"Older, Faster, Stronger": The Multiple Benefits of Masters Sport Participation.

While masters sport aligns with the holistic concept of active aging, related research has focused predominantly on the physical domain, and less is known about the psychological, cognitive, and social benefits of older adults' participation. This study examined, in combination, the perceived psychological, social, cognitive, and physical benefits of training and competing as a masters athlete, while considering age and gender differences. Forty masters athletes residing in Canada were interviewed (21 men and 19 women; 15 who were 50-64 years and 25 who were 65-79 years), representing 15 different sports. Interviews were coded both deductively and inductively, revealing several subthemes of benefits for the broader perceived psychological, social, cognitive, and physical benefits, with few but notable differences between women and men, and those younger than 65 years and those 65+ years. Our findings provide new insights into the positive experiences of active aging associated with high levels of physical activity among older adults, such as greater self-confidence, especially for women, comradery, and feeling mentally sharper, especially for the older age group.

Exploring the relationship between social accountability and competency-based medical education: A narrative review.

BACKGROUND: Social accountability (SA), a quintessential goal of medical education, has been discussed as a precipitant for the transition toward competency-based medical education (CBME). However, the relationship between SA and CBME remains unclear. A narrative review was conducted to systematically explore the relationship between SA and CBME as described in the literature. METHODS: Electronic databases, select journals, and medical education organizations were systematically searched. 363 titles and abstracts were screened and 147 full texts were reviewed. The salient text was extracted from 36 records, which were then inductively coded before narrative synthesis and interpretation. RESULTS: The relationship between SA and CBME was described in three manners: (1) CBME as a natural driver of SA where CBME was perceived to be inherently socially accountable, (2) CBME as an opportunistic mechanism for actively changing medical training to better meet standards of SA, and (3) CBME as a tool to measure SA relating to measurable outcomes data provided by CBME. CONCLUSION: CBME has theoretical potential to assist programs in becoming more socially accountable if the communities they serve are considered key stakeholders in the design, implementation, and evaluation. A paucity of evidence remains which provides empirical evidence of SA within programs that have implemented CBME.

Exposure of the Gulf of St. Lawrence grey seal Halichoerus grypus population to potentially zoonotic infectious agents.

The population of grey seals Halichoerus grypus in Canadian waters is currently used as a commercial source of meat for human consumption. As with domestic livestock, it is important to understand the occurrence in these seals of infectious agents that may be of public health significance and thus ensure appropriate measures are in place to avoid zoonotic transmission. This study examined the prevalence of antibodies against Brucella spp., Erysipelothrix rhusiopathiae, 6 serovars of Leptospira interrogans, and Toxoplasma gondii in 59 grey seals and determined by polymerase chain reaction (PCR) the presence of these potentially zoonotic agents in specific organs and tissues of seropositive animals. The presence of encysted Trichinella spp. larvae was also investigated by digestion of tongue, diaphragm and other muscle samples, but none were detected. Seroprevalence against Brucella spp. and E. rhusiopathiae was low (5 and 3%, respectively). All 59 seals tested had antibodies against L. interrogans, but no carrier of this bacterium was detected by PCR. Seroprevalence against T. gondii was 53%, and DNA of this protozoan was detected by PCR in 11/30 (37%) seropositive animals. Standard sanitary measures mandatory for commercialization of meat products for human consumption should greatly reduce the potential for exposure to these infectious agents. However, special consideration should be given to freezing seal meat for at least 3 d to ensure destruction of tissue cysts of T. gondii.

Anti-doping sciences, abjection and women's sport as a protected category.

