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Seasonal depression

Wei Huang, Ying-Jie Yang, Hong Hu, Shi-Bao Zhang
Low temperature associated with high light can induce photoinhibition of photosystem I (PSI) and photosystem II (PSII). However, the photosynthetic electron flow and specific photoprotective responses in alpine evergreen broad-leaf plants in winter is unclear. We analyzed seasonal changes in PSI and PSII activities, and energy quenching in PSI and PSII in three alpine broad-leaf tree species, Quercus guyavifolia (Fagaceae), Rhododendron decorum (Ericaceae), Euonymus tingens (Celastraceae). In winter, PSII activity remained stable in Q...
October 13, 2016: Journal of Photochemistry and Photobiology. B, Biology
Martin Jastroch, Sylvain Giroud, Perry Barrett, Fritz Geiser, Gerhard Heldmaier, Annika Herwig
Endothermic mammals and birds require intensive energy turnover to sustain high body temperatures and metabolic rates. To cope with energetic bottlenecks associated with the change of seasons, and to minimise energy expenditure, complex mechanisms and strategies, such as daily torpor and hibernation, are used. During torpor metabolic depression and low body temperatures save energy. However, these bouts of torpor lasting for hours to weeks are interrupted by active 'euthermic' phases with high body temperatures...
October 18, 2016: Journal of Neuroendocrinology
Vincent Gouttebarge, Urban Johnson, Pierre Rochcongar, Philippe Rosier, Gino Kerkhoffs
OBJECTIVE: The primary aim of this study was to determine the prevalence and one-season incidence of symptoms of common mental disorders (CMD; distress, anxiety/depression, sleep disturbance, eating disorders, adverse alcohol use) among European professional football referees. A secondary aim was to explore the view of European professional football referees on consequences, support and needs related to these symptoms. METHODS: An observational prospective cohort study with three measurements over a follow-up period of one season (2015-2016) was conducted among central or assistant professional football referees from Belgium, Finland, France, Germany, Norway, Russia, Scotland and Sweden...
October 14, 2016: Physician and Sportsmedicine
Jamie N Connarn, Ruijuan Luo, Jim Windak, Xinyuan Zhang, Andrew Babiskin, Marisa Kelly, Gloria Harrington, Vicki L Ellingrod, Masoud Kamali, Melvin McInnis, Duxin Sun
Bupropion and its three active metabolites exhibit clinical efficacy in the treatment of major depression, seasonal depression, and smoking cessation. The pharmacokinetics of bupropion in humans is highly variable. It is unknown if there are any non-reported metabolites formed in humans in addition to the three known active metabolites. In this paper, we report newly identified and non-reported metabolites of bupropion in human plasma samples. Human subjects were dosed with a single oral dose of 75 mg of an immediate release bupropion HCl tablet...
October 10, 2016: Biopharmaceutics & Drug Disposition
Kathrin H Dausmann, Lisa Warnecke
Torpor, the controlled depression of virtually all bodily function during scarce periods, was verified in primates under free-ranging conditions less than two decades ago. The large variety of different torpor patterns found both within and among closely related species is particularly remarkable. To help unravel the cause of these variable patterns, our review investigates primate torpor use within an evolutionary framework. First, we provide an overview of heterothermic primate species, focusing on the Malagasy lemurs, and discuss their use of daily torpor or hibernation in relation to habitat type and climatic conditions...
November 1, 2016: Physiology
Stefan Perera, Rebecca Eisen, Meha Bhatt, Neera Bhatnagar, Russell de Souza, Lehana Thabane, Zainab Samaan
BACKGROUND: Light therapy is a known treatment for patients with seasonal affective disorder. However, the efficacy of light therapy in treating patients with non-seasonal depression remains inconclusive. AIMS: To provide the current state of evidence for efficacy of light therapy in non-seasonal depressive disorders. METHOD: Systematic review of randomised controlled trials (RCTs) was conducted by searching MEDLINE, EMBASE, PsycINFO, CINAHL, and CENTRAL from their inception to September 2015...
