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https://www.readbyqxmd.com/read/28651371/sleep-and-physiological-dysregulation-a-closer-look-at-sleep-intraindividual-variability
#1
Bei Bei, Teresa E Seeman, Judith E Carroll, Joshua F Wiley
Study Objectives: Variable daily sleep (i.e., higher intraindividual variability; IIV) is associated with negative health consequences, but potential physiological mechanisms are poorly understood. This study examined the associations between sleep timing, duration, and quality IIV and physiological dysregulation, with diurnal cortisol trajectories as a proximal outcome, and allostatic load (AL) as a multi-system distal outcome. Methods: Participants are 436 adults (Mage±SD=54...
June 23, 2017: Sleep
https://www.readbyqxmd.com/read/28649633/latent-virus-reactivation-in-astronauts-on-the-international-space-station
#2
Satish K Mehta, Mark L Laudenslager, Raymond P Stowe, Brian E Crucian, Alan H Feiveson, Clarence F Sams, Duane L Pierson
Reactivation of latent herpes viruses was measured in 23 astronauts (18 male and 5 female) before, during, and after long-duration (up to 180 days) spaceflight onboard the international space station . Twenty age-matched and sex-matched healthy ground-based subjects were included as a control group. Blood, urine, and saliva samples were collected before, during, and after spaceflight. Saliva was analyzed for Epstein-Barr virus, varicella-zoster virus, and herpes simplex virus type 1. Urine was analyzed for cytomegalovirus...
2017: NPJ Microgravity
https://www.readbyqxmd.com/read/28642165/can-the-way-pigs-are-handled-alter-behavioural-and-physiological-measures-of-affective-state
#3
Ricard Carreras, Laura Arroyo, Eva Mainau, Daniel Valent, Anna Bassols, Antoni Dalmau, Luigi Faucitano, Xavier Manteca, Antonio Velarde
Research on human-animal relationship in animal production has been mainly focused on its effect on stress, productivity and meat quality. Only few studies have assessed its effects on the animals' affective state. In the present study, the influence of positive and negative handling (PH and NH, respectively) on affective state and fear as assessed by the cognitive bias test, the novel object test and the defence cascade test was studied in 56 pigs. Serum, saliva and hair were sampled during the study for the analysis of cortisol concentration...
June 19, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28639804/reflective-functioning-physiological-reactivity-and-overcontrol-in-mothers-links-with-school-aged-children-s-reflective-functioning
#4
Jessica L Borelli, Kajung Hong, Hannah F Rasmussen, Patricia A Smiley
Theorists argue that parental reflective functioning (PRF) is activated in response to emotions, potentially supporting parenting sensitivity even when arousal is high. That is, when parents become emotionally reactive when interacting with their children, those who can use PRF to understand their children's mental states should be able to parent sensitively, which, in turn, should promote children's ability to understand their own mental states. We test this theory by examining whether, in the face of physiological reactivity, mothers' PRF inhibits one form of parenting insensitivity, overcontrol (OC), and whether this process in turn predicts children's RF...
June 22, 2017: Developmental Psychology
https://www.readbyqxmd.com/read/28637032/investigation-of-an-immediate-effect-of-bright-light-on-oxygen-consumption-heart-rate-cortisol-and-%C3%AE-amylase-in-seasonal-affective-disorder-subjects-and-healthy-controls
#5
Iana A Ivanova, Konstantin V Danilenko, Lyubomir I Aftanas
BACKGROUND: Body (fat) mass has been shown to decrease following bright light treatment for overweight women, irrespective of their seasonal (light) dependence. It is not known if this is due to an (immediate) increase of metabolism. METHODS: Ten women with seasonal affective disorder (SAD) and 10 non-SAD women matched by age, body mass index, and menopausal status participated in a laboratory study in the morning, twice within 1-5 days. During one session, bright light (4,300 lx) was presented for 30 min, and during the other session, red light (250 lx "placebo") was used...
