The Journals of Gerontology Series A Biological Sciences and Medical Sciences (J GERONTOL A-BIOL)

Publisher: Gerontological Society of America, Oxford University Press (OUP)

Journal description

The Journals of Gerontology were the first journals on aging published in the United States. The tradition of excellence in these peer-reviewed scientific journals, established in 1946, continues today. The Journals of Gerontology Series A publishes within its covers the Journal of Gerontology: Biological Sciences and the Journal of Gerontology: Medical Sciences. JOURNAL OF GERONTOLOGY: BIOLOGICAL SCIENCES: Publishes articles on the biological aspects of aging in areas such as biochemistry, biodemography, cellular and molecular biology, comparative and evolutionary biology, endocrinology, exercise sciences, genetics, immunology, morphology, neuroscience, nutrition, pathology, pharmacology, physiology, vertebrate and invertebrate genetics, and biological underpinnings of late life diseases. JOURNAL OF GERONTOLOGY: MEDICAL SCIENCES: Publishes articles representing the full range of medical sciences pertaining to aging. Appropriate areas include, but are not limited to, basic medical science, clinical epidemiology, clinical research, and health services research for professions such as medicine, dentistry, allied health sciences, and nursing. It publishes articles on research pertinent to human biology and disease. The following types of articles are published: 1) articles reporting original research; 2) rapid communications; 3) review articles; 4) guest editorials.

Current impact factor: 5.42

Impact Factor Rankings

2016 Impact Factor Available summer 2017
2014 / 2015 Impact Factor 5.416
2013 Impact Factor 4.984
2012 Impact Factor 4.314
2011 Impact Factor 4.598
2010 Impact Factor 3.988
2009 Impact Factor 3.083
2008 Impact Factor 4.003
2007 Impact Factor 2.932
2006 Impact Factor 2.861
2005 Impact Factor 3.5
2004 Impact Factor 4.122
2003 Impact Factor 4.369
2002 Impact Factor 3.455
2001 Impact Factor 1.898
2000 Impact Factor 1.549
1999 Impact Factor 1.222
1998 Impact Factor 1.127
1997 Impact Factor 1.695
1996 Impact Factor 1.072

Impact factor over time

Impact factor

Additional details

5-year impact 5.41
Cited half-life 8.40
Immediacy index 1.41
Eigenfactor 0.02
Article influence 1.66
Website Journals of Gerontology Series A: Biological and Medical Sciences website
Other titles Journal of gerontology., Biological sciences., Journal of gerontology., Medical sciences., The journals of gerontology. Series A, Biological sciences and medical sciences, Biological sciences and medical sciences
ISSN 1079-5006
OCLC 31425404
Material type Periodical, Internet resource
Document type Journal / Magazine / Newspaper, Internet Resource

Publisher details

Oxford University Press (OUP)

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author cannot archive a post-print version
  • Restrictions
    • 12 months embargo
  • Conditions
    • Pre-print can only be posted prior to acceptance
    • Pre-print must be accompanied by set statement (see link)
    • Pre-print must not be replaced with post-print, instead a link to published version with amended set statement should be made
    • Pre-print on author's personal website, employer website, free public server or pre-prints in subject area
    • Post-print in Institutional repositories or Central repositories
    • Publisher's version/PDF cannot be used
    • Published source must be acknowledged
    • Must link to publisher version
    • Set phrase to accompany archived copy (see policy)
    • Eligible authors may deposit in OpenDepot
    • The publisher will deposit in PubMed Central on behalf of NIH authors
    • Publisher last contacted on 19/02/2015
    • This policy is an exception to the default policies of 'Oxford University Press (OUP)'
  • Classification

