Aging Clinical Trials

The purpose of the study is to investigate the associations of the age-related changes in the brain, kidneys and cognitive performance in healthy adults by utilizing multiple anatomic and functional MRI methods along with a battery of cognitive tests. Read Less

Brief Summary: Current U.S. Veteran demographics reveal an aging population with significant cardiovascular dysfunction. This ultimately manifests as mobility limitation, inactivity, and a subsequent worsening of cardiovascular disease (CVD) that often leads to death. However, despite this clear negative cycle of events, there is not a single clinically accepted, and therefore routinely utilized, method of assessing vascular health. As nitric oxide (NO) is anti-atherogenic and cardioprotective, identifying an in vivo bioassay of NO bioavailability has significant worth in this arena. Fueled predominantly by the VA Merit Award prior to this renewal application, single passive leg movement (sPLM) and the subsequent blood flow increase, measured non-invasively by ultrasound Doppler in the common femoral artery, is emerging as a method by which vascular endothelial function and therefore NO bioavailability can be determined. However, although this work has yielded an initial characterization of sPLM and established this method to be a novel, valid, and a clinically relevant approach to determine vascular health, further understanding of the sPLM response with advancing age and, ultimately, its implementation and assessment in both rehabilitation and clinical arenas is still necessary. With the growing interest in personalized medicine, the development of tools, such as sPLM, that allow individualized assessments to guide the physician, the patient, and the rehabilitative team, are essential. Therefore, two specific aims are proposed that will address the Central Hypothesis that the sPLM paradigm provides a clinically meaningful assessment of endothelial function. First, cardiac rehabilitation will be assessed by sPLM in the elderly, and, coupled with studies in the young, will elucidate the predominant pathways responsible for the change in endothelial function with aging and rehabilitation. Second, the CVD diagnostic value of the sPLM assessment of endothelial function will be evaluated relative to classic measures and markers of subclinical disease in order accelerate the inclusion of endothelial dysfunction as a CVD risk factor. The proposed studies aim to catalyze the transition of the assessment of endothelial function by sPLM from research to clinical practice. Read Less

This study has two phases: Phase 1 is to examine blood pressure, microvascular function, and sympathetic nerve activity in mid-life adult binge drinkers vs. alcohol abstainers/moderate drinkers. Phase 2 is to examine the effect of 8-week aerobic exercise training on blood pressure, microvascular function, and sympathetic nerve activity in mid-life adult binge drinkers Read Less

