IgY, four chickens were examined and reared under the same conditions. To monitor biological oscillations of IgY in yolk and serum, the eggs and blood samples were collected over a 60 day period and the rhythm of yolk and serum IgY was determined by direct-ELISA. Results indicated that, there is a significant circaseptan rhythm in yolk IgY and circaquattran rhythm in serum IgY...
August 15, 2014: Veterinary Immunology and Immunopathology
M Mikulecky, M Mikulecky
There are three common periodic intervals in the life of each human being from time immemorial: the day, the week and the year. The first one is given by the Earth´s rotation, the latter one by its revolution around the Sun. These both do have clear biomedical counterparts. The 7-day week, basically linguistically "period of change" (or a similar period, e.g.10 days in Egypt or 8 days in Etrutria) was obviously originally considered mainly as a product of a societal agreement. Two groups of Czechoslovak clinicians-scientists, however, noted in forties of the XXth century an approximately week period in human laboratory data, after similar attempts abroad a few years earlier...
2014: Bratislavské Lekárske Listy
John W Ayers, Benjamin M Althouse, Morgan Johnson, Mark Dredze, Joanna E Cohen
BACKGROUND: Biological clocks govern numerous aspects of human health, including weekly clocks-called circaseptan rhythms-that typically include early-week spikes for many illnesses. PURPOSE: To determine whether contemplations for healthy behaviors also follow circaseptan rhythms. METHODS: We assessed healthy contemplations by monitoring Google search queries (2005-2012) in the U.S. that included the word healthy and were Google classified as health-related (e...
July 2014: American Journal of Preventive Medicine
John W Ayers, Benjamin M Althouse, Morgan Johnson, Joanna E Cohen
No abstract text is available yet for this article.
January 2014: JAMA Internal Medicine
Jens Titze, Anke Dahlmann, Kathrin Lerchl, Christoph Kopp, Natalia Rakova, Agnes Schröder, Friedrich C Luft
Current teaching states that when sodium intake is increased from low to high levels, total-body sodium (TBNa) and water increase until daily sodium excretion again equals intake. When sodium intake is reduced, sodium excretion briefly exceeds intake until the excess TBNa and water are eliminated, at which point sodium excretion again equals intake. However, careful balance studies oftentimes conflict with this view and long-term studies suggest that TBNa fluctuates independent of intake or body weight. We recently performed the opposite experiment in that we fixed sodium intake for several weeks at three levels of sodium intake and collected all urine made...
April 2014: Kidney International
Natalia Rakova, Kathrin Jüttner, Anke Dahlmann, Agnes Schröder, Peter Linz, Christoph Kopp, Manfred Rauh, Ulrike Goller, Luis Beck, Alexander Agureev, Galina Vassilieva, Liubov Lenkova, Bernd Johannes, Peter Wabel, Ulrich Moissl, Jörg Vienken, Rupert Gerzer, Kai-Uwe Eckardt, Dominik N Müller, Karl Kirsch, Boris Morukov, Friedrich C Luft, Jens Titze
The steady-state concept of Na(+) homeostasis, based on short-term investigations of responses to high salt intake, maintains that dietary Na(+) is rapidly eliminated into urine, thereby achieving constant total-body Na(+) and water content. We introduced the reverse experimental approach by fixing salt intake of men participating in space flight simulations at 12 g, 9 g, and 6 g/day for months and tested for the predicted constancy in urinary excretion and total-body Na(+) content. At constant salt intake, daily Na(+) excretion exhibited aldosterone-dependent, weekly (circaseptan) rhythms, resulting in periodic Na(+) storage...
January 8, 2013: Cell Metabolism
Akifumi Izumihara
OBJECTIVE: The present study analyzed epidemiological data for patients with subarachnoid hemorrhage (SAH) in a subtropical region of Japan that is the most frequently affected by typhoons. PATIENTS AND METHODS: The medical records of hospitalized patients who had been diagnosed as having SAH at Okinawa Prefectural Yaeyama Hospital during a 13-year period were reviewed. Demographic and epidemiological data including date and time of onset and activity at onset and clinical data were collected...
November 2012: Clinical Neurology and Neurosurgery
J Guan, C You, Y Liu, Y Liu, R Zhang, Z Wang
This retrospective study investigated the circadian and infradian characteristics of blood pressure and heart rate in 26 patients with traumatic head injury in a persistent vegetative state (PVS). Systolic and diastolic blood pressures and heart rate were measured every hour for the first 240 h (10 days) following hospital admission. These data were analysed for the presence of circadian and infradian rhythms using the least-squares fit of the cosine function with the single cosinor method. Infradian rhythms were defined as biological rhythms with a period of approximately 7 days (circaseptan rhythms)...
