Are There Age-Related Differences in the Ability to Learn Configural Responses?

Exercise effects on brain health and learning from minutes to months: The brain EXTEND trial

Despite evidence that aerobic exercise benefits the aging brain, in particular the hippocampus and memory, controlled clinical trials have not comprehensively evaluated effects of aerobic exercise training on human memory in older adults. The central goal of this study was to determine chronic effects of moderate-to-vigorous intensity aerobic exercise on the hippocampus and memory in non-demented, inactive adults ages 55-80 years. We determine effects of aerobic exercise training with a 6-month randomized controlled trial (RCT) comparing 150 min/week of home-based, light intensity exercise with progressive moderate-to-vigorous intensity aerobic exercise. For the first time in a large trial, we examined temporal mechanisms by determining if individual differences in the rapid, immediate effects of moderate intensity exercise on hippocampal-cortical connectivity predict chronic training-related changes over months in connectivity and memory. We examined physiological mechanisms by testing the extent to which chronic training-related changes in cardiorespiratory fitness are a critical factor to memory benefits. The Exercise Effects on Brain Connectivity and Learning from Minutes to Months (Brain-EXTEND) trial is conceptually innovative with advanced measures of hippocampal-dependent learning and memory processes combined with novel capture of the physiological changes, genetic components, and molecular changes induced by aerobic exercise that change hippocampal-cortical connectivity. Given that hippocampal connectivity deteriorates with Alzheimer's and aerobic exercise may contribute to reduced risk of Alzheimer's, our results could lead to an understanding of the physiological mechanisms and moderators by which aerobic exercise reduces risk of this devastating and costly disease.

Transplanting old organs promotes senescence in young recipients

In clinical organ transplantation, donor and recipient ages may differ substantially. Old donor organs accumulate senescent cells that have the capacity to induce senescence in naïve cells. We hypothesized that the engraftment of old organs may induce senescence in younger recipients, promoting age-related pathologies. When performing isogeneic cardiac transplants between age-mismatched C57BL/6 old donor (18 months) mice and young and middle-aged C57BL/6 (3- or 12- month-old) recipients , we observed augmented frequencies of senescent cells in draining lymph nodes, adipose tissue, livers, and hindlimb muscles 30 days after transplantation. These observations went along with compromised physical performance and impaired spatial learning and memory abilities. Systemic levels of the senescence-associated secretory phenotype factors, including mitochondrial DNA (mt-DNA), were elevated in recipients. Of mechanistic relevance, injections of mt-DNA phenocopied effects of age-mismatched organ transplantation on accelerating aging. Single treatment of old donor animals with senolytics prior to transplantation attenuated mt-DNA release and improved physical capacities in young recipients. Collectively, we show that transplanting older organs induces senescence in transplant recipients, resulting in compromised physical and cognitive capacities. Depleting senescent cells with senolytics, in turn, represents a promising approach to improve outcomes of older organs.

I CAN Intervention to Increase Grit and Self-Efficacy: A Pilot Study

In recent years, there has been a growing interest in increasing motivational factors within the domain of psychology. Among these factors, Grit, Mindset, Self-Efficacy, and Well-Being (Flourishing) have been suggested to play an important role in individuals' performance and Well-Being. Thus, cultivating these factors in the general population is important. Previous interventions have displayed substantial effects in certain areas. However, these interventions have primarily been Mindset oriented. This paper presents a novel intervention approach by also emphasizing the importance of brain development; the importance of stimuli for building a network in the brain; the importance of repetition for strengthening the network; and the importance of perseverance and deliberate practice for achievement. The purpose of the current study was to examine the effects of a 35-40 min online intervention to increase the beliefs of 'I CAN' for 38 university students in Norway. The mean age of the 38 participants was 22.55 (SD = 1.59) and they completed a pre-test assessment of the Grit-S Scale, Theories of Intelligence Scale (Mindset), General Self-Efficacy Scale, and Flourishing Scale (Well-Being). This was followed up by the novel intervention and finally a post-test of the scales eight weeks later. The results showed an increase in Grit, Self-Efficacy, and Well-Being. However, only Grit displayed a significant increase. We aimed at creating an intervention where the participants would "turn on the switch", meaning that they develop stronger beliefs. These promising results warrant a further development of the intervention, and studies with a larger group.