In this article we explore the relationships amongst anti-doping sciences, 'abjection,' and the protection of 'women's' sport. We introduce three novel concepts: 'abjection bias,' 'abjection potential,' and 'intersectional abjection,' as tools with the potential to provide greater nuance to understanding the context for these contentious issues in contemporary sport. The debate concerning participation in women's sport-especially elite sport-of people who do not fit within traditional definition of 'women' is increasingly fraught with acrimony with anti-doping sciences often recruited as arbitrator. With access to opportunities such as participation at the Olympic Games at stake, emotions run high in arguments that typically centre on inclusion of transgender and gender diverse (TGD) athletes on the one hand and protection of the women's category on the other. While sport theorists have begun the important work of identifying the roots of these problems deep within the structure of modern sport and society itself, they have hitherto paid little attention to the philosophical underpinnings of that structure. Through the lens of feminist critical analysis, we seek, in this paper, to understand the complex role of 'abjection' in framing the current debate in sport and in related anti-doping sciences. From a clear definition of abjection as a perceived existential threat due to violation of the status quo, we introduce the new concepts of 'abjection bias,' 'abjection potential,' and 'intersectional abjection' in order to understand and explain what in common parlance we might call 'gut reaction.' By looking at the few notable previous treatments of sport abjection and highlighting the historical connections between anti-doping sciences and efforts to protect the women's category, we demonstrate that this co-development is, in part, more easily understood in the context of 'abjection.' We conclude that the clarity gained can also help to shed light on current policy decision-making in relation to the question of protecting the women's sport category.

Alignment Among Patient, Caregiver, and Health Care Provider Perspectives on Hemodialysis Vascular Access Decision-Making: A Qualitative Study.

Background: Updates to the Kidney Disease Outcomes Quality Initiative Clinical Practice Guideline for Vascular Access emphasize the "right access, in the right patient, at the right time, for the right reasons." Although this implies a collaborative approach, little is known about how patients, their caregivers, and health care providers engage in vascular access (VA) decision-making. Objective: To explore how the perspectives of patients receiving hemodialysis, their caregivers, and hemodialysis care team align and diverge in relation to VA selection. Design: Qualitative descriptive study. Setting: Five outpatient hemodialysis centers in Calgary, Alberta. Participants: Our purposive sample included 19 patients receiving maintenance hemodialysis, 2 caregivers, and 21 health care providers (7 hemodialysis nurses, 6 VA nurses, and 8 nephrologists). Methods: We conducted semi-structured interviews with consenting participants. Using an inductive thematic analysis approach, we coded transcripts in duplicate and characterized themes addressing our research objective. Results: While participants across roles shared some perspectives related to VA decision-making, we identified areas where views diverged. Areas of alignment included (1) optimizing patient preparedness-acknowledging decisional readiness and timing, and (2) value placed on trusting relationships with the kidney care team-respecting decisional autonomy with guidance. Perspectives diverged in the following aspects: (1) differing VA priorities and preferences-patients' emphasis on minimizing disruptions to normalcy contrasted with providers' preferences for fistulas and optimizing biomedical parameters of dialysis; (2) influence of personal and peer experience-patients preferred pragmatic, experiential knowledge, whereas providers emphasized informational credibility; and (3) endpoints for VA review-reassessment of VA decisions was prompted by access dissatisfaction for patients and a medical imperative to achieve a functioning access for health care providers. Limitations: Participation was limited to individuals comfortable communicating in English and from urban, in-center hemodialysis units. Few informal caregivers of people receiving hemodialysis and younger patients participated in this study. Conclusions: Although patients, caregivers, and healthcare providers share perspectives on important aspects of VA decisions, conflicting priorities and preferences may impact the decisional outcome. Findings highlight opportunities to bridge knowledge and readiness gaps and integrate shared decision-making in the VA selection process.

