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Alterations to the copulatory sequence in young adult male Sprague–Dawley rats administered a ketogenic diet 摄入生酮饮食的年轻成年雄性 Sprague-Dawley 大鼠交配顺序的改变。
IF 2.4 3区 医学
Physiology & Behavior Pub Date : 2024-07-27 DOI: 10.1016/j.physbeh.2024.114650
Christina Tzianabos, Grace Chouinard, Luis Martinez
{"title":"Alterations to the copulatory sequence in young adult male Sprague–Dawley rats administered a ketogenic diet","authors":"Christina Tzianabos,&nbsp;Grace Chouinard,&nbsp;Luis Martinez","doi":"10.1016/j.physbeh.2024.114650","DOIUrl":"10.1016/j.physbeh.2024.114650","url":null,"abstract":"<div><p>Ketogenic diets (KDs) have shown therapeutic potential for a range of neuropsychiatric disorders; however, there is insufficient data regarding the behavioral impacts of KDs in healthy populations. Here, we examined the impact of a KD on sexual behavior in young adult male Sprague-Dawley rats maintained on either a KD or standard chow diet (SD). We found that KD males exhibited higher mount rates, higher intromission rates (third and fourth tests only), and lower ejaculation likelihood (second test only) compared to SD males. Consequently, it may be that experience-dependent changes in the processing of sexual stimuli are not occurring as efficiently in KD males, thereby yielding the observed copulatory sequence alterations.</p></div>","PeriodicalId":20201,"journal":{"name":"Physiology & Behavior","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141793170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pubertal stress in male rats: Effects on juvenile play behavior and adult sexual partner preference 雄性大鼠的青春期压力:对幼年玩耍行为和成年性伴侣偏好的影响
IF 2.4 3区 医学
Physiology & Behavior Pub Date : 2024-07-26 DOI: 10.1016/j.physbeh.2024.114649
Yessica Zuleima León-Ahumada , Deissy Herrera-Covarrubias , Luis I. García , Rebeca Toledo-Cárdenas , Fausto Rojas-Durán , Jorge Manzo , Genaro A. Coria-Avila
{"title":"Pubertal stress in male rats: Effects on juvenile play behavior and adult sexual partner preference","authors":"Yessica Zuleima León-Ahumada ,&nbsp;Deissy Herrera-Covarrubias ,&nbsp;Luis I. García ,&nbsp;Rebeca Toledo-Cárdenas ,&nbsp;Fausto Rojas-Durán ,&nbsp;Jorge Manzo ,&nbsp;Genaro A. Coria-Avila","doi":"10.1016/j.physbeh.2024.114649","DOIUrl":"10.1016/j.physbeh.2024.114649","url":null,"abstract":"<div><p>Puberty is a period of brain organization impacting the expression of social and sexual behaviors. Here, we assessed the effects of an acute pubertal stressor (immune challenge) on the expression of juvenile play (short-term) and sexual partner preference (long-term) in male rats. Juvenile play was assessed over ten trials at postnatal days (PND) (31–40) with age- and sex-matched conspecifics, and at PND35 males received a single injection of lipopolysaccharide (LPS, 1.5 mg/kg i.p.) or saline. Then, sexual partner preference was assessed at PND 60, 64, and 68, in a three-compartment chamber with a sexually receptive female and a male as potential partners simultaneously. The results confirmed that a single injection of LPS during puberty induced sickness signs indicative of an immune challenge. However, juvenile play was not affected by LPS treatment during the following days (PND36–40), nor was sexual behavior and partner preference for females in adulthood. These findings highlight that, while other studies have shown that LPS-induced immunological stress during puberty affects behavior and neuroendocrine responses, it does not affect juvenile play and sexual behavior in male rats. This suggests a remarkable resilience of these behavioral systems for adaptation to stressful experiences mediated by immune challenges during critical periods of development. These behaviors, however, might be affected by other types of stress.</p></div>","PeriodicalId":20201,"journal":{"name":"Physiology & Behavior","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141788860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of physical activity on olfaction acuity: A systematic review 体育锻炼对嗅觉敏锐度的影响:系统回顾