Age-related effects on online and offline learning in visuo-spatial working memory

Learning results from online (within-session) and offline (between-sessions) changes. Heterogeneity of age-related effects in learning may be ascribed to aging differentially affecting these two processes. We investigated the contribution of online and offline consolidation in visuo-spatial working memory (vWM). Younger and older participants performed a vWM task on day one and after nine days, allowing us to disentangle online and offline learning effects. To test whether offline consolidation needs continuous practice, two additional groups of younger and older adults performed the same vWM task in between the two assessments. Similarly to other cognitive domains, older adults improved vWM through online (during session one) but not through offline learning. Practice was necessary to improve vWM between sessions in older participants. Younger adults instead exhibited only offline improvement, regardless of practice. The findings suggest that while online learning remains efficient in aging, practice is instead required to support more fragile offline mechanisms.

The aging mind: A complex challenge for research and practice

Cognitive decline as part of mental ageing is typically assessed with standardized tests; below-average performance in such tests is used as an indicator for pathological cognitive aging. In addition, morphological and functional changes in the brain are used as parameters for age-related pathological decline in cognitive abilities. However, there is no simple link between the trajectories of changes in cognition and morphological or functional changes in the brain. Furthermore, below-average test performance does not necessarily mean a significant impairment in everyday activities. It therefore appears crucial to record individual everyday tasks and their cognitive (and other) requirements in functional terms. This would also allow reliable assessment of the ecological validity of existing and insufficient cognitive skills. Understanding and dealing with the phenomena and consequences of mental aging does of course not only depend on cognition. Motivation and emotions as well personal meaning of life and life satisfaction play an equally important role. This means, however, that cognition represents only one, albeit important, aspect of mental aging. Furthermore, creating and development of proper assessment tools for functional cognition is important. In this contribution we would like to discuss some aspects that we consider relevant for a holistic view of the aging mind and promote a strengthening of a multidisciplinary approach with close cooperation between all basic and applied sciences involved in aging research, a quick translation of the research results into practice, and a close cooperation between all disciplines and professions who advise and support older people.

Indonesian Scientists’ Behavior Relative to Research Data Governance in Preventing WMD-Applicable Technology Transfer

Performing research data governance is critical for preventing the transfer of technologies related to weapons of mass destruction (WMD). While research data governance is common in developed countries, it is still often considered less necessary by research organizations in developing countries such as Indonesia. An investigation of research data governance behavior for Indonesian scientists was conducted in this study. The theories of planned behavior (TPB) and protection motivation (PMT) were used to explain the relationships between different factors influencing scientists’ behavior. The theories have been widely used in the information security domain, and the approach was adopted to build the research model of this study. The obtained data were analyzed using partial least-squares structural equation modeling (PLS-SEM) to answer the main research question: “what factors determine the likelihood of practicing research data governance by Indonesian scientists to prevent WMD-applicable technology transfer?” By learning what motivates scientists to adopt research data governance practices, organizations can design relevant strategies that are directed explicitly at stimulating positive responses. The results of this study can also be applied in other developing countries that have similar situations, such as Indonesia.

In-person training on COVID-19 case management and infection prevention and control: Evaluation of healthcare professionals in Bangladesh

Background

As COVID-19 was declared a global pandemic, the major focus of healthcare organizations shifted towards preparing healthcare systems to handle the inevitable COVID-19 burden at different phases and levels. A series of in-person training programs were operated in collaboration with government and partner organizations for the healthcare workers (HCW) of Bangladesh. This study aimed to assess the knowledge of HCWs regarding SARS-CoV-2 infection, their case management, infection prevention and control to fight against the ongoing pandemic.