June 22, 2017: Neuropsychobiology
https://www.readbyqxmd.com/read/28630705/physiological-effects-of-stress-related-to-helicopter-travel-in-federal-emergency-management-agency-search-and-rescue-canines
#6
E Perry, N Gulson, T-W Liu Cross, K S Swanson
Working canines are deployed by the Federal Emergency Management Agency (FEMA), as part of a National Disaster Response Plan. Stress associated with helicopter flight and the resulting physical effects on the dog are unknown. Our objective was to test the hypotheses that (1) helicopter travel affects the physiology and faecal microbiota of working canines, but that (2) physiological consequences of helicopter travel will not negatively affect their work performance. A total of nine FEMA canines were loaded onto helicopters and flown for 30 min in July 2015...
2017: Journal of Nutritional Science
https://www.readbyqxmd.com/read/28612123/the-influence-of-vitamin-c-on-the-interaction-between-acute-mental-stress-and-endothelial-function
#7
Meghan D Plotnick, Katrina A D'Urzo, Brendon J Gurd, Kyra E Pyke
PURPOSE: To determine whether orally administered vitamin C attenuates expected mental stress-induced reductions in brachial artery endothelial function as measured by flow-mediated dilation (FMD). METHODS: Fifteen men (21 ± 2 years) were given 1000 mg of vitamin C or placebo over two visits in a randomized, double-blinded, within-subject design. Acute mental stress was induced using the Trier Social Stress Test (TSST). Saliva samples for cortisol determination and FMD measures were obtained at baseline, pre-TSST, and 30 and 90-min post-TSST...
June 13, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28601752/daily-positive-events-and-diurnal-cortisol-rhythms-examination-of-between-person-differences-and-within-person-variation
#8
Nancy L Sin, Anthony D Ong, Robert S Stawski, David M Almeida
Growing evidence from field studies has linked daily stressors to dysregulated patterns of diurnal cortisol. Less is known about whether naturally-occurring positive events in everyday life are associated with diurnal cortisol. The objectives of this study were to evaluate daily positive events as predictors of between-person differences and within-person (day-to-day) variations in diurnal cortisol parameters, in addition to daily positive events as buffers against the associations between daily stressors and cortisol...
June 3, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28598957/childhood-adversity-cortisol-levels-and-psychosis-a-retrospective-investigation
#9
Carlo Faravelli, Giovanni Mansueto, Sara Palmieri, Carolina Lo Sauro, Francesco Rotella, Francesco Pietrini, Giulia Fioravanti
Although it has been proposed that the dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis may act as a possible pathway linking early life stress to psychosis, this relationship has not yet been fully confirmed. This study aimed to investigate the relationship between childhood adversity (CA), cortisol levels, and psychosis. Eighty-five patients with psychosis and 170 control subjects were enrolled in the study. CA was evaluated using the Florence Psychiatric Interview, and Childhood Experience of Care and Abuse Questionnaire...
June 8, 2017: Journal of Nervous and Mental Disease
https://www.readbyqxmd.com/read/28593924/influence-of-age-gender-and-body-mass-index-on-late-night-salivary-cortisol-in-healthy-adults
#10
Sabrina Coelli, Camila Bergonsi Farias, Ariana Aguiar Soares, Gabriele Martins Crescente, Vânia Naomi Hirakata, Luiza Barboza Souza, Mauro Antônio Czepielewski, Joíza Lins Camargo, Sandra Pinho Silveiro
BACKGROUND: Late-night salivary cortisol (LNSC) is one of the most reliable tests to screen for endogenous Cushing syndrome. This test is simple, inexpensive and noninvasive and has high sensitivity and specificity. The aim of our study was to analyze the putative influence of age, gender and body mass index (BMI) on LNSC levels in a healthy population. METHODS: Cross-sectional study conducted in healthy adults. Midnight saliva samples were collected at home. Participants refrained from teeth brushing, eating or drinking for 2 h prior to collection...