2011: Journal of International Medical Research
Ying Chen, Wenxi Chen
This study proposes a methodology to detect circaseptan (CS) rhythm in pulse rate (PR) data and to investigate the "Monday effect" in CS rhythm. Daily PR was collected from a middle-aged healthy working woman over one year. PR, SDNN index and sample entropy (SampEn) were chosen as the indexes of PR dynamics. In order to avoid interference from other biorhythms, ensemble empirical mode decomposition (EEMD) method was used to decompose the original PR series into multiple components. And the single cosinor method was applied to fit the detrended component signal...
2011: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
J B López-Messa, J I Alonso-Fernández, J M Andrés-de Llano, J R Garmendia-Leiza, J Ardura-Fernández, F de Castro-Rodríguez, J M Gil-González
OBJECTIVES: To analyze the chronobiological and time variations of out- hospital cardiac arrest (OHCA). DESIGN: A retrospective descriptive study was made. PATIENTS: All cases of OHCA of cardiac origin registered over 18 months in the database of the emergency medical service (EMS) of the Autonomous Community of Castilla y León (Spain) were evaluated. VARIABLES ANALYZED: Age, sex, recovery of spontaneous circulation (ROSC), first monitored rhythm (amenable / not amenable to defibrillation), alert site [(home, public place, primary care (PC) center], alerting person (family, witness, law enforcement member, PC center staff), alert time (0-8; 8-16; 16-24), emergency team activation time, care time and day of the week...
August 2012: Medicina Intensiva
Tanvir Chowdhury Turin, Yoshikuni Kita, Nahid Rumana, Nayouki Takashima, Masaharu Ichikawa, Hideki Sugihara, Yutaka Morita, Kunihiko Hirose, Katsuyuki Miura, Akira Okayama, Yasuyuki Nakamura, Hirotsugu Ueshima
We explored the circaseptan variation in 28-day case-fatalities for patients with subarachnoid hemorrhage (SAH) across days of the week. Data were obtained from the Takashima Stroke Registry, which covers approximately 50000 residents of central Japan. There were 169 first-ever SAH cases registered during the period 1988-2003 (68 in males, 101 in females). We divided the SAH cases into two groups according to the day on which the SAH occurred: "weekend" and "weekday". The 28-day case-fatality rate and 95% confidence interval (CI) were calculated...
July 2010: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
D Pauly, M Dorner, X Zhang, A Hlinak, B Dorner, R Schade
One of the key benefits in using chickens for immunization is the high yield of antibodies obtainable. It is known that egg production decreases over time, while animal maintenance costs remain stable. It would, however, be desirable to keep hens as long as possible to obtain maximal amounts of antibodies. To identify a suitable length of time that animals can be kept and to optimize the cost:yield ratio, we monitored the number of eggs laid, the total amount of chicken IgY, and the specific antibody titer from individually prepared eggs over a 2-yr period...
February 2009: Poultry Science
G Cornélissen, D Watson, G Mitsutake, B Fišer, J Siegelová, J Dušek, Vohlídalová, H Svaèinová, F Halberg
Circadian changes in mood have been described earlier. A positive affect (PA) has been separated from a negative affect (NA), as independent components in opposite admittedly subjective directions, a circadian rhythm characterizing both aspects. Herein, the time structure (chronome) of human mood is re-examined and extended from the circadian to the circaseptan domain by a meta-analysis of data on 196 clinically healthy students who filled out the positive (PA) and negative (NA) affective scale (PANAS), consisting each of 10-item mood scales...
2005: Scripta Medica
T Yamanaka, G Cornélissen, M Kazuma, N Kazuma, S Murakami, K Otsuka, J Siegelová, J Dušek, M Sosíková, F Halberg
In order to investigate any circannual and/or circaseptan variations in birth incidence and birth weight in Toda City (Japan), data on 4,411 consecutive births were obtained from the city's Maternity Hospital between 1 Jan 1999 and 31 Dec 2001. Data were analysed by cosinor separately for babies with birth weights in given ranges, and separately for boys and girls born at different gestational ages. A circannual rhythm was detected with statistical significance (P=0.047) for birth incidence of all vaginal deliveries, with an acrophase in the fall...
2005: Scripta Medica
Erhard Haus
The hemostatic system in its multiple components displays an intricate organization in time which is characterized by circadian (approximately 24-hour), circaseptan (approximately 7-day), menstrual (approximately monthly), and circannual (approximately yearly) bioperiodicities. The interaction of the rhythms of the variables participating in hemostasis determine transient risk states of thromboembolic events, including myocardial infarction and stroke, and of hemorrhage and hemorrhagic events, each with a unique timing...
August 31, 2007: Advanced Drug Delivery Reviews
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