Aging
Conditions
Keywords
stable isotopes, disease, metabolism
Brief summary
Considerable heterogeneity in the aging population has been observed. The exceptional longevity of individuals reaching 100 years old, so-called centenarians may be an example of life-long healthy aging, or added years may be spent in poor health with decreased physical and cognitive functioning. Current knowledge of the aging experience and the trajectories of physical and cognitive decline across various age groups are not well-understood, yet crucial to prevent spending added years in disease. Hence, the study objective is to develop the metabolic profile associated with aging-related disorders measured as the incidence of impaired functional capacity, cognitive function, and/or well-being.
Detailed description
Our lab developed a pulse method combining multiple stable tracers to study multiple metabolic pathways in the same individual simultaneously. By measuring whole-body metabolism in a large group of older adults, we may be able to unravel age-related deterioration in protein turnover (synthesis and breakdown) that contributes to impaired functional capacity. Metabolic profiles could explain differences in pathways in the aging process with a special interest in the metabolism of amino acids as they have been associated with aging-related disorders. Studies on the effect of aging on metabolism might serve as potential therapeutic targets.
Interventions
OTHERStable tracer infusion in a postabsorptive state
Multiple stable-labeled tracers of amino acids, ketoacids, glycerol, short-chain fatty acids
Sponsors
Texas A&M University
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
50 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Stable body-weight (± 5%) for the past 3 months * Subject is judged to be in satisfactory health based on medical history, physical examination, and laboratory screening evaluations. * Ability to walk, sit down and stand up independently or with walking mobility aids * Ability to lie in a supine or elevated position for up to 3 hours * Willingness and ability to comply with the protocol
Exclusion criteria
* Insulin dependent diabetes mellitus * Established diagnosis of malignancy * History of untreated metabolic diseases including hepatic or renal disorder * Presence of acute illness or metabolically unstable chronic illness * Presence of fever within the last 3 days * Use of short course of oral corticosteroids within 4 weeks preceding study day * Failure to give informed consent or Investigator's uncertainty about the willingness or ability of the subject to comply with the protocol requirements * (Possible) pregnancy * Already enrolled in another clinical trial and that clinical trial interferes with participating in this study
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Age-related changes in whole-body protein and amino acid metabolism | 2 hours | Whole-body production rate measured after stable tracer administration |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Age-related changes in whole-body glucose metabolism | 2 hours | Whole-body production rate measured after stable tracer administration |
| Age-related changes in whole-body fat metabolism | 2 hours | Whole-body production rate measured after stable tracer administration |
| Age-related changes in depression as measured by the Hospital Anxiety and Depression Scale (HADS) and Geriatric Depression Scale (if applicable) | baseline visit | Self-reported depression measured by a validated questionnaire related to depression. Each item on the questionnaire is scored from 0-3 and this means that a person can score between 0 (no symptoms) and 21 (severe symptoms). A higher score indicates a worse outcome (greater self-reported depression symptoms). |
| Age-related changes in anxiety as measured by the Hospital Anxiety and Depression Scale (HADS) | baseline visit | Anxiety measured by a validated questionnaire related to anxiety-related symptoms. Each item on the questionnaire is scored from 0-3 and this means that a person can score between 0 (no symptoms) and 21 (severe symptoms) related to anxiety. A higher score indicates a worse outcome (greater self-reported anxiety symptoms). |
| Age-related changes in mood as measured by the Profile of Mood State (POMS) | baseline visit | A psychological distress scale to measure the mood disturbance in 6 domains - fatigue-inertia, vigor-activity, tension-anxiety, depression-dejection, anger-hostility, and confusion-bewilderment in the past week. Each item on the questionnaire is awarded a score from 0 (not at all) to 4 (extremely), except Relaxed and Efficient scored 4 (not at all) and 0 (extremely), based on the intensity of the assessed feeling in the past week. |
| Age-related changes in health status | baseline visit | Health status assessed by Health-Related Quality of Life Scale (HR-QoL) |
| Age-related changes in physical activity | baseline visit | Physical activity assessed by Physical Activity Scale for the Elderly (PASE) |
| Age-related changes in sleep quality | baseline visit | Sleep quality assessed by Pittsburgh Sleep Quality Index |
| Age-related changes in nutritional status | baseline visit | Nutritional status assessed by Mini-Nutritional Assessment |
| Age-related changes in overall cognitive abilities as measured by Montreal Cognitive Assessment (MoCA) | baseline visit | MoCa assesses several cognitive domains and is used for the screening of mild cognitive impairment. Total scores range from 0-30 with lower scores indicating decreased functioning. |
| Age-related changes in exercise capacity | baseline visit | Functional exercise capacity assessed by 6-minute walk test |
| Age-related changes in physical weakness (frailty) | baseline visit | Physical weakness assessed by Short Physical Performance Battery |
| Age-related changes in skeletal muscle strength of the upper extremity | baseline visit | Skeletal muscle strength measured by handgrip test |
| Age-related changes in skeletal muscle strength of the lower extremity | baseline visit | Skeletal muscle strength measured by one-leg test |
| Age-related changes in respiratory muscle strength | baseline visit | Respiratory muscle strength measured by a hand-held mouth pressure device (Micro RPM) |
| Age-related changes in balance | baseline visit | Skeletal muscle strength measured by Berg Balance Scale and balance platform |
| Age-related changes in gut microbiota | baseline visit | The amount and types of microbiota assessed in collected stool sample |
| Age-related changes in gut function | baseline visit | Gut function assessed by Gastrointestinal Symptom Rating Scale, a 15-item instrument designed to assess the symptoms associated with common gastrointestinal disorders. A higher score indicates worse outcomes (more discomfort). |
| Age-related changes in attention and executive functions as measured by Trail Making Test (TMT) | baseline visit | In Part A, the examinee is instructed to connect a set of 25 circles with numbers as quickly as possible while maintaining accuracy. In Part B, the examinee is instructed to connect a set of 25 circles, alternating between numbers and letters, as quickly as possible while maintaining accuracy. Measures attentional resources and is a measure of the frontal lobe executive functions of visual search, set-switching and mental flexibility. The total time in seconds was reported for each measure. |
Other
| Measure | Time frame | Description |
|---|---|---|
| Age-related changes in hand dexterity | baseline visit | Hand dexterity assessed by the Nine-Hole Peg Test (9-HPT), a standardized, quantitative assessment in which the subject is asked to take pegs from a container, one by one, and place them into the holes on the board. Time upon completion will be recorded using both left and right hand, separately. |
Countries
United States
Contacts
Primary ContactLaura Ruebush, PhD
Backup ContactMarielle Engelen, PhD
Outcome results
None listed