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Physiology & Behavior

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https://www.readbyqxmd.com/read/27894796/cognitive-challenges-aging-and-neuromuscular-fatigue
#1
Ashley E Shortz, Ranjana K Mehta
Cognitive challenges, such as concurrent cognitive demands or prior cognitive fatigue, have shown to adversely impact neuromuscular fatigue, specifically in younger adults. Whether these relationships are similar for the aging population remains unclear. The aim of the study was to investigate the effects of different cognitive challenges on handgrip fatigue with aging. Ten younger (24.10 (1.79) years) and ten older (75.90 (7.80) years) females attended three experimental conditions (control, i.e., exercise only, cognitive fatigue prior to exercise, and concurrent mental arithmetic during exercise) on different days...
November 25, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27890591/circadian-waveform-bifurcation-but-not-phase-shifting-leaves-cued-fear-memory-intact
#2
E M Harrison, S A Carmack, C L Block, J Sun, S G Anagnostaras, M R Gorman
In mammals, memory acquisition and retrieval can be affected by time of day, as well as by manipulations of the light/dark cycle. Under bifurcation, a manipulation of circadian waveform, two subjective days and nights are experimentally induced in rodents. We examined the effect of bifurcation on Pavlovian fear conditioning, a prominent model of learning and memory. Here we demonstrate that bifurcation of the circadian waveform produces a small deficit in acquisition, but not on retrieval of fear memory. In contrast, repeated phase-shifting in a simulated jet-lag protocol impairs retrieval of memory for cued fear...
November 25, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27890592/small-particle-size-lipid-emulsions-satiety-and-energy-intake-in-lean-men
#3
Y K Chan, S C Budgett, A K MacGibbon, S Y Quek, S Kindleysides, S D Poppitt
Lipid emulsions have been proposed to suppress hunger and food intake. Whilst there is no consensus on optimal structural properties or mechanism of action, small particle size (small-PS) stable emulsions may have greatest efficacy. Fabuless®, a commercial lipid emulsion reported in some studies to decrease energy intake (EI), is a small-PS, 'hard' fat emulsion comprising highly saturated palm oil base (PS, 82nm). To determine whether small-PS dairy lipid emulsions can enhance satiety, firstly, we investigated 2 'soft' fat emulsions generated using dairy and soy emulsifying agents (PS, 114nm and 121nm) and a non-emulsified dairy control...
November 24, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27890590/can-cleanerfish-overcome-temptation-a-selective-role-for-dopamine-influence-on-cooperative-based-decision-making
#4
Marta C Soares, Sónia C Cardoso, João T Malato, João P M Messias
Evidence suggests that animals are selected to make accurate choices and prioritize goals within the constraints of a given social environment to maximize fitness. These decisions are mostly based on complex processes in which value is linked to reward and cues may carry variable incentive salience. However, the level in which the incentive elicited by a cue is able to shift individual choices should differ between individuals and neurophysiological states. Here we used a notorious cooperative cleanerfish species Labroides dimidiatus to probe for differences in the incentive motivational valences given to food cues and then tested for the role of the dopaminergic system in the appraisal of such cues...
November 24, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27890589/aged-mice-receiving-caffeine-since-adulthood-show-distinct-patterns-of-anxiety-related-behavior
#5
Paulo Henrique S Botton, Daniela Pochmann, Andreia S Rocha, Fernanda Nunes, Amanda S Almeida, Daniela M Marques, Lisiane O Porciúncula
Caffeine is the psychostimulant most consumed worldwide. Anxiogenic effects of caffeine have been described in adult animalswith controversial findings about its anxiogenic potential. Besides, the effects of caffeine on anxiety with aging are still poorly known. In this study, adult mice (6months old) started to receive caffeine (0.3 and 1.0mg/mL, drinking water) during 12-14months only in the light cycle and at weekdays. The open field (OF) and elevated plus maze (EPM) testing were used to determine the effects of caffeine on anxiety-related behavior in adult and aged mice (18-20months old)...
November 24, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27890588/aerobic-and-resistance-exercise-reinforcement-and-discomfort-tolerance-predict-meeting-activity-guidelines
#6
Kyle D Flack, LuAnn Johnson, James N Roemmich
BACKGROUND: Understanding individual-differences of those people who do and do not meet physical activity recommendations could inform targets for increasing physical activity. Exercise reinforcement may be one such individual-level determinate, but it is not yet known whether those who meet activity guidelines have a greater relative reinforcing value (RRV) of aerobic exercise training (RRVAT) or resistance training (RRVRT). The predictors of RRVAT or RRVRT are also not yet known. PURPOSE: To determine whether individuals who meet aerobic activity or muscle strengthening activity guidelines have greater RRVAT or RRVRT and whether the preference and tolerance for exercise intensity predicts RRVAT or RRVRT...
