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cortisol cycle

J Tortosa-Martínez, C Manchado, J M Cortell-Tormo, I Chulvi-Medrano
Exercise has been shown to reduce the risk of developing Mild Cognitive Impairment and Alzheimer's disease as well as to improve cognition in healthy and cognitively impaired individuals. However, the mechanisms of these benefits are not well understood. The stress hypothesis suggests that the cognitive benefits attributed to exercise may partially be mediated by changes in the cortisol secretion pattern. Chronic stress may increase the risk of AD and exacerbate the cognitive deficits and brain pathology characteristic of the condition while physical activity has been shown to attenuate most of stress consequences and risk factors for AD...
November 2018: Neurobiology of Stress
Daniil V Popov, Pavel A Makhnovskii, Nadia S Kurochkina, Evgeny A Lysenko, Tatiana F Vepkhvadze, Olga L Vinogradova
We investigated acute exercise-induced gene expression in skeletal muscle adapted to aerobic training. Vastus lateralis muscle samples were taken in ten endurance-trained males prior to, and just after, 4 h, and 8 h after acute cycling sessions with different intensities, 70% and 50% <mml:math xmlns:mml=""> <mml:mrow> <mml:msub> <mml:mrow> <mml:mover> <mml:mtext>V</mml:mtext> <mml:mo>˙</mml:mo> </mml:mover> <mml:mtext>O</mml:mtext> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> <mml:mi>max</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> ...
September 2018: Biology of Sport
Diah Tri Widayati, Pradita Iustitia Sitaresmi, Sigit Bintara, Budi Prasetyo Widyobroto
BACKGROUND AND OBJECTIVE: In goats, weak estrus behavior is potentially caused by a decline in reproductive efficiency. In the present study, aim was to measure the vaginal pH to determine the accuracy of lust detection in Saanen Etawah crossbreed goats. MATERIALS AND METHODS: Thirteen Saanen Etawah crossbred does (Capra hircus) with body condition score of 2-3 were used. The dose were fed concentrate, provided forage and water ad libitum. The experiment was conducted during the natural estrous cycle...
January 2018: Pakistan Journal of Biological Sciences: PJBS
Liat Morgan, Eyal Klement, Shiri Novak, Elad Eliahoo, Ahmad Younis, Gila Abells Sutton, Wiessam Abu-Ahmad, Tal Raz
In many countries sows are kept in individual stalls from insemination up to just few days prior to farrowing. The overall objective of this study was to examine group housing management system for sows during gestation as an alternative for individual confinement stalls, and the possible effects on their welfare, production and reproduction performances. Accordingly, the study included three specific objectives: (1) to compare parameters of production, reproduction, and welfare of sows housed in groups (either 30 or 7 sows/group; Large Group: LG, Small Group: SG, respectively) during gestation as compared to individual confinement stalls (IS); (2) to compare saliva cortisol of pregnant sows throughout gestation, when housed in groups of three different sizes (either 7, 15 or 30 sows per pen group); and (3) to compare sows' production and reproduction performances at the herd level, before, during and after practically transforming from a management of individual confinement stalls to a group housing system, in a large commercial swine farm over a six-year period...
November 15, 2018: Preventive Veterinary Medicine
Karen B Strier, Toni E Ziegler
The northern muriqui (Brachyteles hypoxanthus) is a critically endangered species endemic to the Atlantic Forest of southeastern Brazil. Long-term observational studies of wild muriquis have provided many insights into the behavioral ecology and life history of this species. However, nearly everything that is currently known about the northern muriqui's behavioral endocrinology has come from combining our respective expertise in noninvasive field and laboratory research. Here, we reflect on the history of our collaboration, focusing on major challenges, key scientific findings, and factors that contributed to its success...
October 30, 2018: American Journal of Primatology
Rodrigo Fortes-Silva, Fabiola De Oliveira Paes Leme, Túlio Pacheco Boaventura, Helena Corrêa Pinto De Mendonça, Jane Prado Leite Moreira, Pedro Hugo Henriques Cunha, Ronald Kennedy Luz
The aim of this study was to investigate the daily rhythms of hematological, biochemical and enzymatic parameters of the blood of a nocturnal model of fish (Lophiosilurus alexandri) bred in the laboratory (F1). Thirty-six juveniles were stocked in six tanks of a recirculation aquaculture system for 20 days. The fish were exposed to a light:dark cycle of 12:12 h and were fed 1% of biomass twice a day with commercial diet. The daily rhythms of hematological, biochemical and enzymatic parameters were then measured at six sampling times "zeitgeber time = ZT" at four-hour intervals under light:dark 12:12 h (lights on = ZT0, at 8...