High blood pressure (BP) is the major modifiable risk factor for cardiovascular diseases (CVD) and related health conditions, particularly among postmenopausal (PM) women. In adults age ≥50 years this risk is primarily driven by above-normal systolic BP (SBP ≥120 mmHg), as diastolic BP plateaus, then decreases in older adulthood. Although SBP is lower in premenopausal women vs. age-matched men, SBP reaches, then surpasses men after age 60. As such, >75% of PM women in the U.S. have above-normal SBP, which, in turn, is responsible for a 2-fold increase in risk of hypertension and corresponding increases in risk of CVD, chronic kidney disease and many other disorders. A key process linking high SBP to CVD and related conditions is vascular endothelial dysfunction, mediated by excessive reactive oxygen species (ROS)-induced oxidative stress and reductions in nitric oxide (NO) bioavailability. As the number of PM women is rapidly growing, further increases in SBP-related CV disorders are projected without effective intervention. Aerobic exercise (AE) is a first-line, standard-of-care therapy for lowering BP. In PM women with baseline SBP ≥120 mmHg, AE reduces casual (resting) SBP by ~3 mmHg (back to baseline ≤4 weeks post-training), whereas 24-hour SBP is typically unchanged. However, only 25-30% of PM women meet guidelines for 150 min/week of moderate-intensity AE, citing the extensive time requirement, facility access and travel disruptions as major barriers. Another, far less recognized, limitation is that AE training consistently improves endothelial function in midlife/older men, but not in estrogen-deficient PM (PMe-) women, i.e., in >95% of the 60+million PM women in the U.S. Thus, establishing new lifestyle therapies that induce and sustain reductions in SBP and increases in endothelial function in PMe- women with above-normal SBP is an important public health goal. High-resistance inspiratory muscle strength training (IMST) is a time-efficient (5 minutes per session) lifestyle intervention consisting of 30 inspiratory maneuvers performed against a high resistance. Preliminary data suggest 6-weeks of IMST performed 6 days/week reduces SBP by 9 mmHg in adults with above-normal SBP (i.e., greater than 120 mmHg) at baseline. Importantly, this reduction in SBP is equal to or greater than the reduction in blood pressure typically achieved with time- and effort-intensive healthy lifestyle strategies like conventional aerobic exercise. In addition, IMST improved endothelial function in the PMe- women in a small pilot study. To translate these promising preliminary results towards clinical practice, this randomized clinical trial is being conducted to directly compare the efficacy of a longer, clinically relevant treatment duration of IMST (3 months) against home-based, moderate-intensity (standard-of-care) AE in PMe-women. The primary outcome will be the change in casual SBP (IMST vs. AE). Changes in 24-hour SBP and endothelial function will serve as secondary outcomes. Effects on NO bioavailability, ROS/oxidative stress, and the role of "circulating factors" will provide insight into mechanisms of action. The sustained effects on SBP and endothelial function also will be assessed. Accordingly, a randomized, blinded, sham-controlled, parallel group design clinical trial will be conducted to assess the efficacy of 3-months of IMST (75 percent maximal inspiratory pressure) vs. brisk walking (40-60% heart rate reserve; an established healthy lifestyle strategy) for lowering SBP and improving endothelial function in PMe- women age 50 years and older with above-normal SBP. It is hypothesized that IMST will lower SBP and improve endothelial function by decreasing oxidative stress and increasing nitric oxide bioavailability. It is also expect that adherence to the intervention will be excellent (over 80 percent of all training sessions completed at the appropriate intensity). To test this hypothesis, 90 PMe- women age 50 years and older who have SBP >/= 120 mmHg will be recruited. Participants will undergo baseline testing for casual (resting) SBP, 24-hour ambulatory SBP and endothelial function. Innovative mechanistic probes including pharmaco-dissection with vitamin C, analysis of biopsied endothelial cells, and high-throughput metabolomics, will be performed to assess oxidative stress and nitric oxide bioavailability at baseline. After baseline testing, subjects will be randomized to perform either 3-months of high-resistance IMST or brisk walking. Subjects will train 6 days/week. Following 3 months of training, subjects will redo all the tests that were done during baseline testing to assess training-induced changes in SBP, physiological functions, and underlying mechanisms. Subjects will then cease training for 6 weeks before returning to the lab for follow-up testing to determine the persistent effects of IMST. Read Less

Cognitive aging in people with HIV (PWH) is of increasing concern for several reasons: 1) between 52%-59% of PWH experience cognitive impairment known as HIV-Associated Neurocognitive Disorder (HAND) which impacts everyday functioning and quality of life; 2) HAND increases in severity and prevalence with age; and 3) 70% of PWH in the United States will be 50 and older by 2030. Fortunately, cognitive training programs can individually target specific cognitive impairments in PWH and possibly reduce the severity and prevalence of HAND and improve everyday functioning and quality of life. This approach is based around the underlying concept of intra-individual variability as controlled through higher level allocation of cognitive resources, known as executive functioning. This feasibility study will use a two-group pre-post experimental design of adults with HAND including: 1) a 20-hours of Executive Functioning Training group (enroll 60, n=48 with attrition), and 2) a no-contact control (enroll 60, n=48 with attrition). Aim 1 - Feasibility: To determine feasibility and acceptability of the intervention (i.e., attrition, feedback). Exploratory Aim 1 - Cognition: Compare adults who receive Executive Functioning Training to those who receive no training to determine whether they improve in global cognitive ability and overall cognitive IIV. This high impact study is innovative in the following ways: 1) This is the first study aimed to reduce cognitive IIV in PWH. 2) This is the first study to use IIV as a guide to target solely executive functioning training to improve global cognitive ability, which may reduce the severity and prevalence of HAND. 3) Over the last decade, the epicenter of HIV has emerged in the Deep South where this study will occur. Most participants in this study will be older PWH who identify as lower social economic status (SES) and/or African Americans and experience HAND symptoms. Read Less

