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physiology of aging

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https://www.readbyqxmd.com/read/29156622/advanced-glycation-end-products-in-the-pathogenesis-of-psoriasis
#1
REVIEW
Anastasia Papagrigoraki, Martina Maurelli, Micol Del Giglio, Paolo Gisondi, Giampiero Girolomoni
Advanced glycation end products (AGEs) are extremely oxidant and biologically reactive compounds, which form through oxidation of sugars, lipids and amino acids to create aldehydes that bind covalently to proteins. AGEs formation and accumulation in human tissues is a physiological process during ageing but it is enhanced in case of persistent hyperglycemia, hyperlipidemia and oxidative or carbonyl stress, which are common in patients with moderate to severe psoriasis. Exogenous AGEs may derive from foods, UV irradiation and cigarette smoking...
November 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29156227/low-physiological-arousal-and-high-impulsivity-as-predictors-of-self-injurious-thoughts-and-behaviors-among-adolescents
#2
Jaclyn T Aldrich, Madeline D Wielgus, Amy H Mezulis
Self-injurious thoughts and behaviors are used to escape or regulate aversive physiological states during stress. Low sympathetic nervous system arousal during stress has been shown to confer risk. This risk may be exacerbated by trait impulsivity; adolescents high in impulsivity are more likely to rashly use maladaptive regulation strategies. We examined this relationship longitudinally in a sample of adolescents ages 10 to 14 (55.4% female) from the United States. Consistent with our hypothesis, low arousal during stress and high trait impulsivity interacted to predict the use of self-injurious thoughts and behaviors over a six-month period...
November 17, 2017: Journal of Adolescence
https://www.readbyqxmd.com/read/29156188/addressing-obesity-in-aging-patients
#3
REVIEW
John A Batsis, Alexandra B Zagaria
Obesity in older adults affects not only morbidity and mortality but, importantly, quality of life and the risk of institutionalization. Weight loss interventions can effectively lead to improved physical function. Diet-alone interventions can detrimentally affect muscle and bone physiology and, without interventions to affect these elements, can lead to adverse outcomes. Understanding social and nutritional issues facing older adults is of utmost importance to primary care providers. This article will also discuss the insufficient evidence related to pharmacotherapy as well as providing an overview of using physiologic rather than chronologic age for identifying suitable candidates for bariatric surgery...
January 2018: Medical Clinics of North America
https://www.readbyqxmd.com/read/29156090/a-case-control-study-the-association-of-serum-paraoxonase-1-activity-and-concentration-with-the-development-of-type-2-diabetes-mellitus
#4
J Allen Crow, Edward C Meek, Robert W Wills, Janice E Chambers
BACKGROUND: A longitudinal study assessed serum paraoxonase 1 (PON1) activity and concentration as affected by age and as associated with the development of type 2 diabetes (T2D). PON1's recently established physiological function is the hydrolysis of lipolactones in oxidized LDL particles. METHODS: Serum samples and clinical data collected and stored at different time points over a 20 year interval in the Air Force Health Study were analyzed. PON1 activity and concentration and C-reactive protein (CRP) concentration in samples from the same individuals 20 years apart were compared using a paired t test (n=159)...
November 20, 2017: Diabetes/metabolism Research and Reviews
https://www.readbyqxmd.com/read/29155920/early-pregnancy-perfluoroalkyl-substance-plasma-concentrations-and-birth-outcomes-in-project-viva-confounded-by-pregnancy-hemodynamics
#5
Sharon K Sagiv, Sheryl L Rifas-Shiman, Abby F Fleisch, Thomas F Webster, Antonia M Calafat, Xiaoyun Ye, Matthew W Gillman, Emily Oken
Associations of prenatal exposure to perfluoroalkyl substances (PFASs), ubiquitous chemicals used in stain and water resistant products, with adverse birth outcomes may be confounded by pregnancy hemodynamics. We measured plasma concentrations of four PFASs in early pregnancy (median, 9 weeks) among 1,645 women in Project Viva, a Boston-area cohort recruited 1999-2002. We fit multivariable models to estimate PFAS associations with birth weight-for-gestational age z score and gestation length adjusting for sociodemographic confounders and two hemodynamic markers: 1) plasma albumin, a measure of plasma volume expansion, and 2) plasma creatinine, used to estimate glomerular filtration rate...
