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Journals of Gerontology. Series A, Biological Sciences and Medical Sciences

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https://www.readbyqxmd.com/read/28444190/biological-aging-and-the-human-gut-microbiota
#1
Vincent J Maffei, Sangkyu Kim, Eugene Blanchard, Meng Luo, S Michal Jazwinski, Christopher M Taylor, David A Welsh
The human gastrointestinal microbiota plays a key homeostatic role in normal functioning of physiologic processes commonly undermined by aging. We used a previously validated 34-item frailty index (FI34) to identify changes in gut microbiota community structure associated with biological age of community-dwelling adults. Stool 16S rRNA cDNA libraries from 85 subjects ranging in age (43-79) and FI34 score (0-0.365) were deep sequenced, denoised, and clustered using DADA2. Subject biological age but not chronological age correlated with a decrease in stool microbial diversity...
April 25, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28444181/allogeneic-human-mesenchymal-stem-cell-infusions-for-aging-frailty
#2
Samuel Golpanian, Darcy L DiFede, Aisha Khan, Ivonne Hernandez Schulman, Ana Marie Landin, Bryon A Tompkins, Alan W Heldman, Roberto Miki, Bradley J Goldstein, Muzammil Mushtaq, Silvina Levis-Dusseau, John J Byrnes, Maureen Lowery, Makoto Natsumeda, Cindy Delgado, Russell Saltzman, Mayra Vidro-Casiano, Marietsy V Pujol, Moisaniel Da Fonseca, Anthony A Oliva, Geoff Green, Courtney Premer, Audrey Medina, Krystalenia Valasaki, Victoria Florea, Erica Anderson, Jill El-Khorazaty, Adam Mendizabal, Pascal J Goldschmidt-Clermont, Joshua M Hare
Background: Impaired endogenous stem cell repair capacity is hypothesized to be a biologic basis of frailty. Therapies that restore regenerative capacity may therefore be beneficial. This Phase 1 study evaluated the safety and potential efficacy of intravenous, allogeneic, human mesenchymal stem cell (allo-hMSC)-based therapy in patients with aging frailty. Methods: In this nonrandomized, dose-escalation study, patients received a single intravenous infusion of allo-hMSCs: 20-million (n = 5), 100-million (n = 5), or 200-million cells (n = 5)...
April 21, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28444135/prevalence-and-correlates-of-olfactory-dysfunction-in-old-age-a-population-based-study
#3
Janina Seubert, Erika J Laukka, Debora Rizzuto, Thomas Hummel, Laura Fratiglioni, Lars Bäckman, Maria Larsson
Background: Olfactory dysfunction (OD) in old age is associated with poor health outcomes. Interrelationships among different correlates of OD can offer insights into the underlying mechanisms, but to date remain understudied. Methods: Odor identification performance and self-reported olfactory functioning were studied in 2,234 people aged 60-90 years, who were free of neurodegenerative disease and enrolled in the Swedish National Study on Aging and Care in Kungsholmen (SNAC-K) study, Stockholm, Sweden...
April 21, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28444130/clinically-relevant-cut-off-points-for-the-diagnosis-of-sarcopenia-in-older-korean-people
#4
Yu-Ri Choe, Ju-Youn Joh, Yeon-Pyo Kim
Background: The optimal criteria applied to older Korean people have not been defined. We aimed to define clinically relevant cut-off points for older Korean people and to compare the predictive validity with other definitions of sarcopenia. Methods: Nine hundred and sixteen older Koreans (≥65 years) were included in this cross-sectional observational study. We used conditional inference tree analysis to determine cut-off points for height-adjusted grip strength (GS) and appendicular skeletal muscle mass (ASM), for use in the diagnosis of sarcopenia...