The menopause transition is associated with increased risk for weight gain and a shift toward storing fat in the belly region, which may increase risk for cardiovascular disease and diabetes. The study will determine whether the stress hormone cortisol contributes to this shift. Read Less

This project explores a novel means of health promotion and prevention of age-related physical frailty, which is designed to overcome barriers to access and promote autonomy in managing physical health. Read Less

In this project, the investigators propose to demonstrate the feasibility of remotely-monitored, caregiver (or spouse)-administered, home-based tDCS intervention to improve mobility in ambulatory older adults with recent falls. This is a three-phase feasibility study in older, ambulatory adult participants at risk of falling due to a loss of balance (participant faller, PF) together with a willing and able participant administrator (PA) that is available during weekdays to administer tDCS (transcranial direct current stimulation) to the PF. Phase 1 is focused on the development and refinement of our training materials for home-based tDCS for PF/PA pairs. The objectives of this phase: Identify areas of confusion and challenges for older adults. Refine our training materials to accompany the home-based tDCS system. In Phase 2, the investigators will complete a pilot trial in 12 PF/PA pairs to assess the feasibility of deploying home-based tDCS in larger clinical trials, and to prepare for the development and implementation of such trials. The objectives of this phase: Determine the mean/range number of visits needed for in-person training. Compliance and retention with the study protocol. Safety/side effects of home-based tDCS, as compared to previously established laboratory-based tDCS data. The investigators hypothesize that adult PAs are able to successfully administer home-based tDCS to PFs. The investigators also expect that PF/PA pairs will exhibit excellent adherence to the intervention and that the prevalence and severity of reported tDCS side-effects will be similar to that observed in previous laboratory-based studies. In Phase 3, the investigators will complete a pilot trial in up to 18 PF/PA pairs; i.e., those who have previously successfully completed either Phase 1 or Phase 2. The study objectives/aims for Phase 3 are: Further explore compliance and retention with the study protocol over a longer time period Identify safety/side effects of home-based tDCS over a longer time-period as compared to previously established laboratory-based tDCS interventions. In Phase 3, the investigators hypothesize that adult PA's who have previously demonstrated the ability to successfully administer tDCS at home, will retain competence and compliance with administration over a longer period, up to 1 year. Read Less

Investigators are adapting the LIFT and REFLECT interventions for older adults living with HIV who have been exposed to childhood sexual abuse. Read Less

The goal of this clinical trial is to examine 3 interventions designed to increase physical activity in older adults with HIV. We will examine 3 potential components of an intervention package: physical activity coaching, cognitive behavioral therapy targeted toward common barriers to physical activity such as low motivation or chronic pain, and a Fitbit-based social support intervention. Our primary outcome will be physical activity, defined as steps per day. Results will guide choice of intervention components to be used in an optimized behavioral intervention. Read Less

This is a pilot clinical trial to test the efficacy of intermittent treatment with the flavonoid compound fisetin for improving vascular endothelial function and reducing aortic stiffness in older adults. This trial will also determine the potential mechanisms by which fisetin may improve vascular function, including by decreasing mitochondrial oxidative stress, cellular senescence and senescence-associated secretory phenotype (SASP) factors in circulation. Lastly, safety, tolerability and adherence of fisetin treatment will be assessed. Read Less

The purpose of this research study is to compare methods to help personalize the prediction of chemotherapy side effects for older adults and to evaluate whether chemotherapy causes changes in the body that are associated with aging. Read Less