November 16, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/29155839/performance-of-thigh-mounted-triaxial-accelerometer-algorithms-in-objective-quantification-of-sedentary-behaviour-and-physical-activity-in-older-adults
#6
Jorgen A Wullems, Sabine M P Verschueren, Hans Degens, Christopher I Morse, Gladys L Onambélé
Accurate monitoring of sedentary behaviour and physical activity is key to investigate their exact role in healthy ageing. To date, accelerometers using cut-off point models are most preferred for this, however, machine learning seems a highly promising future alternative. Hence, the current study compared between cut-off point and machine learning algorithms, for optimal quantification of sedentary behaviour and physical activity intensities in the elderly. Thus, in a heterogeneous sample of forty participants (aged ≥60 years, 50% female) energy expenditure during laboratory-based activities (ranging from sedentary behaviour through to moderate-to-vigorous physical activity) was estimated by indirect calorimetry, whilst wearing triaxial thigh-mounted accelerometers...
2017: PloS One
https://www.readbyqxmd.com/read/29155799/risk-of-prevalent-and-incident-dementia-associated-with-insulin-like-growth-factor-and-insulin-like-growth-factor-binding-protein-3
#7
O P Almeida, G J Hankey, B B Yeap, S A Paul Chubb, J Gollege, L Flicker
Insulin-like growth factor 1 (IGF-1) influences cell proliferation and survival. In the extracellular environment, IGF-1 circulates bound to proteins (IGF-binding proteins; IGFBP), some of which have physiological effects that seem independent of IGF-1, including the brain (for example, IGFBP-3). We completed a systematic review of the association between dementia and IGF-1 and IGFBP-3, and a cross-sectional and longitudinal study designed to investigate if lower plasma concentration of these proteins increased the risk of prevalent and incident dementia...
July 25, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/29155716/evaluation-of-injury-induced-senescence-and-in-vivo-reprogramming-in-the-skeletal-muscle
#8
Coralie Cazin, Aurelie Chiche, Han Li
Cellular senescence is a stress response that is characterized by a stable cellular growth arrest, which is important for many physiological and pathological processes, such as cancer and ageing. Recently, senescence has also been implicated in tissue repair and regeneration. Therefore, it has become increasingly critical to identify senescent cells in vivo. Senescence-associated β-galactosidase (SA-β-Gal) assay is the most widely used assay to detect senescent cells both in culture and in vivo. This assay is based on the increased lysosomal contents in the senescent cells, which allows the histochemical detection of lysosomal β-galactosidase activity at suboptimum pH (6 or 5...
October 26, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29155383/efficacy-of-optical-coherence-tomography-derived-morphometric-assessment-in-predicting-the-physiological-significance-of-coronary-stenosis-head-to-head-comparison-with-intravascular-ultrasound
#9
Eisuke Usui, Taishi Yonetsu, Yoshihisa Kanaji, Masahiro Hoshino, Masao Yamaguchi, Masahiro Hada, Rikuta Hamaya, Yoshinori Kanno, Tadashi Murai, Tetsumin Lee, Tsunekazu Kakuta
AIMS: This study aimed to investigate the diagnostic efficacy of optical coherence tomography (OCT) in identifying functional significance via fractional flow reserve (FFR) compared with that of intravascular ultrasound (IVUS). METHODS AND RESULTS: We investigated 203 de novo intermediate coronary lesions of 186 patients who underwent frequency-domain OCT, IVUS and FFR measurements. Diagnostic efficacy of the minimal lumen area (MLA) obtained by OCT (OCT-MLA) and IVUS (IVUS-MLA) in predicting an FFR<0...
