Global existence of classical solutions to the Vlasov-Poisson system in a three dimensional, cosmological setting

The initial value problem for the Vlasov-Poisson system is by now well understood in the case of an isolated system where, by definition, the distribution function of the particles as well as the gravitational potential vanish at spatial infinity. Here we start with homogeneous solutions, which have a spatially constant, non-zero mass density and which describe the mass distribution in a Newtonian model of the universe. These homogeneous states can be constructed explicitly, and we consider deviations from such homogeneous states, which then satisfy a modified version of the Vlasov-Poisson system. We prove global existence and uniqueness of classical solutions to the corresponding initial value problem for initial data which represent spatially periodic deviations from homogeneous states.Comment: 23 pages, Latex, report #

A feasibility study of the physiotherapy management of urinary incontinence in athletic women: trial protocol for the POsITIve study

BackgroundUrinary incontinence (UI) affects up to 40% of adult women within the UK, and pelvic floor muscle training can be effective as a treatment. The prevalence of UI is higher in athletic women than in their sedentary counterparts, but there is little research into reasons for this or into treatment within this population.The aim of this study is to investigate the feasibility of conducting a future randomised controlled trial of physiotherapeutic management of UI in athletic women.MethodsThis is a mixed methods study with three distinct but related phases.Phase 1: Semi-structured interviews with health care professionals in the community will explore current management practices of UI in women and particularly in female athletes in order to inform the control arm of a future study. It will also establish community health care professionals’ understanding of pelvic health physiotherapy.Phase 2: Athletic and regularly exercising women recruited directly from gyms and sports clubs will undergo a course of physiotherapy to manage UI. This will establish study recruitment, eligibility, consent, attendance, attrition, and data completion rates. It will provide information regarding appropriate clinical venues and outcome measures to use for this patient group.Phase 3: Semi-structured interviews with purposefully selected participants from phase 2 will investigate participant satisfaction with recruitment procedures, the intervention, outcome measures and the venues. Further, we will collect data regarding the use of a smartphone ‘app’ for adherence and monitoring of home exercises and participants’ beliefs around randomisation in a future study. We will explore the impact of UI on life and sport in more detail.DiscussionThis study will establish the ease and acceptability of recruiting athletic women directly from gyms and sports clubs and identify attrition rates. It will also explore the acceptability of the intervention, clinical venues and outcome measures. Data collected will be used to inform a future randomised controlled trial.Trial registrationNCT03986411 (clinicaltrials.gov). Registered on 14 June 201

Motive8!: feasibility of a text messaging intervention to promote physical activity in knee osteoarthritis

Aim: To develop and test the feasibility of using a SMS text messaging intervention to promote physical activity in patients with knee OA. Methods: 27 people (6 male, 21 female; aged 25-81 years) with knee osteoarthritis received 4 text messages per week, for 6 weeks. Telephone surveys were conducted at baseline and 6 weeks to measure physical activity levels and beliefs, including self-efficacy for exercise, barriers and benefits of exercise, social support and pain. Participants completed physical activity diaries. Process evaluation included participant perceptions of the intervention and 'real-time' data on intervention fidelity (automated collection of delivery and response data) and participant engagement (text response). Results: 648 messages were sent, 100% were accurately delivered. From baseline to 6 weeks, physical activity, self-efficacy for exercise, perceived benefits of exercise and social support significantly increased; reductions were observed in barriers to exercise and pain. Participants engaged with the intervention; 100% read the messages, 89% responded to texts requesting replies, 64% completed physical activity diaries with low attenuation (1.8% drop) by six weeks. Participants perceived messaging to be enjoyable (96%), personally relevant (85%), of appropriate frequency (100%) and duration (88%). Mobile phones, email and web were perceived to be most acceptable for health promotion compared with other forms of technology. Conclusions: People with knee osteoarthritis can engage meaningfully with an interactive mobile phone messaging intervention over a six-week period. Health communications promoting physical activity demonstrate potential for behaviour change and positive implications for perceptions of exercise and pain; this needs to be tested in a randomised trial. Data collected in 'real-time' can be used for process evaluation to demonstrate participant engagement and intervention fidelity

Ageism is Getting Old!

Ageism is defined as a systemic bias towards older adults because of their are. It is found across the spectrum of health care from a macro policy level down to the individual interactions of healthcare providers towards their patients

Simple advice for a simple ankle sprain? The not so benign ankle injury

Editorial. No abstract available