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Research in Gerontological Nursing Apr 2009This article focuses on a synthesis of knowledge about healthy aging research in human beings and then synthesized nurse-led research in gerontology and geriatrics that... (Review)
Review
This article focuses on a synthesis of knowledge about healthy aging research in human beings and then synthesized nurse-led research in gerontology and geriatrics that use biomarkers. Healthy aging research has attracted considerable attention in the biomedical and basic sciences within the context of four major areas: (a) genetic variations as an expression of successful or unsuccessful aging; (b) caloric restriction as an intervention to slow the progression of aging; (c) immunological aging; (d) neurobiology of the aging brain. A systematic review of the literature was performed to identify nurse-led geriatric-related biomarker research. Nurse researchers who have chosen to integrate biomarkers as part of their research studies have been working in six focal areas, which are reviewed: health promotion within risk populations, cancer, vascular disease, Alzheimer's disease, caregiving, and complementary therapies. The article provides a discussion of contributions to date, identifying existing gaps and future research opportunities.
Topics: Aged; Aging; Alzheimer Disease; Biomarkers; Brain; Caloric Restriction; Genetic Variation; Geriatric Nursing; Health Promotion; Humans; Neoplasms; Nursing Research; Risk Assessment; Stress, Psychological
PubMed: 20077975
DOI: 10.3928/19404921-20090401-09 -
European Journal of Nutrition Mar 2016Nutrition is a key determinant of chronic disease in later life. A systematic review was conducted of studies examining dietary patterns and quality of life, physical... (Review)
Review
PURPOSE
Nutrition is a key determinant of chronic disease in later life. A systematic review was conducted of studies examining dietary patterns and quality of life, physical function, cognitive function and mental health among older adults.
METHODS
Literature searches in MEDLINE complete, Academic Search Complete, CINAHL Complete, Ageline, Global health, PsycINFO, SCOPUS and EMBASE and hand searching from 1980 up to December 2014 yielded 1236 results. Inclusion criteria included dietary pattern assessment via dietary indices or statistical approaches, a sample of community-dwelling adults aged 45 years and over at baseline and a cross-sectional or longitudinal study design. Exclusion criteria included a single 24-h recall of diet, evaluation of single foods or nutrients, clinical or institutionalised samples and intervention studies. Risk of bias was assessed using the six-item Effective Public Health Practice Project's Quality Assessment Tool for Quantitative Studies.
RESULTS
There were 34 articles (11 cross-sectional and 23 longitudinal) included with 23 studies examining dietary indices and 13 studies using empirical analysis. Most studies examined mental health (n = 10) or cognitive function (n = 18), with fewer studies examining quality of life (n = 6) and physical function (n = 8). Although dietary pattern and outcome assessment methods varied, most studies reported positive associations between a healthier diet and better health outcomes.
CONCLUSION
Overall, the number of studies using dietary patterns to investigate diet and successful ageing is small, and further investigation in longitudinal studies is needed, particularly for quality-of-life outcomes. This review provides support for the importance of a healthy diet for the ageing population globally.
Topics: Aging; Cognition; Diet; Humans; Mental Health; Outcome Assessment, Health Care; Quality of Life
PubMed: 26695408
DOI: 10.1007/s00394-015-1123-7 -
Indian Journal of Public Health 2023'Frailty' has no consensual definition till date, although the term occupies a pivotal role in geriatric medicine. A bibliometric analysis of the literature serves to... (Review)
Review
BACKGROUND
'Frailty' has no consensual definition till date, although the term occupies a pivotal role in geriatric medicine. A bibliometric analysis of the literature serves to capture the keyword cooccurrences and linkages, co-citations, author collaborations, research trends and to present the extant research in a nutshell.
OBJECTIVE
To explore the usage of frailty, its domains in medical research and the evolution of the term to other disciplines through systematic mapping by bibliometric analysis.
METHODS
Literature search was done in the Scopus database using a pre-formed search strategy. 2629 documents were retrieved. Co-occurrence citation analysis using keywords and link strength was obtained using the VOSviewer ver.1.6.16. A three-field plot was constructed using 'biblioshiny' package of the R-studio to identify the various domains of frailty. Descriptive statistics were applied to identify the trends in frailty research, number of contributions from countries, fields of research involving frailty.