IF 2.4 3区 医学
Physiology & Behavior Pub Date : 2024-07-25 DOI: 10.1016/j.physbeh.2024.114648
Mathieu Cournoyer , Alexandre-Charles Gauthier , Alice Maldera , Fabien Dal Maso , Marie-Eve Mathieu
{"title":"Effect of physical activity on olfaction acuity: A systematic review","authors":"Mathieu Cournoyer ,&nbsp;Alexandre-Charles Gauthier ,&nbsp;Alice Maldera ,&nbsp;Fabien Dal Maso ,&nbsp;Marie-Eve Mathieu","doi":"10.1016/j.physbeh.2024.114648","DOIUrl":"10.1016/j.physbeh.2024.114648","url":null,"abstract":"<div><p>Olfaction acuity, which includes detection thresholds, discrimination and identification, appears to decline with age, obesity, and various neurological disorders. Knowing that smell influences energy intake, there is a growing interest in protecting this sense. Physical activity could be a key intervention to counteract the loss of olfaction. This systematic review aims to explore the literature on the effect of physical activity on olfaction acuity. The search strategy consisted of using index terms and keywords in MEDLINE, EMBASE, EBM Reviews - Cochrane Central Register of Controlled Trials, CINAHL, SPORTDiscus, and Web of Science search engine. Data from 17 trials involving 10,861 participants showed that physical activity improved olfaction thresholds, discrimination, identification and perceived intensity. Regular practice of physical activity seemed to have better effects on olfaction components than acute exercise. Although this review has clarified the evidence on the effects of physical activity on olfaction, better methodological consistency is needed.</p></div>","PeriodicalId":20201,"journal":{"name":"Physiology & Behavior","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0031938424001963/pdfft?md5=494927c3e4f9ff63b2b1e7f0d8db30ff&pid=1-s2.0-S0031938424001963-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141767195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Behavioral tests of the insulin-cholinergic-dopamine link in nucleus accumbens and inhibition by high fat-high sugar diet in male and female rats 行为测试雄性和雌性大鼠凹凸核中的胰岛素-胆碱能-多巴胺联系以及高脂高糖饮食的抑制作用
IF 2.4 3区 医学
Physiology & Behavior Pub Date : 2024-07-25 DOI: 10.1016/j.physbeh.2024.114647
Sydney P. Weiner , Kenneth D. Carr
{"title":"Behavioral tests of the insulin-cholinergic-dopamine link in nucleus accumbens and inhibition by high fat-high sugar diet in male and female rats","authors":"Sydney P. Weiner ,&nbsp;Kenneth D. Carr","doi":"10.1016/j.physbeh.2024.114647","DOIUrl":"10.1016/j.physbeh.2024.114647","url":null,"abstract":"<div><p>It was previously shown in striatal slices obtained from male rats that insulin excites cholinergic interneurons and increases dopamine (DA) release via α4β2 nicotinic receptors on DA terminals. The effect of insulin on DA release was blocked either by maintaining rats on a high sugar-high fat (HS-HF) diet that induced hyperinsulinemia and nucleus accumbens (NAc) insulin receptor insensitivity, or applying the α4β2 antagonist DHβE<em>. In vivo</em>, NAc shell insulin inactivation decreased a glucose lick microstructure parameter indicative of hedonic impact in male and female rats, and prevented flavor-nutrient learning, tested only in males. The HS-HF diet decreased hedonic impact in males but not females, and prevented flavor-nutrient learning, tested only in males. The present study extends testing to more fully assess the translation of brain slice results to the behaving rat. Insulin inactivation by antibody microinjection in NAc shell was found to decrease the number of lick bursts emitted and average lick burst size, measures of incentive motivation and hedonic impact respectively, for a wide range of glucose concentrations in male and female rats. In contrast, the HS-HF diet decreased these lick parameters in males but not females. Follow-up two-bottle choice tests for 10 % versus 40 % glucose showed decreased intake of both concentrations by males but increased intake of 40 % glucose by females. In a further set of experiments, it was predicted that α4β2 receptor blockade would induce the same