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Clostridium difficile infection (CDI) is the most common cause of antibiotic-associated diarrhea and a significant burden on the health care system. Aging has been identified in the literature as a risk factor for CDI as well as adverse outcome from CDI. Although this effect of advanced age on CDI could be partially explained by clinical factors associated with aging, biologic factors are important. Innate immune system, responsible for immediate response to acute infections, plays a major role in CDI pathogenesis. Impairment in function of innate immunity with aging, demonstrated in other infection models, may lead to worse outcome with CDI. C. difficile toxin-specific antibody response protects the host against initial and recurrent infections as shown in observational studies and clinical trial. Effect of aging on antibody response to CDI has not been demonstrated, but the results from vaccine studies in other infections suggest a negative effect on humoral immunity from aging. Although intestinal microbiota from healthy people confers resistance to CDI by preventing C. difficile colonization, changes in composition of microbiota with aging may affect that resistance and increase risk for CDI. There are also age-associated changes in physiology, especially of the gastrointestinal tract, that may play a role in CDI risk and outcomes. In this review, we will first discuss the epidemiology of CDI in the elderly people, then the alteration in innate immunity, humoral response, and microbiota that increases susceptibility to CDI and severe disease and lastly, the physiological and functional changes that may modify outcomes of infection.
    No preview · Article · Jan 2016 · The Journals of Gerontology Series A Biological Sciences and Medical Sciences
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    ABSTRACT: Rapamycin extends mouse life span, but the extent to which rapamycin prevents aging-associated changes in specific tissues remains unclear. Stiffness increases and collagen turnover decreases in mouse tendon with aging; thus, our aim was to determine the effect of long-term rapamycin treatment on the mechanical and structural properties of tendons from old mice. Tendons were harvested from female UM-HET3 mice maintained on a standard chow diet for 4 (adult) or 22 (old) months or fed chow containing polymer-encapsulated rapamycin (eRAPA) from 9 to 22 months of age (old RAPA). Stiffness was twofold higher for tendons of old compared with adult mice, but in old RAPA mice, tendon stiffness was maintained at a value not different from that of adults. Additionally, expression of collagen decreased, expression of matrix metalloproteinase-8 increased, and total hydroxyproline content trended toward decreased levels in tendons of old eRAPA-fed mice compared with controls. Finally, age-associated calcification of Achilles tendons and accompanying elevations in expression of chondrocyte and osteoblast markers were all lower in old eRAPA-fed mice. These results suggest that long-term administration of rapamycin alters the molecular pathways responsible for aging of tendon extracellular matrix, resulting in tissue that is structurally and mechanically similar to tendons in adult mice.
    No preview · Article · Jan 2016 · The Journals of Gerontology Series A Biological Sciences and Medical Sciences