November 24, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27889332/effect-of-an-aerobic-exercise-intervention-on-cardiac-autonomic-regulation-a-worksite-rct-among-cleaners
#7
David M Hallman, Andreas Holtermann, Karen Søgaard, Peter Krustrup, Jesper Kristiansen, Mette Korshøj
OBJECTIVE: The aim of this randomized controlled trial (RCT) was to determine whether aerobic exercise during work hours affects cardiac autonomic regulation in cleaners characterized by high levels of occupational physical activity and poor cardiorespiratory fitness. METHOD: Eligible cleaners (n=116) were randomized to an aerobic exercise group (n=59) or a reference group (n=57) with lectures. The intervention group received two 30-min sessions per week of supervised aerobic exercise over 4months...
November 23, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27889331/portulaca-oleracea-l-prevents-lipopolysaccharide-induced-passive-avoidance-learning-and-memory-and-tnf-%C3%AE-impairments-in-hippocampus-of-rat
#8
Maryam Noorbakhshnia, Leila Karimi-Zandi
There is a growing body of evidence that neuroinflammation can impair memory. It has been indicated that Portulaca oleracea Linn. (POL), possess anti-inflammatory activity and might improve memory disruption caused by inflammation. In this study the effect of pre-treatment with the hydro-alcoholic extract of POL on memory retrieval investigated in lipopolysaccharide (LPS) treated rats. Male Wistar rats (200-220g) received either a control diet or a diet containing of POL (400mg/kg, p.o.) for 14days. Then, they received injections of either saline or LPS (1mg/kg, i...
November 24, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27887996/effects-of-erythropoietin-on-neonatal-hypoxia-ischemia-brain-injury-in-rat-model
#9
Qing Ren, Zhong-Hui Jiang, Xing-Fang Zhang, Qiao-Zhi Yang
BACKGROUND: Hypoxic-ischemic (HI) injury to the developing brain remains a major cause of morbidity. To date, few therapeutic strategies could provide complete neuroprotection. Erythropoietin (EPO) has been shown to be beneficial in several models of neonatal HI. This study examines the effect of treatment with erythropoietin on postnatal day 2 (P2) rats introduced with HI injury. METHOD: Rats at P2 were randomized into four groups: sham, bilateral carotid artery occlusion (BCAO), BCAO + early EPO, and BCAO + late EPO groups...
November 23, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27887994/tactile-stimulation-during-sleep-alters-slow-oscillation-and-spindle-densities-but-not-motor-skill
#10
Sofia Isabel Ribeiro Pereira, Felipe Beijamini, Frederik D Weber, Roberta Almeida Vincenzi, Felipe Augusto Cini da Silva, Fernando Mazzilli Louzada
Studies using targeted memory reactivation have shown that presentation of auditory or olfactory contextual cues during sleep can bias hippocampal reactivations towards the preferential replay of the cue-associated material, thereby resulting in enhanced consolidation of that information. If the same cortical ensembles are indeed used for encoding and storage of a given piece of information, forcing the sleeping brain to re-engage in task-intrinsic information processing should disturb the natural ongoing consolidation processes and therefore impair possible sleep benefits...
November 23, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27887998/the-intricacies-of-the-renin-angiotensin-system-in-metabolic-regulation
#11
REVIEW
Erin B Bruce, Annette D de Kloet
Over recent years, the renin-angiotensin-system (RAS), which is best-known as an endocrine system with established roles in hydromineral balance and blood pressure control, has emerged as a fundamental regulator of many additional physiological and pathophysiological processes. In this manuscript, we celebrate and honor Randall Sakai's commitment to his trainees, as well as his contribution to science. Scientifically, Randall made many notable contributions to the recognition of the RAS's roles in brain and behavior...
November 22, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27887997/a-role-for-leptin-regulated-neurocircuitry-in-subordination-stress
#12
REVIEW
Jonathan N Flak
The visible burrow system produces a distinct combination of psychological and metabolic stress on, primarily, subordinate individuals that results in pronounced physiologic and behavioral dysfunction. However, the mechanisms underlying the consequences of chronic subordination stress are largely unknown. The simplest mechanistic explanation is that adaptations within brain systems with overlapping functions of both psychological and metabolic control provide immediate benefits that result in lasting susceptibility to diseases, disorders, and increased mortality rates in subordinates...
November 22, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27887995/chronic-stress-and-hippocampal-dendritic-complexity-methodological-and-functional-considerations
#13
REVIEW
Cheryl D Conrad, J Bryce Ortiz, Jessica M Judd
The current understanding of how chronic stress impacts hippocampal dendritic arbor complexity and the subsequent relationship to hippocampal-dependent spatial memory is reviewed. A surge in reports investigating hippocampal dendritic morphology is occurring, but with wide variations in methodological detail being reported. Consequently, this review systematically outlines the basic neuroanatomy of relevant hippocampal features to help clarify how chronic stress or glucocorticoids impact hippocampal dendritic complexity and how these changes occur in parallel with spatial cognition...