RESULTS
Total of 3739 publications were observed, with the USA having most number of contributions (740, 20%) as single country, while India has only 19 contributions (0.5%) in the past 20 years. As a region, Europe and Central Asia contributed to the maximum (1714, 46.4%), most of them being from the high-income countries. Research on frailty has steadily increased over the past two decades, with most of the researches being conducted in the fields of Medicine, Biochemistry and Genetics. Cooccurrence citations and three-field plots indicate the evolving usage of frailty in other domains, such as cognition, mental health, indicators of survival, risk assessment, mortality, and quality of life.
CONCLUSION
Upon exploring frailty, it also makes one wonder if frailty could be the cause for what is known as death due to 'natural causes' or 'old age'. The implementation of extension codes in the ICD-11 related to 'Ageing' (XT9T) and 'Old Age' (MG2A), paves way for researchers to further explore 'frailty' as a cause of mortality.
Topics: Aged; Humans; Aging; Bibliometrics; Biomedical Research; Frailty
PubMed: 37039219
DOI: 10.4103/ijph.ijph_962_22 -
Neuroscience and Biobehavioral Reviews Apr 2017Late-life depression (LLD) is thought to be multifactorial in etiology, including a significant genetic component. While a number of candidate gene studies have been... (Meta-Analysis)
Meta-Analysis Review
Late-life depression (LLD) is thought to be multifactorial in etiology, including a significant genetic component. While a number of candidate gene studies have been carried out, results remain inconclusive. We undertook a systematic review of all genetic association studies of depression or depressive symptoms in late life published before February 2016, and performed meta-analyses on polymorphisms investigated in three or more independent studies. A total of 46 candidate gene studies examining 56 polymorphisms in 23 genes as well as a genome-wide association study (GWAS) were included. Meta-analyses were conducted for four polymorphisms using random effects models, of which three (APOE, BDNF, SLC6A4) were associated with LLD. These genes are implicated in hippocampal plasticity and stress reactivity, suggesting that dysregulation of these pathways may contribute to LLD. Despite using a large sample, the only GWAS published to date identified only one genome-wide significant locus in the 5q21 region. In the future, larger genetic studies specifically examining LLD, including non-hypothesis-driven GWAS, are required to further identify genetic determinants of LLD.
Topics: Aging; Depression; Depressive Disorder; Genome-Wide Association Study; Humans; Polymorphism, Genetic
PubMed: 28137459
DOI: 10.1016/j.neubiorev.2017.01.028 -
Aging & Mental Health 2015Services provided to older people should be developed based on active ageing policies. Nutrition is one aspect of active ageing, but little is known about how food... (Meta-Analysis)
Meta-Analysis Review
OBJECTIVES
Services provided to older people should be developed based on active ageing policies. Nutrition is one aspect of active ageing, but little is known about how food activities contribute to psychological well-being in later life. This is a systematic review of qualitative and quantitative research that answers the question 'What is known about the relationship between food activities and the maintenance of identities in old age?'.
METHODS
We followed the preferred reporting items for systematic reviews and meta-analyses guidelines and used quality assessment parameters to complete a systematic review and narrative synthesis. Academic Search Premier, MEDLINE, CINAHL Plus, and PsycINFO databases were searched.
RESULTS
We initially identified 8016 articles, of which 167 full-text articles were screened for inclusion. Twenty-two articles were included in the review. There was moderate evidence from nine qualitative and two quantitative studies, of variable quality, that food activities contribute to the maintenance of women's gendered identities, the ethnic identities of men and women, and community identities. There was moderate evidence from 10 qualitative studies, of variable quality, that a change in food choice and deteriorating health changed food activity participation. These changes threatened identities. Most studies included both younger adults and older adults.
CONCLUSION
In later life, there are many life experiences leading to change. Further research is needed to develop understanding of how identity and mental well-being are maintained, despite changes in everyday activities like cooking and eating. This may enable health care professionals to meet psychological needs alongside biological needs during nutritional interventions.
Topics: Aged; Aging; Feeding Behavior; Female; Food; Gender Identity; Humans; Male; Social Identification
PubMed: 25373998
DOI: 10.1080/13607863.2014.971707 -
Clinical Interventions in Aging 2018This review presents a critical examination of current knowledge of the impact of combined cognitive and physical training on cognition in healthy elderly subjects. The... (Review)
Review
This review presents a critical examination of current knowledge of the impact of combined cognitive and physical training on cognition in healthy elderly subjects. The objectives are to evaluate the contribution of cognitive and physical training to the enhancement of cognition, and to determine the interest of combining these two training types in one intervention in terms of the benefits for cognition (direct and transfer), long-term maintenance, and transfer to daily living. To do so, a systematic electronic search was conducted in PubMed and Google Scholar. Exclusion criteria were animal and pathological aging studies. We focused on the shared and different behavioral impacts of these two types of training on cognition, as well as their functional and structural impact on the brain. The review indicates that both cognitive and physical training have an impact on cognition and on the brain. However, each type of training seems to preferentially enhance different cognitive functions and specifically impact both brain structure and function. Even though some results argue in favor of a complementarity between cognitive and physical training and the superiority of combined cognitive and physical training, the current state of knowledge does not permit any definitive conclusion. Thus, the present review indicates the need for additional investigations.