Contexte: Les mises à jour des lignes directrices de pratiques cliniques en matière d'accès vasculaire de la KDOQI (Kidney Disease Outcomes Quality Initiative) insistent sur la création « du bon accès, à la bonne personne, au bon moment et pour les bonnes raisons ¼. Ces recommandations sous-entendent une approche collaborative, mais la façon dont les patients, leurs soignants et les prestataires de soins de santé participent à la prise de décision sur l'accès vasculaire (AV) demeure mal connue. Objectif: Explorer les accords et les divergences dans les points de vue des patients sous hémodialyse, leurs soignants et leur équipe de soins relativement à la sélection de l'AV. Conception: Étude qualitative et descriptive. Cadre: Cinq centres d'hémodialyse ambulatoire à Calgary (Alberta). Sujets: Notre échantillon choisi à dessein était composé de 19 patients sous hémodialyse d'entretien, 2 soignants et 21 prestataires de soins de santé (7 infirmières en hémodialyse, 6 infirmières en AV et 8 néphrologues). Méthodologie: Nous avons mené des entrevues semi-structurées auprès des participants consentants. Une approche d'analyse thématique inductive a été employée pour coder les transcriptions en double et caractériser les thèmes répondant à l'objectif de recherche. Résultats: Certains points de vue sur la prise de décision en matière d'AV étaient partagés par tous les participants, mais nous avons identifié quelques domaines de divergence. Les participants s'entendaient sur : 1) l'optimisation de la préparation des patients ­ reconnaître l'état de préparation et le moment de prendre la décision; et 2) la valeur accordée aux relations de confiance avec l'équipe de soins rénaux ­ respecter l'autonomie décisionnelle après conseils. Les points de vue divergeaient sur : 1) les priorités et préférences à l'égard de l'AV ­ l'accent mis par les patients sur la minimisation des perturbations de la vie courante contrastait avec les préférences des prestataires de soins pour les fistules et l'optimisation des paramètres biomédicaux de la dialyse; 2) l'influence de l'expérience personnelle et des pairs ­ les patients préféraient des connaissances pragmatiques et expérientielles, tandis que les prestataires de soins mettaient l'accent sur la crédibilité de l'information; et 3) les critères d'évaluation de l'AV ­ la réévaluation du choix de l'AV est motivée par l'insatisfaction des patients à l'égard de l'accès et, du côté des prestataires de soins, par l'impératif médical de parvenir à un accès fonctionnel. Limites: Seules les personnes fréquentant une unité d'hémodialyse en centre urbain et à l'aise de communiquer en anglais ont pu participer. Les participants comptaient peu de patients plus jeunes et de soignants informels de personnes sous hémodialyse. Conclusion: Bien que les patients, les soignants et les prestataires de soins de santé s'entendent sur certains aspects importants de la décision concernant l'AV, celle-ci pourrait être influencée par des priorités et préférences contradictoires. Nos résultats mettent en évidence des occasions d'intégrer la prise de décision partagée dans le processus de sélection d'un AV et de combler les lacunes dans les connaissances et la préparation des patients.

Human genetic variation: new challenges and opportunities for doping control.

Sport celebrates differences in competitors that lead to the often razor-thin margins between victory and defeat. The source of this variation is the interaction between the environment in which the athletes develop and compete and their genetic make-up. However, a darker side of sports may also be genetically influenced: some anti-doping tests are affected by the athlete's genotype. Genetic variation is an issue that anti-doping authorities must address as more is learned about the interaction between genotype and the responses to prohibited practices. To differentiate between naturally occurring deviations in indirect blood and urine markers from those potentially caused by doping, the "biological-passport" program uses intra-individual variability rather than population values to establish an athlete's expected physiological range. The next step in "personalized" doping control may be the inclusion of genetic data, both for the purposes of documenting an athlete's responses to doping agents and doping-control assays as well facilitating athlete and sample identification. Such applications could benefit "clean" athletes but will come at the expense of risks to privacy. This article reviews the instances where genetics has intersected with doping control, and briefly discusses the potential role, and ethical implications, of genotyping in the struggle to eliminate illicit ergogenic practices.

Clinical evaluation of nasopharyngeal, midturbinate nasal and oropharyngeal swabs for the detection of SARS-CoV-2.

In the setting of supply chain shortages of nasopharyngeal (NP) swabs, we sought to compare the ability of nasopharyngeal, midturbinate nasal, and oropharyngeal swabs (NPS, MTS, and OPS) to detect SARS-CoV-2. Community and hospitalized participants post-COVID-19 diagnosis were swabbed and tested for SARS-CoV-2 by PCR. Thirty-six participants had all 3 swabs collected. Using detection at any site as the standard, the percent positive agreements were 90% (95% CI 74.4-96.5), 80% (70.3-94.7) and 87% (62.7-90.5) for NPS, MTS, and OPS, respectively. Subsequently, 43 participants had OPS and NPS collected. Thirty-nine were positive with a percent positive agreement of 82.1% (95% CI 67.3-91.0) for OPS and 87.2% (73.3-94.4) for NPS. Combining all 79 patients tested, 67 were positive at either site with a positive agreement was 86.5% (76.4-92.7) for OPS and 91.1% (81.8-95.8) for NPS. OPS are an acceptable alternative to NPS for the detection of SARS-CoV-2 infections.