April 21, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28407041/effects-of-low-muscle-mass-on-albuminuria-and-chronic-kidney-disease-in-patients-with-type-2-diabetes-the-korean-sarcopenic-obesity-study-ksos
#5
Hye Soo Chung, Soon Young Hwang, Ju Hee Choi, Hyun Jung Lee, Hye Jin Yoo, Ji-A Seo, Sin Gon Kim, Nan Hee Kim, Dong Seop Choi, Sei Hyun Baik, Kyung Mook Choi
Background: Previous studies have shown that chronic kidney disease (CKD) is associated with accelerated loss of skeletal muscle in patients on dialysis. However, the relationships of sarcopenia with albuminuria and early-stage CKD in patients with type 2 diabetes have not been examined. Methods: We analyzed diabetic subgroup data from 409 patients with type 2 diabetes from the Korean Sarcopenic Obesity Study (KSOS). Sarcopenia was defined as a skeletal muscle mass index (SMI; SMI [%] = total skeletal muscle mass [kg]/weight [kg] × 100) less than 2 SD below the sex-specific mean for a younger reference group...
April 12, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28407037/what-explains-socioeconomic-differences-in-the-speed-of-heart-rate-recovery-to-postural-challenge
#6
Cathal McCrory, Lisa F Berkman, Patrick V Moore, Rose Anne Kenny
Background: Much recent work has focused on the value of heart rate recovery (HRR) as a marker of cardiovascular health and a predictor of mortality. This article explores socioeconomic variation in HRR following exposure to a potent physiological stressor. Methods: The sample involved a nationally representative cohort of 4,475 community-dwelling older persons aged 50 years and older participating in the Irish Longitudinal Study on Ageing (TILDA). Participants completed an active stand (ie, vertical stand from a supine position) as part of a detailed clinic-based cardiovascular health assessment...
April 12, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28398464/caloric-restriction-and-healthy-life-span-frail-phenotype-of-nonhuman-primates-in-the-wisconsin-national-primate-research-center-caloric-restriction-study
#7
Yosuke Yamada, Joseph W Kemnitz, Richard Weindruch, Rozalyn M Anderson, Dale A Schoeller, Ricki J Colman
Calorie restriction without malnutrition increases longevity and delays the onset of age-associated disorders in multiple species. Recently, greater emphasis has been placed on healthy life span and preventing frailty than on longevity. Here, we show the beneficial effect of long-term calorie restriction on frailty in later life in a nonhuman primate. Frail phenotypes were evaluated using metabolic and physical activity data and defined using the Fried index. Shrinking was defined as unintentional weight loss of greater than 5% of body weight...
April 8, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28379325/change-in-bone-mineral-density-during-weight-loss-with-resistance-versus-aerobic-exercise-training-in-older-adults
#8
Kristen M Beavers, Daniel P Beavers, Sarah B Martin, Anthony P Marsh, Mary F Lyles, Leon Lenchik, Sue A Shapses, Barbara J Nicklas
Background: To examine the effect of exercise modality during weight loss on hip and spine bone mineral density (BMD) in overweight and obese, older adults. Methods: This analysis compared data from two 5-month, randomized controlled trials of caloric restriction (CR; inducing 5-10% weight loss) with either resistance training (RT) or aerobic training (AT) in overweight and obese, older adults. Participants in the RT + CR study underwent 3 days/week of 8 upper/lower body exercises (3 sets, 10 repetitions at 70% 1 RM) and participants in the AT+CR study underwent 4 days/week of treadmill walking (30 min at 65-70% heart rate reserve)...
April 3, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28379407/association-of-family-history-of-exceptional-longevity-with-decline-in-physical-function-in-aging
#9
Emmeline Ayers, Nir Barzilai, Jill P Crandall, Sofiya Milman, Joe Verghese
Background: Although many genetic and nongenetic factors interact to determine an individual's physical phenotype, there has been limited examination of the contribution of family history of exceptional parental longevity on decline in physical function in aging. Methods: The LonGenity study recruited a relatively genetically homogenous cohort of Ashkenazi Jewish adults age 65 and older, who were defined as either offspring of parents with exceptional longevity ([OPEL]: having at least one parent who lived to age 95 or older) or offspring of parents with usual survival ([OPUS]: neither parent survived to age 95)...
April 1, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28369260/financial-exploitation-is-associated-with-structural-and-functional-brain-differences-in-healthy-older-adults
#10
R Nathan Spreng, Benjamin N Cassidy, Bri S Darboh, Elizabeth DuPre, Amber W Lockrow, Roni Setton, Gary R Turner
Background: Age-related brain changes leading to altered socioemotional functioning may increase vulnerability to financial exploitation. If confirmed, this would suggest a novel mechanism leading to heightened financial exploitation risk in older adults. Development of predictive neural markers could facilitate increased vigilance and prevention. In this preliminary study, we sought to identify structural and functional brain differences associated with financial exploitation in older adults...
