Intra-session test-retest reliability of functional connectivity in infants.

Resting functional MRI studies of the infant brain are increasingly becoming an important tool in developmental neuroscience. Whereas the test-retest reliability of functional connectivity (FC) measures derived from resting fMRI data have been characterized in the adult and child brain, similar assessments have not been conducted in infants. In this study, we examined the intra-session test-retest reliability of FC measures from 119 infant brain MRI scans from four neurodevelopmental studies. We investigated edge-level and subject-level reliability within one MRI session (between and within runs) measured by the Intraclass correlation coefficient (ICC). First, using an atlas-based approach, we examined whole-brain connectivity as well as connectivity within two common resting fMRI networks - the default mode network (DMN) and the sensorimotor network (SMN). Second, we examined the influence of run duration, study site, and scanning manufacturer (e.g., Philips and General Electric) on ICCs. Lastly, we tested spatial similarity using the Jaccard Index from networks derived from independent component analysis (ICA). Consistent with resting fMRI studies from adults, our findings indicated poor edge-level reliability (ICC = 0.14-0.18), but moderate-to-good subject-level intra-session reliability for whole-brain, DMN, and SMN connectivity (ICC = 0.40-0.78). We also found significant effects of run duration, site, and scanning manufacturer on reliability estimates. Some ICA-derived networks showed strong spatial reproducibility (e.g., DMN, SMN, and Visual Network), and were labelled based on their spatial similarity to analogous networks measured in adults. These networks were reproducibly found across different study sites. However, other ICA-networks (e.g. Executive Control Network) did not show strong spatial reproducibility, suggesting that the reliability and/or maturational course of functional connectivity may vary by network. In sum, our findings suggest that developmental scientists may be on safe ground examining the functional organization of some major neural networks (e.g. DMN and SMN), but judicious interpretation of functional connectivity is essential to its ongoing success.

Dealing with female sexuality: training, attitude, and practice of obstetrics and gynecology residents from a developing country.

INTRODUCTION: There is little research on how obstetrics and gynecology (Ob/Gyn) residents deal with female sexuality, especially during pregnancy. AIM: The aim of this study was to assess the training, attitude, and practice of Ob/Gyn residents about sexuality. METHODS: A cross-sectional survey of Brazilian Ob/Gyn residents enrolling in an online sexology course was conducted. A questionnaire assessed their training in sexuality during medical school and residency and their attitude and practice on sexual issues during pregnancy. MAIN OUTCOME MEASURES: Training, attitude, and practice of Ob/Gyn residents regarding sexuality were the main outcome measures. RESULTS: A total of 197 residents, from 21 different programs, answered the online questionnaire. Mean age was 27.9 ± 2.2, most were female (87%), single (79%), and had graduated in the last 5 years (91%). Almost two-thirds (63%) stated that they did not receive any training at all and 28% reported having only up to 6 hours of training about sexuality in medical school. Approximately half of the respondents (49%) stated that they had received no formal training about sexuality during their residency up to that moment and 29% had received ≤6 hours of training. Over half (56%) never or rarely took a sexual history, 51% stated that they did not feel competent or confident to answer their pregnant patients' questions about sexuality, and 84% attributed their difficulties in dealing with sexual complaints to their lack of specific knowledge on the topic. CONCLUSION: The vast majority of Brazilian Ob/Gyn residents enrolling in a sexuality course had little previous formal training on this topic in medical school and during their residency programs. Most residents do not take sexual histories of pregnant patients, do not feel confident in answering questions about sexuality in pregnancy, and attribute these difficulties to lack of knowledge. These findings point to a clear need for additional training in sexuality among Brazilian Ob/Gyn residents.

End-of-life use of antibiotics: a survey on how doctors decide.

OBJECTIVES: Infections are the main complications in terminal diseases. Many patients die using antibiotics, which raises questions about their real usefulness and role in unnecessary prolongation of suffering. This survey evaluated how doctors use antibiotics in palliative care. METHODS: From June to August of 2016, an online survey was conducted with 224 doctors who provide palliative care. They had to decide whether to initiate antibiotics in fictitious scenarios involving patients with suspected infections (urinary tract infection, pneumonia, sepsis) in end-of-life (from cancer, dementia, malignant stroke with sequelae, advanced COPD, multiple organ failure). Then, they had to decide whether to stop, maintain, or extend antibiotics after non-response in 72 hours. RESULTS: 88-100% of doctors decided to initiate antibiotics in all situations, except in advanced dementia (45%), and most of them decided to maintain/extend antibiotics inadequately. Factors associated with maintaining/extending antibiotics inadequately were: longer time since graduation (over 13 years; significant in all 7 clinical situations; OR range: 2.45-10.11), and not having formal specialization in palliative care (statistically significant in 3 of 7 situations). CONCLUSIONS: Most palliative care physicians in this study decided to initiate and maintain/extend antibiotics at the end-of-life.

Effects of gradual weight loss on strength levels and body composition in wrestlers athletes.