May 5, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28570489/possible-hormone-predictors-of-physical-performance-in-adolescent-team-sport-athletes
#11
Alanna C Martin, Ian T Heazlewood, Cecilia M Kitic, Isabelle Lys, Liam Johnson
The research aim of this study was to determine possible hormone predictors of physical performance in adolescent team sport athletes. Saliva samples were collected immediately prior to performance testing sessions from 114 state squad athletes (77 male, 37 female) participating in either Australian football, basketball, hockey, or netball. Participants completed tests of aerobic and anaerobic capacity, agility, power and speed. Samples were collected over 22 months at quarterly, six-monthly and/or yearly intervals depending on the testing schedule of the athlete...
May 30, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28570439/cortisol-awakening-response-as-a-prospective-risk-factor-for-depressive-symptoms-in-women-after-treatment-for-breast-cancer
#12
Kate Ryan Kuhlman, Michael R Irwin, Patricia A Ganz, Catherine M Crespi, Laura Petersen, Arash Asher, Julienne E Bower
OBJECTIVE: To investigate hypothalamic-pituitary-adrenal axis (HPA-axis) functioning as a neurobiological risk factor for depressive symptoms in an ongoing longitudinal, observational study of women undergoing treatment and recovery from breast cancer. Many women with breast cancer experience depressive symptoms that interfere with their treatment, recovery, and quality of life. Psychosocial risk factors for depression among cancer patients and survivors have been identified, yet neurobiological risk factors in this population remain largely unexamined...
May 31, 2017: Psychosomatic Medicine
https://www.readbyqxmd.com/read/28570434/the-prospective-association-of-the-diurnal-cortisol-rhythm-with-sleep-duration-and-perceived-sleeping-problems-in-preschoolers-the-generation-r-study
#13
Nathalie S Saridjan, Desana Kocevska, Maartje P C M Luijk, Vincent W V Jaddoe, Frank C Verhulst, Henning Tiemeier
OBJECTIVE: Cortisol, the end product of the hypothalamic-pituitary-adrenal axis, plays an important role in modulating sleep. Yet, studies investigating the association between diurnal cortisol rhythm and sleep patterns in young children are scarce. We tested the hypothesis that the diurnal cortisol rhythm is associated with shorter sleep duration and more sleep problems across early childhood. METHODS: This study was embedded in Generation R, a population-based cohort from fetal life onward...
June 2017: Psychosomatic Medicine
https://www.readbyqxmd.com/read/28568907/anticipated-next-day-demand-affects-the-magnitude-of-the-cortisol-awakening-response-but-not-subjective-or-objective-sleep
#14
Greg J Elder, Nicola L Barclay, Mark A Wetherell, Jason G Ellis
Whilst the association between sleep and stress is well established, few studies have examined the effects of an anticipated stressor upon sleep and relevant physiological markers. The aim of the present study was to examine whether an anticipated stressor in the form of next-day demand affects subjective and objective sleep, and multiple indices of the cortisol awakening response. Subjective and objective sleep and the cortisol awakening response were measured over three consecutive nights in 40 healthy adults in a sleep laboratory...
June 1, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28567696/blunted-stress-reactivity-in-chronic-cannabis-users
#15
Carrie Cuttler, Alexander Spradlin, Amy T Nusbaum, Paul Whitney, John M Hinson, Ryan J McLaughlin
RATIONALE: One of the most commonly cited reasons for chronic cannabis use is to cope with stress. Consistent with this, cannabis users have shown reduced emotional arousal and dampened stress reactivity in response to negative imagery. OBJECTIVES: To our knowledge, the present study represents the first to examine the effects of an acute stress manipulation on subjective stress and salivary cortisol in chronic cannabis users compared to non-users. METHODS: Forty cannabis users and 42 non-users were randomly assigned to complete either the stress or no stress conditions of the Maastricht Acute Stress Test (MAST)...