March 28, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28369286/a-2-year-follow-up-after-a-2-year-rct-with-vitamin-d-and-exercise-effects-on-falls-injurious-falls-and-physical-functioning-among-older-women
#11
Kirsti Uusi-Rasi, Radhika Patil, Saija Karinkanta, Pekka Kannus, Kari Tokola, Christel Lamberg-Allardt, Harri Sievänen
Background: Both exercise and vitamin D are recommended means to prevent falls among older adults, but their combined effects on fall-induced injuries are scarcely studied. Methods: A 2-year follow-up of a previous 2-year randomized controlled trial with vitamin D and exercise (Ex) of 409 older home-dwelling women using a factorial 2 × 2 design (D-Ex-, D+Ex-, D-Ex+, D+Ex+). Besides monthly fall diaries, femoral neck bone mineral density (fn-BMD), and physical functioning were assessed at 1 and 2 years after the intervention...
March 21, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28369209/effects-of-cognition-function-and-behavioral-and-psychological-symptoms-on-medicare-expenditures-and-health-care-utilization-for-persons-with-dementia
#12
Eric Jutkowitz, Robert L Kane, Bryan Dowd, Joseph E Gaugler, Richard F MacLehose, Karen M Kuntz
Background: Clinical features of dementia (cognition, function, and behavioral/psychological symptoms [BPSD]) may differentially affect Medicare expenditures/health care utilization. Methods: We linked cross-sectional data from the Aging, Demographics, and Memory Study to Medicare data to evaluate the association between dementia clinical features among those with dementia and Medicare expenditures/health care utilization (n = 234). Cognition was evaluated using the Mini-Mental State Examination (MMSE)...
March 21, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28369199/the-association-between-extreme-sleep-duration-and-cardiac-autonomic-control-in-community-dwelling-older-adults-the-yilan-study-taiwan
#13
Hsi-Chung Chen, Nai-Wei Hsu, Pesus Chou
Backgrounds: The aims of the present study were to determine the associations and sex-specific relationships between extreme sleep duration and cardiac autonomic control in a cohort of older individuals. Methods: A community-based survey was conducted in Yilan City, Taiwan. Community-dwelling older adults aged ≥65 were randomly selected to participate. Extreme sleep durations were defined as either short sleep (≤5 hours) or long sleep (≥8 hours). Cardiac autonomic control was evaluated using the parameters of frequency-domain analysis of heart rate variability...
March 21, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28329359/larger-lateral-prefrontal-cortex-volume-predicts-better-exercise-adherence-among-older-women-evidence-from-two-exercise-training-studies
#14
John R Best, Bryan K Chiu, Peter A Hall, Teresa Liu-Ambrose
Background: Recent research has suggested an important role of lateral prefrontal cortex (lPFC) in consistent implementation of positive health behaviors and avoidance of negative health behaviors. Methods: We examined whether gray matter volume in the lPFC prospectively predicts exercise class attendance among older women (n = 122) who underwent either a 52-week or 26-week exercise training intervention. Structural magnetic resonance imaging determined gray matter volume at baseline...
March 17, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28329170/life-span-extension-by-axenic-dietary-restriction-is-independent-of-the-mitochondrial-unfolded-protein-response-and-mitohormesis-in-caenorhabditis-elegans
#15
Huaihan Cai, Madina Rasulova, Lieselot Vandemeulebroucke, Lea Meagher, Caroline Vlaeminck, Ineke Dhondt, Bart P Braeckman
In Caenorhabditis elegans, a broad range of dietary restriction regimens extend life span to different degrees by separate or partially overlapping molecular pathways. One of these regimens, axenic dietary restriction, doubles the worm's life span but currently, almost nothing is known about the underlying molecular mechanism. Previous studies suggest that mitochondrial stress responses such as the mitochondrial unfolded protein response (UPRmt) or mitohormesis may play a vital role in axenic dietary restriction-induced longevity...