March 2016: BJPsych Open
Joseph H Puyat, Arminee Kazanjian, Hubert Wong, Elliot M Goldner
OBJECTIVES: The use of physician incentives to improve health care, in general, has been extensively studied but its value in mental health care has rarely been demonstrated. In this study the population-level impact of physician incentives on mental health care was estimated using indicators for receipt of counseling/psychotherapy (CP); antidepressant therapy (AT); minimally adequate counseling/psychotherapy; and minimally adequate antidepressant therapy. The incentives' impacts on overall continuity of care and of mental health care were also examined...
September 14, 2016: Medical Care
Vincent Gouttebarge, Haruhito Aoki, Evert A L M Verhagen, Gino M M J Kerkhoffs
OBJECTIVE: To determine the 12-month incidence and comorbidity of symptoms of common mental disorders (CMD) among European professional footballers and to explore the association of potential stressors with the health conditions under study among those European professional footballers. DESIGN: Observational prospective cohort study with a follow-up period of 12 months. PARTICIPANTS: Male professional footballers from 5 European countries (n = 384 at baseline)...
September 12, 2016: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
Nicholas W Pilfold, Daryll Hedman, Ian Stirling, Andrew E Derocher, Nicholas J Lunn, Evan Richardson
Polar bears (Ursus maritimus) have adapted to an annual cyclic regime of feeding and fasting, which is extreme in seasonal sea ice regions of the Arctic. As a consequence of climate change, sea ice breakup has become earlier and the duration of the open-water period through which polar bears must rely on fat reserves has increased. To date, there is limited empirical data with which to evaluate the potential energetic capacity of polar bears to withstand longer fasts. We measured the incoming and outgoing mass of inactive polar bears (n = 142) that were temporarily detained by Manitoba Conservation and Water Stewardship during the open-water period near the town of Churchill, Manitoba, Canada, in 2009-2014...
September 2016: Physiological and Biochemical Zoology: PBZ
Mari Nerhus, Akiah O Berg, Levi R Kvitland, Ingrid Dieset, Sigrun Hope, Sandra R Dahl, Melissa A Weibell, Kristin L Romm, Ann Faerden, Ole A Andreassen, Ingrid Melle
BACKGROUND: There are indications that low S-25(OH)D is associated with increased disease severity in psychotic disorder. Our first aim was to investigate the relations between low S-25(OH)D and positive, negative and depressive symptoms. Our second aim was to explore if associations between S-25(OH)D and symptoms were influenced by levels of inflammatory markers. METHODS: Participants (N=358) with a medical history of one or more psychotic episodes were recruited...
August 29, 2016: Schizophrenia Research
Luna Samanta, Biswaranjan Paital
Natural population of Bufo melanostictus in response to environmental cues shows several physiologic changes such as reproductive activity, hibernation, aestivation and metabolic depression in different seasons. We investigated the effects of seasonal fluctuations on oxidative stress (OS) physiology biomarkers, such as endogenous (ELPx) and induced (ILPx) lipid peroxidation, front-line redox regulatory enzymes (superoxide dismutase: SOD and catalase) and two non-enzyme antioxidant metabolites (ascorbic acid and reduced glutathione) in liver, gonad and cerebral hemisphere of toads collected from the Bhubaneswar area of India, where temperature fluctuates considerably rising to the highest in summer (∼46 °C) and being lowest in winter (<10 °C)...
August 27, 2016: Environmental Science and Pollution Research International
Phan Minh Trang, Joacim Rocklöv, Kim Bao Giang, Maria Nilsson
BACKGROUND: Some studies have shown a relationship between seasonality in weather patterns and depressive and behavioural disorders, especially in temperate climate regions. However, there is a lack of studies describing the seasonal patterns of hospital admissions for a variety of mental disorders in tropical and subtropical nations. The aim of this study has been to examine the relationship between seasons and daily hospital admissions for mental disorders in Hanoi, Vietnam. DESIGNS: A 5-year database (2008-2012) compiled by Hanoi Mental Hospital covering mental disorder admissions diagnosed by the International Classification of Diseases 10 was analysed...