Topics: Aged; Aging; Animals; Brain; Cognition; Cognition Disorders; Exercise; Humans; Learning
PubMed: 30057444
DOI: 10.2147/CIA.S165399 -
Experimental Gerontology Jun 2023Ageing is associated with several physiological changes, including changes in the immune system. Age-related changes in the innate and adaptive immune system are thought... (Review)
Review
INTRODUCTION
Ageing is associated with several physiological changes, including changes in the immune system. Age-related changes in the innate and adaptive immune system are thought to contribute to frailty. Understanding the immunological determinants of frailty could help to develop and deliver more effective care to older people. This systematic review aims to study the association between biomarkers of the ageing immune system and frailty.
METHODS
The search strategy was performed in PubMed and Embase, using the keywords "immunosenescence", "inflammation", "inflammaging" and "frailty". We included studies that investigated the association of biomarkers of the ageing immune system and frailty cross-sectionally in older adults, without an active disease that affects immune parameters. Three independent researchers selected the studies and performed data extraction. Study quality was assessed using the Newcastle-Ottawa scale adapted for cross-sectional studies.
RESULTS
A total of 44 studies, with a median number of 184 participants, was included. Study quality was good in 16 (36 %), moderate in 25 (57 %) and poor in 3 (7 %) of studies. The most frequently studied inflammaging biomarkers were IL-6, CRP and TNF-α. Associations with frailty were observed for increased levels of (i) IL-6 in 12 of 24 studies, (ii) CRP in 7 of 19 studies, and (ii) TNF-α in 4 of 13 studies. In none of the other studies were associations observed of frailty with these biomarkers. Different types of T-lymphocyte subpopulations were studied but each subset was studied only once, and the study sample sizes were low.
CONCLUSION
Our review of 44 studies on the relation between immune biomarkers and frailty identified IL-6 and CRP as the biomarkers that were most consistently associated with frailty. T-lymphocyte subpopulations were investigated but too infrequently to draw strong conclusions yet, although initial results are promising. Additional studies are required in order to further validate these immune biomarkers in larger cohorts. Furthermore, prospective studies in more uniform settings and larger cohorts are needed to further investigate the association with immune candidate biomarkers for which potential associations with ageing and frailty were previously observed, before these can be used in clinical practice to help assess frailty and improve the care treatments of older patients.
Topics: Humans; Aged; Prospective Studies; Tumor Necrosis Factor-alpha; Cross-Sectional Studies; Interleukin-6; Aging; Frailty; Biomarkers; Immune System; Frail Elderly
PubMed: 37028607
DOI: 10.1016/j.exger.2023.112163 -
Experimental Gerontology Apr 2018The impact of age and aging in the evolution of systemic parasitic infections remains poorly understood. We conducted a systematic review from preclinical models of...
The impact of age and aging in the evolution of systemic parasitic infections remains poorly understood. We conducted a systematic review from preclinical models of Chagas disease, leishmaniasis, malaria, sleeping sickness and toxoplasmosis. From a structured and comprehensive search in electronic databases, 29 studies were recovered and included in the review. Beyond the characteristics of the experimental models, parasitological and immunological outcomes, we also discussed the quality of current evidence. Our findings indicated that throughout aging, parasitemia and mortality were consistently reduced in Chagas disease and malaria, but were similar or increased in leishmaniasis and highly variable in toxoplasmosis. While a marked humoral response in older animals was related to the anti-T. cruzi protective phenotype, cellular responses mediated by a polarized Th1 phenotype were associated with a more effective defense against Plasmodium infection. Conversely, in leishmaniasis, severe infections and high mortality rates were potentially related to attenuation of humoral response and an imbalance between Th1 and Th2 phenotypes. Due to the heterogeneous parasitological outcomes and limited immunological data, the role of aging on toxoplasmosis evolution remains unclear. From a detailed description of the methodological bias, more controlled researches could avoid the systematic reproduction of inconsistent and poorly reproducible experimental designs.