November 21, 2017: EuroIntervention
https://www.readbyqxmd.com/read/29155255/the-role-of-epigenetics-in-cardiovascular-health-and-aging-a-focus-on-physical-activity-and-nutrition
#10
REVIEW
Robert G Wallace, Laura C Twomey, Marc-Antoine Custaud, Jonathan Turner, Niall Moyna, Philip M Cummins, Ronan P Murphy
The cardiovascular system is responsible for transport of blood and nutrients to tissues, and is pivotal to the physiological health and longevity. Epigenetic modification is a natural, age-associated process resulting in highly contextualised gene expression with clear implications for cell differentiation and disease onset. Biological/epigenetic age is independent of chronological age, constituting a highly reflective snapshot of an individual's overall health. Accelerated vascular aging is of major concern, effectively lowering disease threshold...
November 16, 2017: Mechanisms of Ageing and Development
https://www.readbyqxmd.com/read/29154696/applied-machine-learning-method-to-predict-children-with-adhd-using-prefrontal-cortex-activity-a-multicenter-study-in-japan
#11
Akira Yasumura, Mikimasa Omori, Ayako Fukuda, Junichi Takahashi, Yukiko Yasumura, Eiji Nakagawa, Toshihide Koike, Yushiro Yamashita, Tasuku Miyajima, Tatsuya Koeda, Masao Aihara, Hisateru Tachimori, Masumi Inagaki
OBJECTIVE: To establish valid, objective biomarkers for ADHD using machine learning. METHOD: Machine learning was used to predict disorder severity from new brain function data, using a support vector machine (SVM). A multicenter approach was used to collect data for machine learning training, including behavioral and physiological indicators, age, and reverse Stroop task (RST) data from 108 children with ADHD and 108 typically developing (TD) children. Near-infrared spectroscopy (NIRS) was used to quantify change in prefrontal cortex oxygenated hemoglobin during RST...
November 1, 2017: Journal of Attention Disorders
https://www.readbyqxmd.com/read/29154422/beta-blocker-dose-and-markers-of-sympathetic-activation-in-heart-failure-patients-interrelationships-and-prognostic-significance
#12
Alain Cohen-Solal, Arnold F Jacobson, Ileana L Piña
AIMS: Extent of cardiac sympathetic activation can be estimated from physiological parameters, blood biomarkers, and imaging findings. This study examined the prognostic value of three markers of sympathetic activity and their relationship to beta blocker dose in heart failure patients. METHODS AND RESULTS: A post hoc analysis of 858 heart failure subjects in the ADMIRE-HF trial was performed. Variables related to sympathetic activity were plasma norepinephrine, baseline heart rate, the heart to mediastinum (H/M) ratio of (123) I-mIBG uptake, and beta blocker dose...
November 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/29154201/neuroendocrine-disorder-in-chronic-fatigue-syndrome
#13
Slavica Tomic, Snezana Brkic, Dajana Lendak, Daniela Maric, Milica Medic Stojanoska, Aleksandra Novakov Mikic
Background/aim: Neuroendocrine disorders are considered a possible pathogenetic mechanism in chronic fatigue syndrome (CFS). The aim of our study was to determine the function of the hypothalamic-pituitary-adrenal axis (HPA) and thyroid function in women of reproductive age suffering from CFS. Materials and methods: The study included 40 women suffering from CFS and 40 healthy women (15-45 years old). Serum levels of cortisol (0800 and 1800 hours), ACTH, total T4, total T3, and TSH were measured in all subjects...
August 23, 2017: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/29154072/physiological-effects-of-viewing-fresh-red-roses
#14
Chorong Song, Miho Igarashi, Harumi Ikei, Yoshifumi Miyazaki
OBJECTIVES: The present study aimed to clarify the effects of viewing fresh roses on prefrontal cortex activity, autonomic nervous activity and subjective assessments of psychological relaxation. DESIGN: A crossover design, in which each experimental group crosses over from one treatment to another, was used. SETTING AND INTERVENTIONS: A total of 15 female university students (mean age 21.7±1.1years) viewed fresh roses for 3min; the control consisted of no experimental stimulus...