May 31, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28558282/can-stress-biomarkers-predict-preterm-birth-in-women-with-threatened-preterm-labor
#16
Ana García-Blanco, Vicente Diago, Verónica Serrano De La Cruz, David Hervás, Consuelo Cháfer-Pericás, Máximo Vento
BACKGROUND: Preterm birth is a major paediatric challenge difficult to prevent and with major adverse outcomes. Prenatal stress plays an important role on preterm birth; however, there are few stress-related models to predict preterm birth in women with Threatened Preterm Labor (TPL). OBJECTIVE: The aim of this work is to study the influence of stress biomarkers on time until birth in TPL women. METHODS: Eligible participants were pregnant women between 24 and 31 gestational weeks admitted to the hospital with TPL diagnosis (n=166)...
May 25, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28556577/clinical-and-neurobiological-effects-of-aerobic-exercise-in-dental-phobia-a-randomized-controlled-trial
#17
Brigitt L Lindenberger, Jens Plag, Sarah Schumacher, Katharina Gaudlitz, Sophie Bischoff, Thomas Bobbert, Fernando Dimeo, Moritz B Petzold, Clemens Kirschbaum, Zsuzsa Dudás, Andreas Ströhle
BACKGROUND: Physical activity has shown to be effective in anxiety disorders. For specific phobia, no studies are available that systematically examined the effects of an aerobic exercise intervention on phobic fear within a randomized-controlled design. Therefore, we investigated the acute effect of a standardized aerobic training on clinical symptoms of dental phobia as well as on stress-related neurobiological markers. METHODS: Within a crossover design, 30 patients with dental phobia (mean age: 34...
May 26, 2017: Depression and Anxiety
https://www.readbyqxmd.com/read/28555778/the-feasibility-of-salivary-sample-collection-in-an-international-pediatric-cohort-the-the-teddy-study
#18
Roswith Roth, Judith Baxter, Kendra Vehik, Diane Hopkins, Michael Killian, Patricia Gesualdo, Jessica Melin, Barbara Simell, Elisabeth Strauss, Åke Lernmark, Suzanne Bennett Johnson
Saliva offers a relatively noninvasive method for measuring analytes such as cortisol, holding particular promise for use in pediatric populations on a large scale if a rigorous collection protocol is feasible in diverse settings. The Environmental Determinants of Diabetes in the Young study protocol, conducted in centers in the United States, Sweden, Finland, and Germany, used salivary collection to assess cortisol level as a physiologic marker of stress. Saliva was collected using Sorbettes from subjects at 3...
July 2017: Developmental Psychobiology
https://www.readbyqxmd.com/read/28546677/longitudinal-and-immediate-effect-of-kundalini-yoga-on-salivary-levels-of-cortisol-and-activity-of-alpha-amylase-and-its-effect-on-perceived-stress
#19
Jocelyn N García-Sesnich, Mauricio Garrido Flores, Marcela Hernández Ríos, Jorge Gamonal Aravena
CONTEXT: Stress is defined as an alteration of an organism's balance in response to a demand perceived from the environment. Diverse methods exist to evaluate physiological response. A noninvasive method is salivary measurement of cortisol and alpha-amylase. A growing body of evidence suggests that the regular practice of Yoga would be an effective treatment for stress. AIMS: To determine the Kundalini Yoga (KY) effect, immediate and after 3 months of regular practice, on the perception of psychological stress and the salivary levels of cortisol and alpha-amylase activity...
May 2017: International Journal of Yoga
https://www.readbyqxmd.com/read/28546084/-sex-differences-in-a-real-academic-stressor-cognitive-appraisal-and-the-cortisol-response
#20
Susanne Helbig, Jutta Backhaus
Women and men differ in their physiological and psychological stress response but only a few studies have analyzed this sex difference in a naturalistic setting and focused on cognitive stress appraisal. In the present study, the salivary cortisol concentration of 24 female and 22 male subjects was measured before and several times after an oral academic presentation given by themselves (stress condition) or given by a fellow student (control condition). Feelings of subjective stress and nervousness were assessed simultaneously to the saliva samples and a questionnaire for cognitive stress appraisal was conducted right before the oral presentation...
May 22, 2017: Physiology & Behavior
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