behavioral effects as insulin inactivation. In females, DHβE microinjection in NAc shell decreased both lick parameters for glucose as predicted, but in males only the number of lick bursts emitted was decreased. DHβE also decreased the number of lick bursts emitted for saccharin by females but not males. Finally, DHβE microinjection in NAc shell decreased flavor-nutrient learning in both sexes. The few discrepancies seen with regard to the hypothesized insulin-nicotinic-dopaminergic regulation of behavioral responses to nutritive sweetener, and its inhibition by HS-HF diet, are discussed with reference to sex differences in DA dynamics, female resistance to diet-induced metabolic morbidities, and extra-striatal cholinergic inputs to NAc.</p></div>","PeriodicalId":20201,"journal":{"name":"Physiology & Behavior","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141788859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Manipulation of feeding patterns in high fat diet fed rats improves microbiota composition dynamics, inflammation and gut-brain signaling 操纵高脂饮食喂养大鼠的喂养模式可改善微生物群组成动态、炎症和肠脑信号传导。
IF 2.4 3区 医学
Physiology & Behavior Pub Date : 2024-07-25 DOI: 10.1016/j.physbeh.2024.114643
E.A. Klingbeil , R. Schade , S.H. Lee , R. Kirkland , C.B. de La Serre
{"title":"Manipulation of feeding patterns in high fat diet fed rats improves microbiota composition dynamics, inflammation and gut-brain signaling","authors":"E.A. Klingbeil ,&nbsp;R. Schade ,&nbsp;S.H. Lee ,&nbsp;R. Kirkland ,&nbsp;C.B. de La Serre","doi":"10.1016/j.physbeh.2024.114643","DOIUrl":"10.1016/j.physbeh.2024.114643","url":null,"abstract":"<div><p>Chronic consumption of high fat (HF) diets has been shown to increase meal size and meal frequency in rodents, resulting in overeating. Reducing meal frequency and establishing periods of fasting, independently of caloric intake, may improve obesity-associated metabolic disorders. Additionally, diet-driven changes in microbiota composition have been shown to play a critical role in the development and maintenance of metabolic disorders. In this study, we used a pair-feeding paradigm to reduce meal frequency and snacking episodes while maintaining overall intake and body weight in HF fed rats. We hypothesized that manipulation of feeding patterns would improve microbiota composition and metabolic outcomes. Male Wistar rats were placed in three groups consuming either a HF, low fat diet (LF, matched for sugar), or pair-fed HF diet for 7 weeks (<em>n</em> = 11–12/group). Pair-fed animals received the same amount of food consumed by the HF fed group once daily before dark onset (HF-PF). Rats underwent oral glucose tolerance and gut peptide cholecystokinin sensitivity tests. Bacterial DNA was extracted from the feces collected during both dark and light cycles and sequenced via Illumina MiSeq sequencing of the 16S V4 region. Our pair-feeding paradigm reduced meal numbers, especially small meals in the inactive phase, without changing total caloric intake. This shift in feeding patterns reduced relative abundances of obesity-associated bacteria and maintained circadian fluctuations in microbial abundances. These changes were associated with improved gastrointestinal (GI) function, reduced inflammation, and improved glucose tolerance and gut to brain signaling. We concluded from these data that targeting snacking may help improve metabolic outcomes, independently of energy content of the diet and hyperphagia.</p></div>","PeriodicalId":20201,"journal":{"name":"Physiology & Behavior","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141767196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Clavulanic acid inhibits methamphetamine locomotor sensitization in mice and normalizes methamphetamine-induced changes in glutaminase mRNA levels in the nucleus accumbens 克拉维酸可抑制小鼠对甲基苯丙胺的运动敏感性,并使甲基苯丙胺诱导的脑核谷氨酰胺酶 mRNA 水平变化趋于正常。
IF 2.4 3区 医学
Physiology & Behavior Pub Date : 2024-07-23 DOI: 10.1016/j.physbeh.2024.114646
Taylor Hawthorne Walters , Sonita Wiah , Aryan Shekarabi , Mia Milton , Samhitha Reddy , Pingwei Zhao , Prateek S. Mokkarala , Raghava Potula , Scott M. Rawls