BACKGROUND: Few investigations have evaluated isokinetic torque after a period of weight loss in wrestlers. Thus, the current study sought to investigate the effects of gradual weight loss in the precompetitive period on isokinetic peak torque in the upper and lower limbs and body composition in wrestling athletes. METHODS: Eight elite athletes participated in the study (mean age 20.8±3.1 years). The athletes visited the laboratory on 2 occasions: during the period of weight maintenance (baseline) and during weight loss, in the precompetitive period (post). The variables analyzed were body composition through air displacement plethysmography (BOD POD) and peak torque (PT) of knee flexion and extension movements, and internal and external shoulder rotation in concentric action, at speeds of 60°/s and 180°/s, determined using an isokinetic dynamometer (Biodex Medical Systems; Shirley, NY, USA). RESULTS: A significant decrease was observed in body composition values, except lean mass. No significant differences were observed in the PT of the movements analyzed: Shoulder internal rotation (60°/s P=0.825; 180°/s P=0.245) and external rotation (60°/s P=0.149; 180°/s P=0.163) and knee extension (60°/s P=0.086; 180°/s P=0.630) and flexion (60°/s P=0.310; 180°/s P=0.239). CONCLUSIONS: Gradual weight loss did not affect the production of torque in the wrestlers before a competition. In addition, gradual weight loss contributed to a reduction in body fat, associated with an increase in percentage lean body mass.

Ghrelin controls hippocampal spine synapse density and memory performance.

The gut hormone and neuropeptide ghrelin affects energy balance and growth hormone release through hypothalamic action that involves synaptic plasticity in the melanocortin system. Ghrelin binding is also present in other brain areas, including the telencephalon, where its function remains elusive. Here we report that circulating ghrelin enters the hippocampus and binds to neurons of the hippocampal formation, where it promotes dendritic spine synapse formation and generation of long-term potentiation. These ghrelin-induced synaptic changes are paralleled by enhanced spatial learning and memory. Targeted disruption of the gene that encodes ghrelin resulted in decreased numbers of spine synapses in the CA1 region and impaired performance of mice in behavioral memory testing, both of which were rapidly reversed by ghrelin administration. Our observations reveal an endogenous function of ghrelin that links metabolic control with higher brain functions and suggest novel therapeutic strategies to enhance learning and memory processes.

Experience of an online course on sexuality during pregnancy for residents.

OBJECTIVE: Many obstetrics and gynecology (Ob/Gyn) residents report insufficient knowledge about female sexuality and this has a negative impact on their capacity to manage their patients. The aim of this study was to describe an online course about sexuality during pregnancy for Brazilian Ob/Gyn residents and evaluate their knowledge acquisition. METHODS: This longitudinal educational intervention study involved 219 Brazilian Ob/Gyn residents. The online course lasted 24h (10 video lectures and discussion chats). Upon enrollment, the participants answered a questionnaire in regard to their training, attitudes and practices about sexuality during pregnancy. Participants' knowledge acquisition was assessed using a pre- and post-course test about sexuality during pregnancy. At the end of the course, participants were asked to evaluate their educational experience. Student's t and chi-square tests were used to analyze the pre- and post-course test scores. P values<0.05 were considered statistically significant. RESULTS: A total of 143 Ob/Gyns (65.3% of those enrolled) completed the course. At baseline, most participants reported that they did not have any sexology classes as undergraduates (62.5%) or in their residency (52.1%), and that they lacked specific knowledge in this area to manage their patients. Mean test scores increased significantly at the end of the course: 4.4 (±1.6) versus 6.0 (±1.3) (out of a maximum score of 10), before and after the course, respectively (p<0.0001). Most of the residents rated the overall quality of the course as "higher than expected". CONCLUSION: An online course for Ob/Gyn residents was associated with a significant increase in knowledge about sexuality during pregnancy.

Validade do questionário internacional de atividade física (IPAQ) em idosos: uma revisão integrativa da literatura

Introdução: O questionário Internacional de Atividade Física (IPAQ) tem sido amplamente utilizado nas pesquisas. É considerado uma boa ferramenta de medição de Atividade Física (AF), no entanto, este questionário não é específico para idosos, geralmente, é aplicado à população em geral. Objetivo: Realizar uma Revisão Integrativa da Literatura apresentando os estudos que investigaram a validade do IPAQ na avaliação de AF em idosos nos últimos seis anos. Métodos: Foi realizada uma Revisão Integrativa da Literatura nas bases de dados PUBMED, BVS e SCOPUS, relativa aos anos de 2014 a 2020, utilizando-se os descritores: Elderly, Aged, IPAQ questionnaire validity, Physical Activity e Exercise. Resultados: Foram selecionados oito artigos cuja metodologia apresenta a validade do IPAQ, na avaliação em idosos com idade ≥65 anos. Seis dos artigos selecionados apresentaram em suas metodologias a avaliação realizada pelo IPAQ-L (versão longa), e apenas dois artigos apresentaram IPAQ-S (versão curta). Conclusão: O IPAQ- L tem sido amplamente utilizado para avaliar os níveis de AF e comportamento sedentário (CS) em idosos. As evidências demonstram que a aplicação do questionário combinado com os dados do acelerômetro, tem mostrado medições satisfatórias, no entanto, futuras versões devem ser estruturadas para atender a este público específico.