October 29, 2018: Chronobiology International
Karoline S Nørstrud, Marco A Vindas, Göran E Nilsson, Ida B Johansen
Cardiac disease is a growing concern in farmed animals, and stress has been implicated as a factor for myocardial dysfunction and mortality in commercial fish rearing. We recently showed that the stress hormone cortisol induces pathological cardiac remodelling in rainbow trout. Wild and farmed salmonids are exposed to fluctuations and sometimes prolonged episodes of increased cortisol levels. Thus, studying the timeframe of cortisol-induced cardiac remodelling is necessary to understand its role in the pathogenesis of cardiovascular disease in salmonids...
October 19, 2018: Biology Open
Hikmat Permana, Guntur Darmawan, Ervita Ritonga, Maya Kusumawati, Miftahurachman Miftahurachman, Nanny Natalia Soetedjo
Adrenocortical carcinoma (ACC) is a rare solid tumor with an incidence of 0.5 to 2 cases per million per year. It affects women more commonly than men with a ratio of 1.5:1. Ectopic ACC are considered to be extremely rare with no exact incidence data yet. We report an interesting case of hepatic ACC in a young woman with clinical signs of virilization.A-21-year old Sundanese woman visited our endocrine clinic with progressive hirsutism over the face, body, and extremities starting 14 years previously. She had irregular, heavy periods when she was 7 years old...
July 2018: Acta Medica Indonesiana
R T Casey, O Giger, I Seetho, A Marker, D Pitfield, L H Boyle, M Gurnell, A Shaw, M Tischowitz, E R Maher, V K Chatterjee, T Janowitz, G Mells, P Corrie, B G Challis
CONTEXT: Metastatic adrenocortical carcinoma (ACC) is an aggressive malignancy with a poor prognosis and limited therapeutic options. A subset of ACC is due to Lynch syndrome, an inherited tumor syndrome resulting from germline mutations in mismatch repair (MMR) genes. It has been demonstrated that several cancers characterized by MMR deficiency are sensitive to immune checkpoint inhibitors that target PD-1. Here, we provide the first report of PD-1 blockade with pembrolizumab in a patient with Lynch syndrome and progressive cortisol-secreting metastatic ACC...
June 21, 2018: Seminars in Oncology
Kathleen E Hunt, Nadine S J Lysiak, Cory J D Matthews, Carley Lowe, Alejandro Fernández Ajó, Danielle Dillon, Cornelia Willing, Mads Peter Heide-Jørgensen, Steven H Ferguson, Michael J Moore, C Loren Buck
Male baleen whales have long been suspected to have annual cycles in testosterone, but due to difficulty in collecting endocrine samples, little direct evidence exists to confirm this hypothesis. Potential influences of stress or adrenal stress hormones (cortisol, corticosterone) on male reproduction have also been difficult to study. Baleen has recently been shown to accumulate steroid hormones during growth, such that a single baleen plate contains a continuous, multi-year retrospective record of the whale's endocrine history...
2018: Conservation Physiology
Elizabeth V Goldfarb, Alexa Tompary, Lila Davachi, Elizabeth A Phelps
Acute stress can modulate memory for individual parts of an event (items), but whether it similarly influences memory for associations between items remains unclear. We used a within-subjects design to explore the influence of acute stress on item and associative memory in humans. Participants associated negative words with neutral objects, rated their subjective arousal for each pair, and completed delayed item and paired associative recognition tasks. We found strikingly different patterns of acute stress effects on item and associative memory: for high-arousal pairs, preencoding stress enhanced associative memory, whereas postencoding stress enhanced item memory...
September 17, 2018: Journal of Experimental Psychology. General
Karyn Geralyn Butler
Affective disorders impact women's health, with a lifetime prevalence of over twelve per cent. They have been correlated with reproductive cycle factors, under the regulation of hormonal circadian rhythms. In affective disorders, circadian rhythms may become desynchronized. The circadian rhythms of cortisol and estradiol may play a role in affective disorders. The purpose of this study was to explore the temporal relationship between the rhythms of cortisol and estradiol and its relationship to affect. It was hypothesized that a cortisol-estradiol phase difference (PD) exists that correlates with optimal affect...
February 21, 2018: Journal of Circadian Rhythms
Janek S Lobmaier, Urs Fischbacher, Urs Wirthmüller, Daria Knoch
Individuals are thought to have their own distinctive body odour which reportedly plays an important role in mate choice. In the present study we investigated individual differences in body odours of women and examined whether some women generally smell more attractive than others or whether odour preferences are a matter of individual taste. We then explored whether levels of reproductive hormones explain women's body odour attractiveness, to test the idea that body odour attractiveness may act as a chemosensory marker of reproductive fitness...
September 12, 2018: Proceedings. Biological Sciences
Martin I Antov, Ursula Stockhorst
Stress is a potent modulator of learning and memory. Factors contributing to whether stress aids or impairs memory are timing of the stressor, memory stage, form of memory studied, and sex of the subjects. The female sex hormone 17-beta-estradiol (E2) has widespread effects in the brain and affects hippocampus-dependent memory in animals. In humans, the interaction between stress effects and E2 has not been widely studied. We report data from a healthy sample divided into 3 hormone-status groups: free-cycling women in the early follicular phase (EF: low E2, low progesterone [P4]), or during midcycle (MC: high E2, low P4), and men...