Enzymatic activity of individual bioelectrocatalytic viral nanoparticles: dependence of catalysis on the viral scaffold and its length.

The enzymatic activity of tobacco mosaic virus (TMV) nanorod particles decorated with an integrated electro-catalytic system, comprising the quinoprotein glucose-dehydrogenase (PQQ-GDH) enzyme and ferrocenylated PEG chains as redox mediators, is probed at the individual virion scale by atomic force microscopy-scanning electrochemical atomic force microscopy (AFM-SECM). A marked dependence of the catalytic activity on the particle length is observed. This finding can be explained by electron propagation along the viral backbone, resulting from electron exchange between ferrocene moieties, coupled with enzymatic catalysis. Thus, the use of a simple 1D diffusion/reaction model allows the determination of the kinetic parameters of the virus-supported enzyme. Comparative analysis of the catalytic behavior of the Fc-PEG/PQQ-GDH system assembled on two differing viral scaffolds, TMV (this work) and bacteriophage-fd (previous work), reveals two distinct kinetic effects of scaffolding: An enhancement of catalysis that does not depend on the virus type and a modulation of substrate inhibition that depends on the virus type. AFM-SECM detection of the enzymatic activity of a few tens of PQQ-GDH molecules, decorating a 40 nm-long viral domain, is also demonstrated, a record in terms of the lowest number of enzyme molecules interrogated by an electrochemical imaging technique.

Perceived Time, Frequency, and Intensity of Engagement and Older Masters Athletes' Subjective Experiences.

Masters athletes are a unique group of older adults whose experiences may provide valuable insights into the role of sport for successful aging. The purpose of this study was to explore whether masters athletes' social and psychological experiences vary with their time, frequency, and perceived exertion in training and competition. Semi-structured interviews were conducted with 40 men and women older masters athletes, aged 50-79 years (M = 66), who were active at the competitive level across a variety of sports (e.g., volleyball, curling, rowing, dragon boating, running, swimming, and basketball) at the time of the study. Results indicate that all participants experienced social and psychological benefits from engaging in masters sport. Only the high-frequency engagement subgroup (participating five to seven times per week in training and/or competition) reported social downsides, in terms of missing time with family and friends outside of masters sport. However, some participants described the positive family support (e.g., spouse who endorses sport participation) that overrides some of the social costs. These findings have implications for realizing positive experiences with minimal engagement in masters sport, yet an apparent threshold of participation beyond which negative social consequences may be experienced. This is an important consideration for the design and promotion of sport for older adults.

Acceptable performance of the Abbott ID NOW among symptomatic individuals with confirmed COVID-19.

Introduction. The ID NOW is FDA approved for the detection of SARS-CoV-2 in symptomatic individuals within the first 7 days of symptom onset for COVID-19 if tested within 1 h of specimen collection.Gap statement. Clinical data on the performance of the ID NOW are limited, with many studies varying in their study design and/or having small sample size.Aim. In this study we aimed to determine the clinical performance of the ID NOW compared to conventional RT-PCR testing.Methodology. Adults with COVID-19 in the community or hospital were recruited into the study. Paired throat swabs were collected, with one throat swab transported immediately in an empty sterile tube to the laboratory for ID NOW testing, and the other transported in universal transport media and tested by an in-house SARS-CoV-2 RT-PCR assay targeting the E gene.Results. In total, 133 individuals were included in the study; 129 samples were positive on either the ID NOW and/or RT-PCR. Assuming any positive result on either assay represents a true positive, positive per cent agreement (PPA) of the ID NOW compared to RT-PCR with 95 % confidence intervals was 89.1 % (82.0-94.1%) and 91.6 % (85.1-95.9%), respectively. When analysing individuals with symptom duration ≤7 days and who had the ID NOW performed within 1 h (n=62), ID NOW PPA increased to 98.2 %.Conclusion. Results from the ID NOW were reliable, especially when adhering to the manufacturer's recommendations for testing.

Correction: Novel insights into serodiagnosis and epidemiology of Erysipelothrix rhusiopathiae, a newly recognized pathogen in muskoxen (Ovibos moschatus).

[This corrects the article DOI: 10.1371/journal.pone.0231724.].

Novel insights into serodiagnosis and epidemiology of Erysipelothrix rhusiopathiae, a newly recognized pathogen in muskoxen (Ovibos moschatus).