Topics: Aging; Animals; Bias; Disease Models, Animal; Immunosenescence; Parasitic Diseases
PubMed: 29366738
DOI: 10.1016/j.exger.2018.01.022 -
Health and Quality of Life Outcomes Jan 2016To systematically review and examine the psychometric properties of established resilience scales in older adults, i.e. ≥60 years. (Comparative Study)
Comparative Study Review
OBJECTIVES
To systematically review and examine the psychometric properties of established resilience scales in older adults, i.e. ≥60 years.
METHODS
A systematic review of Scopus and Web of Science databases was undertaken using the search strategy "resilience" AND (ageing OR aging)". Independent title/abstract and fulltext screening were undertaken, identifying original peer-reviewed English articles that conducted psychometric validation studies of resilience metrics in samples aged ≥60 years. Data on the reliability/validity of the included metrics were extracted from primary studies.
RESULTS
Five thousand five hundred nine studies were identified by the database search, 426 used resilience psychometrics, and six psychometric analysis studies were included in the final analysis. These studies conducted analyses of the Connor Davidson Resilience Scale (CD-RISC) and its shortened 10-item version (CD-RISC10), the Resilience Scale (RS) and its shortened 5- (RS-5) and 11- (RS-11) item versions, and the Brief Resilient Coping Scale (BRCS). All scales demonstrated acceptable levels of internal consistency, convergent/discriminant validity and theoretical construct validity. Factor structures for the RS, RS-11 and CD-RISC diverged from the structures in the original studies.
CONCLUSION
The RS, RS-5, RS-11, CD-RISC, CD-RISC10 and BRCS demonstrate psychometric robustness adequate for continued use in older populations. However, results from the current study and pre-existing theoretical construct validity studies most strongly support the use of the RS, with modest and preliminary support for the CD-RISC and BRCS, respectively. Future studies assessing the validity of these metrics in older populations, particularly with respect to factor structure, would further strengthen the case for the use of these scales.
Topics: Adaptation, Psychological; Age Factors; Aged; Aged, 80 and over; Aging; Attitude to Health; Female; Humans; Male; Middle Aged; Psychometrics; Quality of Life; Reproducibility of Results; Resilience, Psychological; Sex Factors; Surveys and Questionnaires
PubMed: 26821587
DOI: 10.1186/s12955-016-0418-6 -
Clinical Epigenetics Apr 2019Ageing is one of the principal risk factors for many chronic diseases. However, there is considerable between-person variation in the rate of ageing and individual... (Meta-Analysis)
Meta-Analysis Review
BACKGROUND
Ageing is one of the principal risk factors for many chronic diseases. However, there is considerable between-person variation in the rate of ageing and individual differences in their susceptibility to disease and death. Epigenetic mechanisms may play a role in human ageing, and DNA methylation age biomarkers may be good predictors of age-related diseases and mortality risk. The aims of this systematic review were to identify and synthesise the evidence for an association between peripherally measured DNA methylation age and longevity, age-related disease, and mortality risk.
METHODS
A systematic search was conducted in line with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Using relevant search terms, MEDLINE, Embase, Cochrane Central Register of Controlled Trials, and PsychINFO databases were searched to identify articles meeting the inclusion criteria. Studies were assessed for bias using Joanna Briggs Institute critical appraisal checklists. Data was extracted from studies measuring age acceleration as a predictor of age-related diseases, mortality or longevity, and the findings for similar outcomes compared. Using Review Manager 5.3 software, two meta-analyses (one per epigenetic clock) were conducted on studies measuring all-cause mortality.
RESULTS
Twenty-three relevant articles were identified, including a total of 41,607 participants. Four studies focused on ageing and longevity, 11 on age-related disease (cancer, cardiovascular disease, and dementia), and 11 on mortality. There was some, although inconsistent, evidence for an association between increased DNA methylation age and risk of disease. Meta-analyses indicated that each 5-year increase in DNA methylation age was associated an 8 to 15% increased risk of mortality.
CONCLUSION
Due to the small number of studies and heterogeneity in study design and outcomes, the association between DNA methylation age and age-related disease and longevity is inconclusive. Increased epigenetic age was associated with mortality risk, but positive publication bias needs to be considered. Further research is needed to determine the extent to which DNA methylation age can be used as a clinical biomarker.
Topics: Aging; DNA Methylation; Epigenesis, Genetic; Genetic Association Studies; Genetic Markers; Genetic Predisposition to Disease; Humans; Mortality
PubMed: 30975202
DOI: 10.1186/s13148-019-0656-7