August 30, 2018: Neurobiology of Learning and Memory
Thomas Markos Chouzouris, Eleni Ntovolou, Constantinos A Rekkas, Panagiotis Georgoulias, Lambrini V Athanasiou, Georgios S Amiridis
In two experiments, we studied a) the changes of LH secretion in heifers under different feeding schedules, and b) total ghrelin concentration at estrus in cows and heifers. In experiment one, synchronized heifers were allocated in 3 groups (R, regularly fed controls; F, fasted; and F-F fasted - fed). One day after the completion of the estrus induction protocol, group F and F-F animals stayed without feed for 24h; thereafter, feed was provided to R and F-F cattle; 2 hours later GnRH was administered to all animals...
September 1, 2018: Reproduction in Domestic Animals, Zuchthygiene
Ponnusamy Nandhakumar, Al-Monsur Jiaul Haque, Nam-Sihk Lee, Young Ho Yoon, Haesik Yang
Simple and sensitive competitive immunosensors for small molecules are difficult to obtain, especially in serum containing numerous interfering species (ISs) with different concentrations. Herein, we report a washing-free and sensitive (competitive) displacement immunosensor for cortisol in human serum, based on electron mediation of Os(bpy)2 Cl2 between an electrode and a redox label [oxygen-insensitive diaphorase (DI)] (i.e., electrochemical-enzymatic redox cycling). The anticortisol IgG-DI conjugate bound to a cortisol-immobilized electrode is displaced by competitive binding of cortisol in serum and diffuses away from the electrode during incubation; therefore, the concentration of the displaced conjugate near the electrode becomes very low, even without washing...
September 18, 2018: Analytical Chemistry
Sonnet S Jonker, Daniel Kamna, Dan Loturco, Jenai Kailey, Laura D Brown
Placental insufficiency causes intrauterine growth restriction (IUGR), a common complication of pregnancy. In skeletal muscle, IUGR reduces fetal myofibril size, reduces myoblast proliferation, and reduces expression of genes in cell cycle regulation clusters. The myocardium is striated like skeletal muscle, and IUGR also reduces cell cycle activity and maturation in cardiomyocytes, despite cardiac output preferentially directed to the coronary circulation. We hypothesized that cardiomyocyte growth restriction would be accompanied by similar changes in cell cycle regulation genes, and would reduce cardiomyocyte cell cycle activity, number, maturity and size...
August 24, 2018: Journal of Endocrinology
Felipe Rydygier de Ruediger, Paulo Henrique Yamada, Luiz Gustavo Bicas Barbosa, Marcelo George Mungai Chacur, João Carlos Pinheiro Ferreira, Nelcio Antonio Tonizza de Carvalho, Gabriela Azenha Milani Soriano, Viviane Maria Codognoto, Eunice Oba
The objective of this study was to evaluate variations in the orbital area, muzzle and vulva surface temperatures and progesterone (P4) concentrations during follicular and luteal phases in Murrah buffalo and whether these temperatures are influenced by the weather patterns. Forty cows were submitted to P4-based hormonal protocol. After P4 device withdrawal transrectal ultrasonography and infrared digital thermography were performed daily until day 16 and on days 20, 24, 28 and 32 to follow the ovulation as well as the vulva, orbital area and muzzle temperatures...
October 2018: Animal Reproduction Science
Herpreet Thind, Joseph L Fava, Kate M Guthrie, Laura Stroud, Geetha Gopalakrishnan, Marie Sillice, Naama Gidron, Beth C Bock
Diabetes is the seventh leading cause of death in the United States. For most patients, medication alone is not sufficient to achieve glycemic control; attention must also be paid to multiple healthy behaviors including diet, regular physical activity, and stress management. Yoga, a mindfulness practice with emphasis on relaxation, meditation, and deep breathing, may have special relevance to people with type 2 diabetes mellitus (T2DM). Yoga practice may positively affect stress and other self-care tasks that will contribute to improved glycemic control...
November 2018: International Journal of Yoga Therapy
Ewa Cyranska-Chyrek, Dorota Filipowicz, Ewelina Szczepanek-Parulska, Marta Nowaczyk, Urszula Ambroziak, Sadegh Toutounchi, Łukasz Koperski, Tomasz Bednarczuk, Blazej Meczekalski, Marek Ruchała
Hypercortisolemia in females may lead to menstrual cycle disturbances, infertility, hirsutism and acne. Herewith, we present a 18-year-old patient, who was diagnosed due to weight gain, secondary amenorrhea, slowly progressing hirsutism, acne and hot flashes. Thorough diagnostics lead to a conclusion, that the symptoms was the first manifestation of primary pigmented nodular adrenocortical disease (PPNAD). All symptoms of Cushing syndrome including hirsutism and menstrual disturbances resolved after bilateral adrenalectomy...
August 21, 2018: Gynecological Endocrinology
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