  • No preview · Article · Jan 2016 · The Journals of Gerontology Series A Biological Sciences and Medical Sciences
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background: The Systolic Blood Pressure Intervention Trial (SPRINT) is testing whether a lower systolic blood pressure (BP) target of 120mm Hg leads to a reduction in cardiovascular morbidity and mortality among hypertensive, nondiabetic adults. Because there may be detrimental effects of intensive BP control, particularly in older, frail adults, we sought to characterize frailty within SPRINT to address ongoing questions about the ability of large-scale trials to enroll representative samples of noninstitutionalized, community-dwelling, older adults. Methods: We constructed a 36-item frailty index (FI) in 9,306 SPRINT participants, classifying participants as fit (FI ≤ 0.10), less fit (0.10 < FI ≤ 0.21), or frail (FI > 0.21). Recurrent event models were used to evaluate the association of the FI with the incidence of self-reported falls, injurious falls, and all-cause hospitalizations. Results: The distribution of the FI was comparable with what has been observed in population studies, with 2,570 (27.6%) participants classified as frail. The median FI was 0.18 (interquartile range = 0.14 to 0.24) in participants aged 80 years and older (N = 1,159), similar to the median FI of 0.17 reported for participants in the Hypertension in the Very Elderly Trial. In multivariable analyses, a 1% increase in the FI was associated with increased risk for self-reported falls (hazard ratio [HR] = 1.030), injurious falls (HR = 1.035), and all-cause hospitalizations (HR = 1.038) (all p values < .0001). Conclusions: Large clinical trials assessing treatments to reduce cardiovascular disease risk, such as SPRINT, can enroll heterogeneous populations of older adults, including the frail elderly, comparable with general population cohorts.
    No preview · Article · Jan 2016 · The Journals of Gerontology Series A Biological Sciences and Medical Sciences
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    ABSTRACT: Background: White matter hyperintensities (WMH), a common marker of cerebral small vessel disease, and lower microstructural integrity of normal-appearing white matter are associated with slower gait. How these cerebral measures interact in relation to slower gait is unknown. We assessed whether microstructural integrity of normal-appearing white matter, measured by fractional anisotropy (FA), moderates the association of higher WMH with slower gait. Methods: WMH, FA, and gait speed were acquired for 265 community-dwelling older adults (average age = 82.9 years). Results: The inverse association between WMH and gait was robust to adjustment for age, gender, muscle strength, obesity, stroke, and hypertension (fully adjusted model: βs = -0.19, p = .001). The interaction between WMH and FA was significant; analyses stratified by FA showed that the inverse association between WMH and gait speed was significant only for those with low FA (FA < median, fully adjusted model: βs = -0.28, p = .001). Voxel-based results were similar for participants with FA less than median, there was an inverse association between gait speed and WMH which extended throughout the white matter (genu and body of corpus callosum, anterior limb of internal capsule, corona radiata, and superior longitudinal and fronto-occipital fasciculus). In contrast, for participants with FA ≥ median, the association was limited to the genu of corpus callosum, the cingulum, and the inferior longitudinal fasciculus. Conclusions: Microstructural integrity is a moderating factor in the association between WMH and gait. Future studies should examine whether higher microstructural integrity represents a source of compensation in those with greater WMH burden to maintain function in late life.
    No preview · Article · Jan 2016 · The Journals of Gerontology Series A Biological Sciences and Medical Sciences
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    ABSTRACT: Background: Adverse drug events are a leading cause of hospitalization among older people. Up to half of all medication-related hospitalizations are potentially preventable. The objective of this study was to investigate and compare the association between medication regimen complexity and number of medications with unplanned hospitalizations over a 3-year period. Methods: Data were analyzed for 3,348 participants aged 60 years or older in Sweden. Regimen complexity was assessed using the 65-item Medication Regimen Complexity Index (MRCI) and number of medications was assessed as a continuous variable. Cox proportional hazard models were used to compute unadjusted and adjusted hazard ratios with 95% confidence intervals (CIs) for associations between regimen complexity and number of medications with unplanned hospitalizations over a 3-year period. Receiver operating characteristics curves with corresponding areas under the curve were calculated for regimen complexity and number of medications in relation to unplanned hospitalizations. The population attributable fraction of unplanned hospitalizations was calculated for MRCI and number of medications. Results: In total, 1,125 participants (33.6%) had one or more unplanned hospitalizations. Regimen complexity (hazard ratio 1.22; 95% CI 1.14-1.34) and number of medications (hazard ratio 1.07; 95% CI 1.04-1.09) were both associated with unplanned hospitalizations and had similar sensitivity and specificity (area under the curve 0.641 for regimen complexity and area under the curve 0.644 for number of medications). The population attributable fraction was 14.08% (95% CI 9.62-18.33) for MRCI and 17.61% (95% CI 12.59-22.35) for number of medications. Conclusions: There was no evidence that using a complex tool to assess regimen complexity was better at predicting unplanned hospitalization than number of medications.