Methods

As a part of the National Preparedness and Response Plan for COVID-19 in Bangladesh, the training program was conducted at four district-level hospitals and one specialized hospital in Bangladesh from July 1, 2020 to June 30, 2021. A total of 755 HCWs participated in the training sessions. Among them, 357 (47%) were enrolled for the evaluation upon completion of the data, collected from one district hospital (Feni) and one specialized hospital (National Institute of Mental Health).

Results

The mean percentage of pre-test and post-test scores of all the participants were found to be 57% (95% CI 8.34–8.91; p 0.01) and 65% (95% CI 9.56–10.15; p <0.001) respectively. The difference of score (mean) between the groups was significant (p<0.001). After categorizing participants’ knowledge levels as poor, average and fair, doctors’ group has shown to have significant enhancement from level of average to fair compared to that of the nurses. Factors associated with knowledge augmentation of doctors were working in primary health care centers (aOR: 4.22; 95% CI: 1.80, 9.88), job experience less than 5 years (aOR: 4.10; 95% CI: 1.01, 16.63) and experience in caring of family member with COVID-19 morbidity (aOR: 2.06; 95% CI: 1.03, 4.10), after adjusting for relevant covariates such as age, sex and prior COVID-19 illness.

Conclusion

Considering the series of waves of COVID-19 pandemic with newer variants, the present paper underscores the importance of implementing the structured in-person training program on case management, infection prevention and control for the HCWs that may help for successful readiness prior to future pandemics that may further help to minimize the pandemic related fatal consequences.

Assessment of Knowledge Retention in Military Personnel After Training Courses in Sieve Triage Using Different Simulated Scenarios

Introduction

In the course of their pre-deployment training, military students in the United Arab Emirates (UAE) are instructed on sieve triage, which is used on the battlefield. The objective of this study is to test the retention of knowledge immediately after delivery of the triage course, at Day 30 and Day 60 in military personnel with no previous sieve-triage knowledge and with an undifferentiated professional background.

Method

Data were collected using a questionnaire based on a survey toolkit designed by the University of Washington Public Health and distributed randomly amongst military personnel after delivery of sieve triage training. The students were randomly selected in consecutive cohorts over a six-week period.

Results

A total of 456 participants were included in the study. Most of the participants were soldiers (80%); other professions included were officers (9%), nurses (1%), paramedics (1%), and others (9%). The overall mean score for the cohort was 96.81 at Day 0; 87.37 at Day 30; and 76.1 at Day 60. The mean scores depict a decreasing trend for the combined as well as the individual cohorts with the highest mean score at Day 0 and the lowest at Day 60. The mean scores reduced significantly at Day 30 (MD: -9.43; 95% CI: -10.73 to -8.14) and at Day 60 (MD: -20.71; 95% CI: -22.01 to -19.42) compared to Day 0. The mean difference remained significant at Day 30 (MD: -9.42; 95% CI: -10.7 to -8.14) and Day 60 (MD: -20.69; 95% CI: -21.97 to -19.41) compared to Day 0 when adjusted for age and profession.

Conclusion

Knowledge retention from the delivery of sieve triage training among UAE military personnel decreased after 60 days. Therefore, there is a need for regular and periodic refresher courses and training, especially for topics that are not applied regularly.

Normal Aging Affects the Short-Term Temporal Stability of Implicit, But Not Explicit, Motor Learning following Visuomotor Adaptation

Normal aging is associated with a decline in memory and motor learning ability. However, the exact form of these impairments (e.g., the short-term temporal stability and affected learning mechanisms) is largely unknown. Here, we used a sensorimotor adaptation task to examine changes in the temporal stability of two forms of learning (explicit and implicit) because of normal aging. Healthy young subjects (age range, 19–28 years; 20 individuals) and older human subjects (age range, 63–85 years; 19 individuals) made reaching movements in response to altered visual feedback. On each trial, subjects turned a rotation dial to select an explicit aiming direction. Once selected, the display was removed and subjects moved the cursor from the start position to the target. After initial training with the rotational feedback perturbation, subjects completed a series of probe trials at different delay periods to systematically assess the short-term retention of learning. For both groups, the explicit aiming showed no significant decrease over 1.5 min. However, this was not the case for implicit learning; the decay pattern was markedly different between groups. Older subjects showed a linear decrease of the implicit component of adaptation over time, while young subjects showed an exponential decay over the same period (time constant, 25.61 s). Although older subjects adapted at a similar rate, these results suggest natural aging selectively impacts the short-term (seconds to minutes) temporal stability of implicit motor learning mechanisms. This understanding may provide a means to dissociate natural aging memory impairments from deficits caused by brain disorders that progress with aging.