{"title":"Clavulanic acid inhibits methamphetamine locomotor sensitization in mice and normalizes methamphetamine-induced changes in glutaminase mRNA levels in the nucleus accumbens","authors":"Taylor Hawthorne Walters ,&nbsp;Sonita Wiah ,&nbsp;Aryan Shekarabi ,&nbsp;Mia Milton ,&nbsp;Samhitha Reddy ,&nbsp;Pingwei Zhao ,&nbsp;Prateek S. Mokkarala ,&nbsp;Raghava Potula ,&nbsp;Scott M. Rawls","doi":"10.1016/j.physbeh.2024.114646","DOIUrl":"10.1016/j.physbeh.2024.114646","url":null,"abstract":"<div><p>Clavulanic acid (CLAV) is a component of Augmentin® that preserves antibiotic efficacy by inhibiting β-lactamase activity. It also enhances cellular glutamate uptake and is a potential CNS therapeutic. Because increased glutamate transmission in brain reward circuits facilitates methamphetamine (METH) locomotor activation and sensitization, we tested the hypothesis that CLAV inhibits acute and sensitized locomotor responses to METH in mice and investigated effects of CLAV on METH-induced changes in glutaminase, the major glutamate-producing enzyme in the brain. Acute METH (3 mg/kg) produced hyperlocomotion that was reduced by CLAV (20 mg/kg but not 10 mg/kg). Mice injected with METH (3 mg/kg) every other day for 9 d and then challenged with METH 27 d later displayed locomotor sensitization. CLAV (10 mg/kg), when injected 15 min before each METH injection during the 9-d exposure interval, blocked locomotor sensitization induced by METH challenge. In METH-sensitized mice, mRNA levels of both isoforms of glutaminase (GLS and GLS2) were altered in the nucleus accumbens compared to mice exposed to a single injection of METH (i.e.<em>,</em> GLS decreased and GLS2 increased). CLAV normalized the METH-induced GLS deficit but not the increase in GLS2. In summary, CLAV reduced acute and sensitized locomotor responses to METH and normalized the METH-induced reduction of GLS gene expression in the NAC. Given that glutaminases belong to the β-lactamase superfamily and CLAV is a β-lactamase inhibitor, our data point toward studying glutaminase as a therapeutic target of CLAV.</p></div>","PeriodicalId":20201,"journal":{"name":"Physiology & Behavior","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141760557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Female rodents in behavioral neuroscience: Narrative review on the methodological pitfalls 行为神经科学中的雌性啮齿动物:关于方法论陷阱的叙述性综述。
IF 2.4 3区 医学
Physiology & Behavior Pub Date : 2024-07-22 DOI: 10.1016/j.physbeh.2024.114645
Marcela Becegato , Regina H. Silva
{"title":"Female rodents in behavioral neuroscience: Narrative review on the methodological pitfalls","authors":"Marcela Becegato ,&nbsp;Regina H. Silva","doi":"10.1016/j.physbeh.2024.114645","DOIUrl":"10.1016/j.physbeh.2024.114645","url":null,"abstract":"<div><p>Since the NIH ‘Sex as biological variable’ policy, the percentage of studies including female subjects have increased largely. Nonetheless, many researchers fail to adequate their protocols to include females. In this narrative review, we aim to discuss the methodological pitfalls of the inclusion of female rodents in behavioral neuroscience. We address three points to consider in studies: the manipulations conducted only in female animals (such as estrous cycle monitoring, ovariectomy, and hormone replacement), the consideration of males as the standard, and biases related to interpretation and publication of the results. In addition, we suggest guidelines and perspectives for the inclusion of females in preclinical research.</p></div>","PeriodicalId":20201,"journal":{"name":"Physiology & Behavior","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141760558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The growth hormone secretagogue receptor 1a agonists, anamorelin and ipamorelin, inhibit cisplatin-induced weight loss in ferrets: Anamorelin also exhibits anti-emetic effects via a central mechanism 生长激素分泌受体 1a 激动剂 anamorelin 和 ipamorelin 可抑制顺铂引起的雪貂体重下降:anamorelin 还可通过中枢机制发挥止吐作用。
IF 2.4 3区 医学
