Impact of sleep on the risk of cognitive decline and dementia

Purpose of reviewTrouble falling or staying asleep, poor sleep quality, and short or long sleep duration are gaining attention as potential risk factors for cognitive decline and dementia, including Alzheimer's disease. Sleep-disordered breathing has also been linked to these outcomes. Here, we review recent observational and experimental studies investigating the effect of poor sleep on cognitive outcomes and Alzheimer's disease, and discuss possible mechanisms.Recent findingsObservational studies with self-report and objective sleep measures (e.g. wrist actigraphy, polysomnography) support links between disturbed sleep and cognitive decline. Several recently published studies demonstrate associations between sleep variables and measures of Alzheimer's disease pathology, including cerebrospinal fluid measures of Aβ and PET measures of Aβ deposition. In addition, experimental studies suggest that sleep loss alters cerebrospinal fluid Aβ dynamics, decrements in slow-wave sleep may decrease the clearance of Aβ from the brain, and hypoxemia characteristic of sleep-disordered breathing increases Aβ production.SummaryFindings indicate that poor sleep is a risk factor for cognitive decline and Alzheimer's disease. Although mechanisms underlying these associations are not yet clear, healthy sleep appears to play an important role in maintaining brain health with age, and may play a key role in Alzheimer's disease prevention

The Impact of Anemia on Child Mortality: An Updated Review

Iron deficiency anemia and child mortality are public health problems requiring urgent attention. However, the degree to which iron deficiency anemia contributes to child mortality is unknown. Here, we utilized an exhaustive article search and screening process to identify articles containing both anemia and mortality data for children aged 28 days to 12 years. We then estimated the reduction in risk of mortality associated with a 1-g/dL increase in hemoglobin (Hb). Our meta-analysis of nearly 12,000 children from six African countries revealed a combined odds ratio of 0.76 (0.62–0.93), indicating that for each 1-g/dL increase in Hb, the risk of death falls by 24%. The feasibility of a 1-g/dL increase in Hb has been demonstrated via simple iron supplementation strategies. Our finding suggests that ~1.8 million deaths in children aged 28 days to five years could be avoided each year by increasing Hb in these children by 1 g/dL

How both positive and burdensome caregiver experiences are associated with care recipient cognitive performance: Evidence from the National Health and Aging Trends Study and National Study of Caregiving

IntroductionBeing an informal caregiver to a person with chronic disease, including persons living with dementia (PLWD), is a big role to take on and many caregivers experience both substantial burden and emotional reward related to caregiving. Care recipient factors (e.g., behavioral symptoms) are associated with caregiver experience. However, the relationship between caregiver and care recipient is bidirectional, so it is likely that caregiver factors impact the care recipient, though few studies have investigated this. MethodsIn the 2017 round of the National Health and Aging Trends Study (NHATS) and National Study of Caregiving (NSOC), we studied 1,210 care dyads--170 PLWD dyads and 1,040 without dementia dyads. Care recipients completed immediate and delayed word list memory tasks, the Clock Drawing Test, and a self-rated memory rating, while caregivers were interviewed about their caregiving experiences using a 34-item questionnaire. Using principal component analysis, we created a caregiver experience score with three components-Practical Care Burden, Positive Care Experiences, and Emotional Care Burden. We then investigated the cross-sectional association between caregiver experience components and care recipient cognitive test performance using linear regression models adjusted for age, sex, education, race, and depressive and anxiety symptoms. ResultsAmong PLWD dyads, a higher caregiver Positive Care Experiences score was associated with better care recipient performance on the delayed word recall (B = 0.20, 95% CI 0.05, 0.36) and Clock Draw (B = 0.12, 95% CI 0.01, 0.24) tests while higher Emotional Care Burden score was associated with worse self-rated memory score (B = -0.19, 95% CI -0.39, -0.003). Among participants without dementia, higher Practical Care Burden score was associated with poorer care recipient performance on the immediate (B = -0.07, 95% CI -0.12, -0.01) and delayed (B = -0.10, 95% CI -0.16, -0.05) word recall tests. DiscussionThese findings support the concept that caregiving is bidirectional within the dyad and that positive variables can positively impact both members of the dyad. This suggests that caregiving interventions should target the caregiver and recipient both individually and as a unit, with the goal of holistically improving outcomes for both

Positive Aspects of Caregiving Are Associated With Lower Risk of Frailty and Sleep Disruption in the National Study of Caregiving

Background and objectives: Older adult caregivers have compounded risk for adverse health outcomes; however, evidence investigating the association between caregiving and frailty has been limited. In the National Study of Caregiving (NSOC), we examined the cross-sectional association between caregiving experiences and frailty and sleep disruption. Research design and methods: We included 621 caregivers aged 65 and older from the 2011 NSOC round. They completed a phone interview, including 36 items about caregiving. Using principal component analysis, we identified 3 caregiving components: general burden, positive emotions, and financial-led burden. Frailty was assessed via low energy, shrinking, weakness, reduced activity, and poor self-rated health. Sleep disruption was assessed with 2 questions regarding sleep interruption and trouble falling back asleep. Results: In models adjusted for age, sex, education, depression and anxiety symptoms, and medical conditions, positive emotions were associated with a reduced relative risk of frailty (relative risk [RR] = 0.94, 95% confidence interval [CI] 0.90, 0.99) while general burden (proportional odds ratio [POR] = 1.96, 95% CI 1.30, 2.93) and financial-led burden (POR = 1.94, 95% CI 1.22, 3.06) were associated with sleep interruption. Discussion and implications: Caregiver burden was associated with increased frailty and sleep interruption. Positive emotions were associated with decreased frailty risk. Interventions aimed at reducing the burden and increasing positive emotions in caregivers may improve frailty outcomes

Influences of the COVID-19 Pandemic on Intuitive Exercise and Physical Activity among College Students

The emergence of the COVID-19 pandemic has significantly impacted the health behaviors of people around the world, including their physical activity patterns. Intuitive exercise, a facet of one’s relationship with physical activity, is defined as one’s awareness, mindset (positive versus negative), and mindfulness when engaged in movement. The study’s purpose was to explore whether self-reported physical activity and psychological mindsets around exercise changed during the pandemic. College students (n = 216) described their relationship with exercise before and during the pandemic through anonymous completion of the Intuitive Exercise Scale (IEXS) and open-ended questions to provide in-depth contextualized responses about exercise habits. Participants reported significantly higher scores on intuitive exercise during the pandemic, such as on the Body Trust subscale (M = 3.43), compared to pre-pandemic levels (M = 3.20), p < 0.001. Moreover, varied themes related to physical activity were uncovered such as exercising for fun, exercise influenced by emotion, and loss of motivation to exercise. Important takeaways of the study include the diversity of responses to the pandemic (i.e., some participants reported an increase in physical activity levels and more positive exercise attitudes while others experienced the opposite), the need to promote self-care, and the need for positive coping strategies