2016: Global Health Action
Gwendolyn K L Wong, C Y Jim
Green roof, an increasingly common constituent of urban green infrastructure, can provide multiple ecosystem services and mitigate climate-change and urban-heat-island challenges. Its adoption has been beset by a longstanding preconception of attracting urban pests like mosquitoes. As more cities may become vulnerable to emerging and re-emerging mosquito-borne infectious diseases, the knowledge gap needs to be filled. This study gauges the habitat preference of vector mosquitoes for extensive green roofs vis-à-vis positive and negative control sites in an urban setting...
August 23, 2016: Science of the Total Environment
Kehinde Eniola, Angela Bacigalupo, Anne Mounsey
While bright light therapy already has a place in the treatment of seasonal affective disorder, a recent trial spotlights its utility beyond the winter months.
July 2016: Journal of Family Practice
Yuanmay Chang, Calvin Lam, Su-Ru Chen, Trevor Sithole, Min-Huey Chung
AIMS AND OBJECTIVES: To investigate the difference between nurses and the general population regarding seasonal variations in sleep disorders (SDs) during 2004-2008. The effects of season and group interaction on SDs with regard to different comorbidities were also examined. BACKGROUND: Studies on seasonal variations in SDs were mainly conducted in Norway for the general population. Furthermore, whether different comorbidities cause seasonal variations in SDs in nurses remains unknown...
August 18, 2016: Journal of Clinical Nursing
Shu-Yi Huang, Huei-Chuan Sung, Hsin-Feng Su
REVIEW QUESTION: What is the effectiveness of bright light therapy (BLT) on depressive symptoms in older adults with non-seasonal depression? REVIEW OBJECTIVE: The review objective is to determine the current evidence related to the effectiveness of BLT on depressive symptoms in older adults with non-seasonal depression.
July 2016: JBI Database of Systematic Reviews and Implementation Reports
Michelle Shardell, Luigi Ferrucci
Instrumental variable (IV) methods have potential to consistently estimate the causal effect of an exposure on an outcome in the presence of unmeasured confounding. However, validity of IV methods relies on strong assumptions, some of which cannot be conclusively verified from observational data. One such assumption is that the effect of the proposed instrument on the outcome is completely mediated by the exposure. We consider the situation where this assumption is violated, but the remaining IV assumptions hold; that is, the proposed IV (1) is associated with the exposure and (2) has no unmeasured causes in common with the outcome...
August 16, 2016: Statistics in Medicine
Matias C A Melo, Rafael L C Abreu, Vicente B Linhares Neto, Pedro F C de Bruin, Veralice M S de Bruin
Despite a complex relationship between mood, sleep and rhythm, the impact of circadian disruptions on bipolar disorder (BD) has not been clarified. The purpose of this systematic review was to define current evidence regarding chronotype and circadian rhythm patterns in BD patients. 42 studies were included, involving 3432 BD patients. Disruption of the biological rhythm was identified, even in drug-naïve BD patients and independently of mood status. Daily profiles of melatonin levels and cortisol indicated a delayed phase...
July 1, 2016: Sleep Medicine Reviews
Jessica G Abell, Tobias Stalder, Jane E Ferrie, Martin J Shipley, Clemens Kirschbaum, Mika Kivimäki, Meena Kumari
Hair cortisol concentrations (HCC) have been suggested to reflect long-term integrated cortisol levels, but most evidence of associations with co-variates is from small samples of healthy volunteers. The objective of this study was to describe the collection of hair samples in a large cohort study and report associations of demographic and health measures with HCC. We examined HCC measured from the 3cm hair segment near the scalp in 3507 participants (aged 59-83y) from The Whitehall II occupational cohort study of British civil servants...
November 2016: Psychoneuroendocrinology
Taro Maeda, Yoshiko Sakamoto
The first record of tracheal mites, Acarapis woodi, in Japan was made in 2010. These mites have since caused serious damage to the colonies of Japanese honey bees, Apis cerana japonica. In the present study, to control the mites on Japanese honey bees with l-menthol, an agent used for European honey bees, Apis mellifera, we investigated (1) the seasonality of menthol efficacy, (2) the overwintering mortality of menthol-treated colonies, and (3) the menthol residue in honey under field conditions in cooperation with private beekeepers of Japanese honey bees...
November 2016: Experimental & Applied Acarology
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