Publications by authors named "Helen MacDonald"

Assistive Technology for Cognition (ATC) can help people to compensate for cognitive impairments following Acquired Brain Injury (ABI). Examples include mainstream devices such as smartphones, watches and environmental controls, and bespoke devices such as medication devices or specific educational software. Evidence suggests that professional support is key to people successfully adopting ATC, yet low confidence amongst clinicians and perceptions about barriers are often cited as reasons for not recommending ATC in practice.

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College students are experiencing pronounced mental health difficulties as a result of the COVID-19 pandemic. Little is known, however, about underlying risk and resilience factors contributing to students' psychological health during this time. The current study examined mindfulness, resilience, coping, emotion regulation, and daily hassles as possible predictors of COVID-19 concern, psychological distress, and PTSD symptoms in a sample of college students.

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Warzone deployment increases risk for posttraumatic stress disorder symptoms (PTSS), including among service members who have children. Parental PTSS are associated with child depression, anxiety, hyperactivity, and conduct problems, yet few studies of child behavioral health outcomes in military populations have accounted for PTSS in both warzone veterans and their partners. Fewer still incorporate non-clinically-recruited samples of nationally dispersed warzone veterans and their families.

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Background: Living practice guidelines are increasingly being used to ensure that recommendations are responsive to rapidly emerging evidence.

Objective: To develop a framework that characterizes the processes of development of living practice guidelines in health care.

Design: First, 3 background reviews were conducted: a scoping review of methods papers, a review of handbooks of guideline-producing organizations, and an analytic review of selected living practice guidelines.

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The COVID-19 pandemic's effects on college student mental health and its underlying mechanisms are not fully understood. Although necessary, physical distancing abruptly restricts interaction with environmental rewards and disrupts sleep patterns, both of which may contribute to psychological symptoms (eg, depression and anhedonia). This study explored differences in psychological symptoms, reward exposure and responsiveness, and sleep before versus during the pandemic.

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Recent models propose reward system dysfunction as a key mediator of the relationship between sleep and depression and anhedonia. This study explored interrelationships among sleep disturbance, depressive symptoms, anhedonia, and reward responsiveness. Two-hundred and sixty undergraduate students completed questionnaires and a daily diary paradigm assessing sleep, reward responsiveness, depression, anhedonia, and positive affect over 1 week.

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Background: Seasonal variations have been reported for immune markers. However, the relative contributions of sunlight and vitamin D variability on such seasonal changes are unknown.

Objective: This double-blind, randomized, placebo-controlled trial tested whether daily 400 IU vitamin D supplementation affected short-term (12 weeks) and long-term (43 weeks) natural regulatory T cell (nTreg) populations in healthy participants.

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Intra-annual variability in the East Auckland Current (EAuC) was studied using a year-long timeseries of in situ and remotely-sensed velocity, temperature and salinity observations. Satellite-derived velocities correlated well ([Formula: see text]) with in situ observations and well-represent the long-term ([Formula: see text] days) variability of the upper ocean circulation. Four mesoscale eddies were observed during the year (for 260 days) which generated distinct flows between the continental slope and rise.

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'Blinding' involves concealing knowledge of which trial participants received the interventions from participants themselves and other trial personnel throughout the trial. Blinding reduces bias arising from the beliefs and expectations of these groups. It is agreed that where possible, blinding should be attempted, for example by ensuring that experimental and control treatments look the same.

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Clinical Question: What is the role of drugs in preventing covid-19? WHY DOES THIS MATTER?: There is widespread interest in whether drug interventions can be used for the prevention of covid-19, but there is uncertainty about which drugs, if any, are effective. The first version of this living guideline focuses on the evidence for hydroxychloroquine. Subsequent updates will cover other drugs being investigated for their role in the prevention of covid-19.

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The distribution of benthic ecosystems, dominated by filter-feeding communities, is highly influenced by the seabed geomorphology. However, the spatial variation in settlement of these species is also affected by near-bottom currents and any changes in light, nutrient concentration and food quality often associated with increases of suspended sediment concentrations within the water column. Detailed predictions of the geographic distribution of filter-feeder species and a deeper understanding of the physical processes influencing their distribution patterns is key for effective management and conservation.

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Background: Placebo or sham controls are the standard against which the benefits and harms of many active interventions are measured. Whilst the components and the method of their delivery have been shown to affect study outcomes, placebo and sham controls are rarely reported and often not matched to those of the active comparator. This can influence how beneficial or harmful the active intervention appears to be.

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Updates: This is the fourteenth version (thirteenth update) of the living guideline, replacing earlier versions (available as data supplements). New recommendations will be published as updates to this guideline.

Clinical Question: What is the role of drugs in the treatment of patients with covid-19?

Context: The evidence base for therapeutics for covid-19 is evolving with numerous randomised controlled trials (RCTs) recently completed and underway.

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