Physiology & Behavior Pub Date : 2024-07-21 DOI: 10.1016/j.physbeh.2024.114644
Zengbing Lu , Man P. Ngan , Julia Y.H Liu , Lingqing Yang , Longlong Tu , Sze Wa Chan , Claudio Giuliano , Emanuela Lovati , Claudio Pietra , John A. Rudd
{"title":"The growth hormone secretagogue receptor 1a agonists, anamorelin and ipamorelin, inhibit cisplatin-induced weight loss in ferrets: Anamorelin also exhibits anti-emetic effects via a central mechanism","authors":"Zengbing Lu ,&nbsp;Man P. Ngan ,&nbsp;Julia Y.H Liu ,&nbsp;Lingqing Yang ,&nbsp;Longlong Tu ,&nbsp;Sze Wa Chan ,&nbsp;Claudio Giuliano ,&nbsp;Emanuela Lovati ,&nbsp;Claudio Pietra ,&nbsp;John A. Rudd","doi":"10.1016/j.physbeh.2024.114644","DOIUrl":"10.1016/j.physbeh.2024.114644","url":null,"abstract":"<div><p>This study investigated whether ghrelin mimetics, namely anamorelin and ipamorelin, can alleviate weight loss and inhibition of feeding observed during acute and delayed phases of cisplatin-induced emesis in ferrets. The potential of anamorelin to inhibit electrical field stimulation (EFS)-induced contractions of isolated ferret ileum was compared with ipamorelin. In other experiments, ferrets were administered anamorelin (1–3 mg/kg), ipamorelin (1–3 mg/kg), or vehicle intraperitoneally (i.p.) 30 s before cisplatin (5 mg/kg, i.p.) and then every 24 h, and their behaviour was recorded for up to 72 h. Food and water consumption was measured every 24 h. The effect of anamorelin (10 µg) was also assessed following intracerebroventricular administration. Anamorelin and ipamorelin inhibited EFS-induced contractions of isolated ileum by 94.4 % (half-maximal inhibitory concentration [IC<sub>50</sub>]=14.0 µM) and 54.4 % (IC<sub>50</sub>=11.7 µM), respectively. Neither of compounds administered i.p. had any effect on cisplatin-induced acute or delayed emesis, but both inhibited associated cisplatin-induced weight loss on the last day of delayed phase (48–72 h) by approximately 24 %. Anamorelin (10 µg) administered intracerebroventricularly reduced cisplatin-induced acute emesis by 60 % but did not affect delayed emesis. It also improved food and water consumption by approximately 20 %–40 % during acute phase, but not delayed phase, and reduced associated cisplatin-induced weight loss during delayed phase by ∼23 %. In conclusion, anamorelin and ipamorelin administered i.p. had beneficial effects in alleviating cisplatin-induced weight loss during delayed phase, and these effects were seen when centrally administered anamorelin. Anamorelin inhibited cisplatin-induced acute emesis following intracerebroventricular but not intraperitoneal administration, suggesting that brain penetration is important for its anti-emetic mechanism of action.</p></div>","PeriodicalId":20201,"journal":{"name":"Physiology & Behavior","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Control of fluid intake in dehydrated rats and evolution of sodium appetite 控制脱水大鼠的液体摄入量和钠食欲的变化
IF 2.4 3区 医学
Physiology & Behavior Pub Date : 2024-07-18 DOI: 10.1016/j.physbeh.2024.114642
Laurival A. De Luca Jr. , Michel Laurin , José Vanderlei Menani
{"title":"Control of fluid intake in dehydrated rats and evolution of sodium appetite","authors":"Laurival A. De Luca Jr. ,&nbsp;Michel Laurin ,&nbsp;José Vanderlei Menani","doi":"10.1016/j.physbeh.2024.114642","DOIUrl":"10.1016/j.physbeh.2024.114642","url":null,"abstract":"<div><p>The objective of the present work is to examine from a new perspective the existence of causal factors not predicted by the classical theory that thirst and sodium appetite are two distinct motivations. For example, we ask why water deprivation induces sodium appetite, thirst is not “water appetite”, and intracellular dehydration potentially causes sodium appetite. Contrary to the classical theory, we suggest that thirst first, and sodium appetite second, designate a temporal sequence underlying the same motivation. The single motivation becomes an “intervenient variable” a concept borrowed from the literature, fully explained in the text, between causes of dehydration (extracellular, intracellular, or both together), and respective