December 2017: Complementary Therapies in Medicine
https://www.readbyqxmd.com/read/29153161/a-100-year-review-a-century-of-dairy-heifer-research
#15
A J Heinrichs, G I Zanton, G J Lascano, C M Jones
The years 1917 to 2017 saw many advances in research related to the dairy heifer, and the Journal of Dairy Science currently publishes more than 20 articles per year focused on heifers. In general, nutrition and management changes made in rearing the dairy heifer have been tremendous in the past century. The earliest literature on the growing heifer identified costs of feeding and implications of growth on future productivity as major concepts requiring further study to improve the overall sustainability of the dairy herd...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153160/a-100-year-review-calf-nutrition-and-management
#16
A F Kertz, T M Hill, J D Quigley, A J Heinrichs, J G Linn, J K Drackley
The first calf paper, published in the May 1919 issue of the Journal of Dairy Science (JDS), described factors affecting birth body weight of different breeds of calves. Other studies were done on nonmilk ingredients, growth charts were developed, and early weaning was followed to conserve milk fed to calves. Calf papers did not report use of statistics to control or record variation or to determine whether treatment means were different. Many experiments were more observational than comparative. Typically fewer than 5 calves, and sometimes 1 or 2 calves, were used per treatment...
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29153025/annals-express-gestational-age-specific-reference-intervals-for-15-biochemical-measurands-during-normal-pregnancy-in-china
#17
Yanpeng Dai, Junjie Liu, Enwu Yuan, Yushan Lee, Quanxian Wang, Liting Jia, Linkai Wang, Yanhua Su
AIMS: Physiological changes that occur during pregnancy can influence biochemical parameters. Therefore, using reference intervals based on specimens from non-pregnant women to interpret laboratory results during pregnancy may be inappropriate. This study aimed to establish essential to establish reference intervals for a range of analytes during pregnancy. METHODS: The cross-sectional study was performed in 13656 healthy pregnant and 2634 non-pregnant women. Fifteen biochemical measurands relating to renal and hepatic function were analyzed using an Olympus AU5400 analyzer (Olympus, Tokyo, Japan)...
January 1, 2017: Annals of Clinical Biochemistry
https://www.readbyqxmd.com/read/29152912/physiological-and-anatomical-dead-space-in-mechanically-ventilated-newborn-infants
#18
Theodore Dassios, Paul Dixon, Ann Hickey, Sotirios Fouzas, Anne Greenough
OBJECTIVES: To compare the anatomical (VD-Ana ) and alveolar dead space (VD-Alv ) in term and prematurely born infants and identify the clinical determinants of those indices. WORKING HYPOTHESIS: VD-Ana and VD-Alv will be higher in prematurely born compared to term born infants. STUDY DESIGN: Retrospective analysis of data collected at King's College Hospital NHS Foundation Trust, London, UK. PATIENT SELECTION: Fifty-six infants (11 term, 45 preterm) were studied at a median age of 8 (IQR 2-33) days...
November 20, 2017: Pediatric Pulmonology
https://www.readbyqxmd.com/read/29152524/young-adult-perceptions-surrounding-hookah-use
#19
Megan E Roberts, Elizabeth G Klein, Micah L Berman, Bilen Berhane, Amy K Ferketich
Objective: We aimed to improve understanding of young adults' perceptions and interpretations of the contexts surrounding use. Methods: We conducted focus groups with young adult hookah users (ages 18-28) to examine hookah-use experiences and risk perceptions. Results: Two dominant themes that emerged from the discussions were the social aspects of use (eg, "ending up" at a hookah café while out with friends), and the mental and physiological reactions to use (eg, relaxation and a "high" feeling)...
November 2017: Health Behavior and Policy Review
https://www.readbyqxmd.com/read/29152193/using-pentosidine-and-hydroxyproline-to-predict-age-and-sex-in-an-avian-species
#20
Brian S Dorr, Randal S Stahl, Katie C Hanson-Dorr, Carol A Furcolow
All living organisms are subject to senescence accompanied by progressive and irreversible physiological changes. The error damage and cross-linking theories suggest that cells and tissues are damaged by an accumulation of cross-linked proteins, slowing down bodily processes and resulting in aging. A major category of these cross-linked proteins are compounds called advanced glycation end products (AGEs). We investigated the relationship between accumulation of the AGE, pentosidine (Ps), and hydroxyproline (HYP) a post-translationally modified amino acid, with age, sex, and breeding status (breeder/nonbreeder) from skin samples of known age (i...
November 2017: Ecology and Evolution
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