Knowledge, health belief, and associated factors towards the prevention of osteoporosis among post-menopausal women in Metu Town, southwest Ethiopia: A community-based cross-sectional study

INTRODUCTION

Osteoporosis is a condition where bones lose mass and strength. It is a common cause of morbidity and mortality in women, especially those of post-menopausal age. It is estimated that 30% of postmenopausal women globally suffer from osteoporosis. This study aimed to assess knowledge, health beliefs, and associated factors towards the prevention of osteoporosis among post-menopausal women in Metu Town, southwest Ethiopia, 2021.

METHODS

A community-based cross-sectional study was conducted among 422 post-menopause women. A simple random sampling technique was employed to select study participants. Data was collected using a structured interviewer-administered questionnaire. Bivariate and multivariate analyses were condcuted to identify factors significantly associated with the outcome variable.

RESULTS

The results showed that 38.4% and 44.5% of participants had adequate knowledge and positive health beliefs towards the prevention of osteoporosis. Age, marital status, educational status, employment status, and self and family history of osteoporosis were significantly associated with knowledge. Age, educational status, self and family history of osteoporosis, and sources of information were significantly associated with health beliefs.

CONCLUSION

More than 40% of participants had adequate knowledge and positive health beliefs. Being younger, better educated, and having a personal and family history of osteoporosis increased the odds of having adequate knowledge and positive health beliefs. Being employed and getting information from families and friends had a significant association with higher odds of adequate knowledge and positive health beliefs.

Striking a chord with healthy aging: memory system cooperation is related to preserved configural response learning in older adults

Evidence from tasks that primarily tap either hippocampal- or striatal-based memory systems suggests that although these systems often compete for control of behavior, aging is associated with greater cooperation between them. This may stem from altered prefrontal cortex function. Here, we use a configural response task designed to engage both memory systems to test how age affects their interaction with cortical regions including the prefrontal cortex. We found that although older and younger adults learned just as well, older adults showed greater initial activation in cortical networks associated with visuospatial-action mapping and resolving conflict for competing memory representations. Older adults also showed greater functional coupling of the striatum with the left inferior frontal gyrus, in parallel with similar hippocampal coupling to ventral visual regions as young adults. Overall, our results support the proposal that aging is associated with more cooperative memory systems, but we did not find that greater cooperation is associated with less interaction between the prefrontal cortex and core memory system structures during learning.

Nonlinear mixed-effects model reveals a distinction between learning and performance in intensive reach training post-stroke

BACKGROUND

We recently showed that individuals with chronic stroke who completed two sessions of intensive unassisted arm reach training exhibited improvements in movement times up to one month post-training. Here, we study whether changes in movement times during training can predict long-term changes.

METHODS

Sixteen participants with chronic stroke and ten non-disabled age-matched participants performed two sessions of reach training with 600 movements per session. Movement time data during training were fitted to a nonlinear mixed-effects model consisting of a decreasing exponential term to model improvements of performance due to learning and an increasing linear term to model worsening of performance due to activity-dependent fatigability and/or other factors unrelated to learning.

RESULTS

For non-disabled age-matched participants, movement times gradually decreased overall during training and overall changes in movement times during training predicted long-term changes. In contrast, for participants post-stroke, movement times often worsened near the end of training. As a result, overall changes in movement times during training did not predict long-term changes in movement times in the stroke group. However, improvements in movement times due to training, as estimated by the exponential term of the model, predicted long-term changes in movement times.

CONCLUSION

Participants post-stroke showed a distinction between learning and performance in unassisted intensive arm reach training. Despite worsening of performance in later trials, extended training was beneficial for long-term gains.