behavioral responses subserved by hindbrain-dependent inhibition (e.g., lateral parabrachial nucleus) and forebrain facilitation (e.g., angiotensin II). A corollary is homology between rat sodium appetite and marine teleost thirst-like motivation that we name “protodipsia”. The homology argument rests on similarities between behavior (salty water intake) and respective neuroanatomical as well as functional mechanisms. Tetrapod origin in a marine environment provides additional support for the homology. The single motivation hypothesis is also consistent with ingestive behaviors in nature given similarities (e.g., thirst producing brackish water intake) between the behavior of the laboratory rat and wild animals, rodents included. The hypotheses of single motivation and homology might explain why hyperosmotic rats, or eventually any other hyperosmotic tetrapod, shows paradoxical signs of sodium appetite. They might also explain how ingestive behaviors determined by dehydration and subserved by hindbrain inhibitory mechanisms contributed to tetrapod transition from sea to land.</p></div>","PeriodicalId":20201,"journal":{"name":"Physiology & Behavior","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141640025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of physical inactivity behavior during COVID-19 pandemic on physical fitness, body composition, inflammatory cytokine, and immunocytes in older adults: A retrospective and prospective study COVID-19 大流行期间不运动行为对老年人体能、身体成分、炎症细胞因子和免疫细胞的影响:一项回顾性和前瞻性研究。
IF 2.4 3区 医学
Physiology & Behavior Pub Date : 2024-07-15 DOI: 10.1016/j.physbeh.2024.114640
Sang-Kyun Park , Sihwa Park , Yong-Seok Jee
{"title":"Effects of physical inactivity behavior during COVID-19 pandemic on physical fitness, body composition, inflammatory cytokine, and immunocytes in older adults: A retrospective and prospective study","authors":"Sang-Kyun Park ,&nbsp;Sihwa Park ,&nbsp;Yong-Seok Jee","doi":"10.1016/j.physbeh.2024.114640","DOIUrl":"10.1016/j.physbeh.2024.114640","url":null,"abstract":"<div><p>The prolonged period of COVID-19 has ingrained physical inactivity as a habit, leading to a reluctance to move. This has resulted in a decline in physical fitness and the loss of a healthy body composition. While this trend is particularly noticeable among the older adults, its impact on the immune cell defense system, which is crucial for minimizing viral infections, remains unclear. This study aimed to investigate the physical fitness, body composition, cytokines and immunocytes of older adults who engaged in physical activity (PA) before the COVID-19 pandemic but had to stop it due to the lockdown. A total of 172 older adults aged 61 to 85 years participated in this study: 90 in non-PA group (NPAG, 34 men and 56 women), and 82 in PA group (PAG, 29 men and 53 women). Physical inactivity was 45.13 ± 5.67 weeks in the NPAG and 1.70 ± 0.43 weeks in the PAG. Although there was no significant difference in calorie intake, PA volume showed a significant decrease in NPGA (<em>P</em> &lt; 0.001). VO₂max, strength, and sit-ups decreased in NPAG, whereas they maintained or increased in PAG (<em>Ps</em> &lt; 0.001). NPAG experienced an increase in fat mass (∼33.0 %), along with a decrease in muscle mass (∼10.4 %), but PAG showed slight increases (∼1.1 % vs. ∼1.5 %, <em>Ps</em> &lt; 0.001). Interleukin-6 (∼38.9 %), tumor necrosis factor-α (∼38.3 %), and C-reactive protein (∼33.6 %) increased, whereas immunocytes decreased in NPAG (<em>Ps</em> &lt; 0.001). In contrast, those in PAG showed the opposite phenomenon. This study indicates that even during the COVID-19 situation, maintaining active PA in the older adults helps retain beneficial physical fitness and body composition, reduces inflammatory factors, and contributes to preserving or enhancing the function of immunocytes.</p></div>","PeriodicalId":20201,"journal":{"name":"Physiology & Behavior","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141634298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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