BACKGROUND: Muskoxen are a key species of Arctic ecosystems and are important for food security and socio-economic well-being of many Indigenous communities in the Arctic and Subarctic. Between 2009 and 2014, the bacterium Erysipelothrix rhusiopathiae was isolated for the first time in this species in association with multiple mortality events in Canada and Alaska, raising questions regarding the spatiotemporal occurrence of the pathogen and its potential impact on muskox populations. MATERIALS AND METHODS: We adapted a commercial porcine E. rhusiopathiae enzyme-linked immunosorbent assay to test 958 blood samples that were collected from muskoxen from seven regions in Alaska and the Canadian Arctic between 1976 and 2017. The cut-off between negative and positive results was established using mixture-distribution analysis, a data-driven approach. Based on 818 samples for which a serological status could be determined and with complete information, we calculated trends in sample seroprevalences in population time-series and compared them with population trends in the investigated regions. RESULTS: Overall, 219/818 (27.8%, 95% Confidence Interval: 24.7-31.0) samples were classified as positive for exposure to E. rhusiopathiae. There were large variations between years and regions. Seropositive animals were found among the earliest serum samples tested; 1976 in Alaska and 1991 in Canada. In Alaskan muskoxen, sample seroprevalence increased after 2000 and, in two regions, peak seroprevalences occurred simultaneously with population declines. In one of these regions, concurrent unusual mortalities were observed and E. rhusiopathiae was isolated from muskox carcasses. In Canada, there was an increase in sample seroprevalence in two muskox populations following known mortality events that had been attributed to E. rhusiopathiae. CONCLUSION: Our results indicate widespread exposure of muskoxen to E. rhusiopathiae in western Canada and Alaska. Although not new to the Arctic, we documented an increased exposure to the pathogen in several regions concurrent with population declines. Understanding causes for the apparent increased occurrence of this pathogen and its association with large scale mortality events for muskoxen is critical to evaluate the implications for wildlife and wildlife-dependent human populations in the Arctic.

Benefits and challenges of a nursing service-learning partnership with a community of internally-displaced persons in Colombia.

Service-learning partnerships between nursing programs and health care settings in vulnerable communities may be challenging to initiate, but can offer multiple benefits for students, faculty, and the community served. The aim of this qualitative descriptive study was to explore the benefits and challenges of establishing a service-learning partnership between a university nursing program and an isolated community of internally-displaced persons in Medellin, Colombia. Semi-structured, in-depth interviews were conducted with 10 nursing professors and nine students who participated in the service-learning partnership. Interviews were audio-recorded, transcribed and analyzed using qualitative content analysis. Main benefits identified were: learning about the social determinants of health, development of compassion, appreciation for the community nursing role, professional growth and development, community engagement and increased access to care for community members. Challenges related to the service-learning experience included feelings of moral distress, lack of value for community nursing, and conflict with traditional biomedical approaches to care. Several threats to program sustainability were also identified. Professors and students offered several recommendations for program improvement, including interdisciplinary collaboration, documentation and dissemination of the service-learning experience, increased community autonomy and capacity for self-care, and curricular changes to enhance recognition of the importance of community nursing.

Building expanded structures from tetrahedral DNA branching elements, RNA and TMV protein.

By combining both chemical and enzymatic ligation with procedures guiding the self-assembly of nanotubular tobacco mosaic virus (TMV)-like particles (TLPs), novel nucleoprotein structures based on DNA-terminated branching elements, RNA scaffolds and TMV coat protein (CP) are made accessible. Tetrahedral tetrakis(hydroxybiphenyl)adamantane cores with four 5'-phosphorylated dinucleotide arms were coupled to DNA linkers by chemical ligation. The resulting three-dimensional (3D) branching elements were enzymatically ligated to the 3' termini of RNA scaffolds either prior to or after the RNAs' incorporation into TLPs. Thus, architectures with interconnected nanotube domains in two different length classes were generated, each containing 70 CP subunits per 10 nm length. Short TMV origin-of-assembly-containing RNA scaffolds ligated to the DNA allowed the growth of protein-coated 34 nm tubes on the terminal RNA strands in situ. Alternatively, 290 nm pre-fabricated tubes with accessible RNA 3' termini, attained by DNA blocking elements hybridized to the RNAs, were ligated with the branched cores. Both approaches resulted in four-armed nanoobjects, demonstrating a so far unique combination of organic synthesis of branching elements, enzymatic modifications, nucleic acid-based scaffolding and RNA-guided and DNA-controlled assembly of tubular RNA-encapsidating protein domains, yielding a novel class of 3D nucleoprotein architectures with polyvalent protein elements. In the long term, the production route might give rise to supramolecular systems with complex functionalities, installed via the orthogonal coupling of effector molecules to TLP domains.