November 22, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27884589/cohabitation-with-an-ehrlich-tumor-bearing-cagemate-induces-immune-but-not-behavioral-changes-in-male-mice
#14
Thalita R M Machado, Glaucie J Alves, Wanderley M Quinteiro-Filho, João Palermo-Neto
Cohabitation with Ehrlich ascitic tumor-injected conspecifics induces behavioral, neurochemical, endocrine and immune changes indicative of stress and immune impairment in female mice. The present work analyzed the effects of similar cohabitation in Swiss and Balb/C male mice. At least 12 pairs of male mice were divided into a control group and an experimental group. On experimental day 1 (ED1), one animal within each experimental pair was inoculated with 5×10(6) Ehrlich tumor cells intraperitoneally (i.p...
November 22, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27884590/physical-activity-induced-protection-against-breast-cancer-risk-associated-with-delayed-parity
#15
Kathleen M Sturgeon, Aaron Schweitzer, John J Leonard, Deirdre K Tobias, Ying Liu, Elizabeth Cespedes Feliciano, Vasanti S Malik, Amit Joshi, Bernard Rosner, Bart C De Jonghe
Epidemiological evidence indicates that physical activity between menarche and first pregnancy is associated with a lower risk of breast cancer among women with at least 20years between these reproductive events. The mechanism by which physical activity during this interval confers protection is unknown. This study used a novel animal model to assess potentially protective effects of physical activity on tumor development in delayed parity. Thirty-six female Sprague Dawley rats received an i.p. injection of 50mg/kg N-methyl-N-nitrosourea (MNU) at 5weeks of age...
November 21, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27884588/colour-preference-between-adults-and-children-during-a-dental-treatment-session
#16
Magrur Kazak
BACKGROUND: It is evidently shown that colour has physical, psychological and sociological effects on human beings. There are many studies showing the effects of colours on brain activity. Colour preferences may change from childhood to adulthood and are significantly different in various age groups. The aim of this study was to evaluate the adults and children in their preference for mouthrinses in various colours under stress condition during a dental treatment session. METHODS: 240 adults and 263 children were included in the study...
November 21, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27876640/physiological-state-tunes-mesolimbic-signaling-lessons-from-sodium-appetite-and-inspiration-from-randall-r-sakai
#17
REVIEW
Samantha M Fortin, Mitchell F Roitman
Sodium deficit poses a life-threatening challenge to body fluid homeostasis and generates a sodium appetite - the behavioral drive to ingest sodium. Dr. Randall R. Sakai greatly contributed to our understanding of the hormonal responses to negative sodium balance and to the central processing of these signals. Reactivity to the taste of sodium solutions and the motivation to seek and consume sodium changes dramatically with body fluid balance. Here, we review studies that collectively suggest that sodium deficit recruits the mesolimbic system to play a role in the behavioral expression of sodium appetite...
November 19, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27876639/behavioral-changes-in-male-mice-fed-a-high-fat-diet-are-associated-with-il-1%C3%AE-expression-in-specific-brain-regions
#18
Camila P Almeida-Suhett, Alice Graham, Yifan Chen, Patricia Deuster
High-fat diet (HFD)-induced obesity is associated with not only increased risk of metabolic and cardiovascular diseases, but cognitive deficit, depression and anxiety disorders. Obesity also leads to low-grade peripheral inflammation, which plays a major role in the development of metabolic alterations. Previous studies suggest that obesity-associated central inflammation may underlie the development of neuropsychiatric deficits, but further research is needed to clarify this relationship. We used 36 male C57BL/6J mice to investigate whether chronic consumption of a high-fat diet leads to increased expression of interleukin-1β (IL-1β) in the hippocampus, amygdala and frontal cortex...
November 19, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27876638/changes-in-acoustic-startle-reflex-in-rats-induced-by-playback-of-22-khz-calls
#19
Hideaki Inagaki, Takahiro Ushida
In aversive or dangerous situations, adult rats emit long characteristic ultrasonic calls, often termed "22-kHz calls," which have been suggested to play the role of alarm calls. Although the playback experiment is one of the most effective ways to investigate the alarming properties of 22-kHz calls, clear behavioral evidence showing the anxiogenic effects of these playback stimuli has not been obtained to date. In this study, we investigated whether playback of 22-kHz calls or synthesized sine tones could change the acoustic startle reflex (ASR), enhancement of which is widely considered to be a reliable index of anxiety-related negative affective states in rats...
November 19, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27876637/fourth-ventricle-injection-of-ghrelin-decreases-angiotensin-ii-induced-fluid-intake-and-neuronal-activation-in-the-paraventricular-nucleus-of-the-hypothalamus
#20
Kimberly S Plyler, Derek Daniels
Ghrelin acts in the CNS to decrease fluid intake under a variety of dipsogenic and natriorexigenic conditions. Previous studies on this topic, however, focused on the forebrain as a site of action for this effect of ghrelin. Because the hindbrain contains neural substrates that are capable of mediating the well-established orexigenic effects of ghrelin, the current study tested the hypothesis that ghrelin applied to the hindbrain also would affect fluid intake. To this end, water and saline intakes were stimulated by central injection of angiotensin II (AngII) in rats that also received injections of ghrelin (0...
November 19, 2016: Physiology & Behavior
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