March 17, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28329397/resveratrol-improves-vascular-function-and-mitochondrial-number-but-not-glucose-metabolism-in-older-adults
#16
Rena M Pollack, Nir Barzilai, Valentin Anghel, Ameya S Kulkarni, Aaron Golden, Pilib O'Broin, David A Sinclair, Michael S Bonkowski, Alexander J Coleville, Danielle Powell, Sharon Kim, Ruin Moaddel, Daniel Stein, Kehao Zhang, Meredith Hawkins, Jill P Crandall
Background: Resveratrol, a plant-derived polyphenol, has been reported to improve glucose metabolism and vascular function and to extend life span in animal models, but studies in humans have been inconclusive. Methods: In a randomized, double-blind crossover study, we treated older glucose-intolerant adults (n = 30) with resveratrol (2-3 g/daily) or placebo, each for 6 weeks. A standard mixed-meal test was used to assess insulin sensitivity (Matsuda index) and secretion (C-peptide deconvolution) and vascular function by reactive hyperemia peripheral arterial tonometry...
March 16, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28329147/a-claims-based-examination-of-health-care-costs-among-spouses-of-patients-with-alzheimer-s-disease
#17
Daniel M Gilden, Joanna M Kubisiak, Kristin Kahle-Wrobleski, Daniel E Ball, Lee Bowman
Background: Spouses of Alzheimer's disease patients (AD spouses) may experience substantial health effects associated with their partner's chronic cognitive and behavioral dysfunction. Studies examining associations between the medical experiences of AD spouses in the period before and after their partner's AD diagnosis are limited, particularly those which measure health care resource use and cost. Methods: AD patients were identified through multiple Medicare claims containing an AD diagnostic code...
March 16, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28329165/four-genome-wide-association-studies-identify-new-extreme-longevity-variants
#18
Paola Sebastiani, Anastasia Gurinovich, Harold Bae, Stacy Andersen, Alberto Malovini, Gil Atzmon, Francesco Villa, Aldi T Kraja, Danny Ben-Avraham, Nir Barzilai, Annibale Puca, Thomas T Perls
The search for the genetic determinants of extreme human longevity has been challenged by the phenotype's rarity and its nonspecific definition by investigators. To address these issues, we established a consortium of four studies of extreme longevity that contributed 2,070 individuals who survived to the oldest one percentile of survival for the 1900 U.S. birth year cohort. We conducted various analyses to discover longevity-associated variants (LAV) and characterized those LAVs that differentiate survival to extreme age at death (eSAVs) from those LAVs that become more frequent in centenarians because of mortality selection (eg, survival to younger years)...
March 15, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28329149/prediction-of-long-term-cognitive-decline-following-postoperative-delirium-in-older-adults
#19
Elizabeth E Devore, Tamara G Fong, Edward R Marcantonio, Eva M Schmitt, Thomas G Travison, Richard N Jones, Sharon K Inouye
Background: Increasing evidence suggests that postoperative delirium may result in long-term cognitive decline among older adults. Risk factors for such cognitive decline are unknown. Methods: We studied 126 older participants without delirium or dementia upon entering the Successful AGing After Elective Surgery (SAGES) study, who developed postoperative delirium and completed repeated cognitive assessments (up to 36 months of follow-up). Pre-surgical factors were assessed preoperatively and divided into nine groupings of related factors ("domains")...
March 15, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28329314/sirt1-polymorphisms-and-serum-induced-sirt1-protein-expression-in-aging-and-frailty-the-champ-study
#20
Shajjia Razi, Victoria C Cogger, Marina Kennerson, Vicky L Benson, Aisling C McMahon, Fiona M Blyth, David J Handelsman, Markus J Seibel, Vasant Hirani, Vasikaran Naganathan, Louise Waite, Rafael de Cabo, Robert G Cumming, David G Le Couteur
The nutrient sensing protein, SIRT1 influences aging and nutritional interventions such as caloric restriction in animals, however, the role of SIRT1 in human aging remains unclear. Here, the role of SIRT1 single-nucleotide polymorphisms (SNPs) and serum-induced SIRT1 protein expression (a novel assay that detects circulating factors that influence SIRT1 expression in vitro) were studied in the Concord Health and Ageing in Men Project (CHAMP), a prospective cohort of community dwelling men aged 70 years and older...
March 14, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
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