Components of the protein quality control system are expressed in a strain-dependent manner in the mouse hippocampus.

Inbred mouse strains are used in forward-genetic experiments, designed to uncover genes contributing to their highly distinct neurophenotypes and multiple reports of variations in mutant phenotypes due to genetic background differences in reverse-genetic approaches have been published. Information on strain-specific protein expression-phenotypes however, is limited and a comprehensive screen of an effect of strain on brain protein levels has not yet been carried out. Herein a proteomic approach, based upon two-dimensional gel electrophoresis (2-DE) coupled to mass spectrometry (MALDI-TOF/TOF) was used to show significant genetic variation in hippocampal protein levels between five mouse strains. Considering recent evidence for the importance of the intracellular protein quality control system for synaptic plasticity-related mechanism we decided to focus on the analysis of molecular chaperones and components of the ubiquitin-proteasome system. Sixty-six spots, depicting 36 proteins have been unambiguously identified by mass spectrometry. Quantification revealed strain-dependent levels of 18 spots, representing 12 individual gene products. We thus present proteome analysis of hippocampal tissues of several mouse strains as suitable tool to address fundamental questions about genetic control of protein levels and to demonstrate molecular networks of protein metabolism and chaperoning. The findings are useful for designing future studies on these cascades and interpretation of results show that data on brain protein levels cannot be simply extrapolated among different mouse strains.

Dynamic DNA-controlled "stop-and-go" assembly of well-defined protein domains on RNA-scaffolded TMV-like nanotubes.

A DNA-based approach allows external control over the self-assembly process of tobacco mosaic virus (TMV)-like ribonucleoprotein nanotubes: their growth from viral coat protein (CP) subunits on five distinct RNA scaffolds containing the TMV origin of assembly (OAs) could be temporarily blocked by a stopper DNA oligomer hybridized downstream (3') of the OAs. At two upstream (5') sites tested, simple hybridization was not sufficient for stable stalling, which correlates with previous findings on a non-symmetric assembly of TMV. The growth of DNA-arrested particles could be restarted efficiently by displacement of the stopper via its toehold by using a release DNA oligomer, even after storage for twelve days. This novel strategy for growing proteinaceous tubes under tight kinetic and spatial control combines RNA guidance and its site-specific but reversible interruption by DNA blocking elements. As three of the RNA scaffolds contained long heterologous non-TMV sequence portions that included the stopping sites, this method is applicable to all RNAs amenable to TMV CP encapsidation, albeit with variable efficiency most likely depending on the scaffolds' secondary structures. The use of two distinct, selectively addressable CP variants during the serial assembly stages finally enabled an externally configured fabrication of nanotubes with highly defined subdomains. The "stop-and-go" strategy thus might pave the way towards production routines of TMV-like particles with variable aspect ratios from a single RNA scaffold, and of nanotubes with two or even more adjacent protein domains of tightly pre-defined lengths.

Cardiac HCN channels: structure, function, and modulation.

The hyperpolarization-activated cation current (termed I(f), I(h), or I(q)) plays a key role in the initiation and modulation of cardiac and neuronal pacemaker depolarizations. Recently, the hyperpolarization-activated cyclic nucleotide-gated (HCN) family of ion channel subunits has been identified by molecular cloning. When heterologously expressed, each of the four HCN subunits (HCN1-4) generates channels with the principal properties of native I(f), indicating that HCN channels are the molecular correlate of this current. This review describes the molecular and functional diversity of the HCN channel family. The structural determinants of channel activation, modulation, and ion permeation are discussed. The expression pattern of HCN channels in different heart regions is reviewed. Finally, the relationships between biophysical properties of cloned HCN channel types and native cardiac I(f) are explored.