    Full-text · Article · Dec 2015 · The Journals of Gerontology Series A Biological Sciences and Medical Sciences
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    ABSTRACT: Toll-like receptor 4 (TLR-4) plays a crucial role in the pathophysiology of several age-related diseases. Although poorer function of circulating myeloid dendritic cells (mDCs) has been reported in the elderly, data on TLR-4 function in these cells in older people are lacking. Here, we investigated TLR-4 functionality in the elderly by ex vivo analysis of cytokine production of mDCs in response to LPS in 39 younger (23–34 years) and 61 older (62–77 years) healthy people using flow cytometry. We matched these subjects for Cytomegalovirus (CMV)-serostatus because a latent infection with this ubiquitous herpesvirus is known to affect numerous immune parameters. We found that TLR-4-dependent production of IL-6 and TNF was strongly stimulated in circulating mDCs from the elderly. However, mDCs of more than half of the young donors failed to respond in the same way. This was related to their already highly activated ex vivo state, predominantly observed in CMV-seropositive young donors and associated with lower CMV-specific IgG titres. This may reflect an increasingly important requirement for control of CMV infection throughout life. These data suggest that TLR-4 agonists may be the adjuvants of choice for elderly people, most of whom are CMV-positive, and whose responses to immunization are frequently impaired.
    No preview · Article · Nov 2015 · The Journals of Gerontology Series A Biological Sciences and Medical Sciences
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    ABSTRACT: Background: We investigated the combined impact of abdominal obesity and low skeletal muscle mass on cardiovascular and total mortality in an elderly Asian population. Methods: A total of 1,485 elderly individuals (≥65 years) from Elderly Nutrition and Health Survey in Taiwan (1999-2000) were enrolled, and their survival status was followed using data from the National Death Registry. Skeletal muscle mass index (SMMI) was calculated by dividing skeletal muscle mass (kg) by height squared (m(2)). Low skeletal muscle mass was defined as the first quartile of SMMI. Abdominal obesity (high triglycerides plus waist circumference [HTGWC]) was defined as triglycerides ≥150mg/dL and waist circumference ≥90cm (men) and ≥80cm (women). The Cox proportional hazard model was used to evaluate the combined impact of abdominal obesity and low SMMI on cardiovascular and total mortality. Results: During follow-up (median 9.2 years), one third (n = 493) of subjects died from any cause, of which 34% (n = 168) were cardiovascular-related. Total and cardiovascular mortality were 4.2 and 1.4 per 100 person-years, respectively. Low SMMI and HTGWC were independently associated with total mortality in men, but only low SMMI was significantly associated in women. Those with both HTGWC and low SMMI had the highest mortality risk, with the cardiovascular mortality risk increased by >6.8-fold and 3.2-fold in men and women, respectively, compared with controls having normal SMMI and TGWC. Conclusions: Elderly individuals with abdominal obesity and low skeletal muscle mass have higher all-cause and cardiovascular mortality risk.
    No preview · Article · Nov 2015 · The Journals of Gerontology Series A Biological Sciences and Medical Sciences
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    ABSTRACT: Background: Albuminuria is associated with cognitive impairment in people with type 2 diabetes mellitus (T2DM). The brain volume correlates of albuminuria in people with T2DM have not been well investigated. Methods: We examined 502 individuals with T2DM (9-12 years duration; mean age ~62 years) who had a brain MRI at baseline and at 40 months. Baseline MRI findings were examined by the presence or absence of albuminuria (≥30mg/g creatinine). Changes in MRI findings were examined by whether albuminuria was persistent, intermittent, or absent during follow-up. Results: At baseline, participants with albuminuria (28.7% of the cohort) had more abnormal white matter volume (AWMV) than participants without albuminuria on unadjusted analysis. This difference was attenuated with adjustment for systolic blood pressure, which was higher in participants with albuminuria than in those without albuminuria. During ~3.5 years of follow-up, participants with persistent albuminuria (15.8%) had a greater increase in new AWMV than participants without albuminuria (59.8%) or those with intermittent albuminuria on unadjusted analysis. This difference was attenuated with adjustment for age and systolic blood pressure. There were no significant differences in gray matter volume and total brain volume between participants with or without albuminuria at baseline or during follow-up. There was no significant effect modification of these findings by estimated glomerular filtration rate (eGFR) at baseline or change in eGFR during follow-up. Conclusions: In this diabetic cohort, baseline albuminuria and persistent albuminuria were not independently associated with any significant differences in brain volume measurements compared with participants without albuminuria.
    No preview · Article · Nov 2015 · The Journals of Gerontology Series A Biological Sciences and Medical Sciences
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    ABSTRACT: Background: Muscle power is a key predictor of physical function in older adults; however, clinically meaningful improvements in leg-extensor muscle power have yet to be identified. The purpose of this study is to establish the minimal clinically important improvement (MCII) and substantial improvement (SI) for leg-extensor power and muscle contraction velocity in mobility-limited older adults. Methods: Data were extracted from three randomized trials of leg-extensor muscle power training interventions (3- to 6-month duration). Measurements of leg-extensor power and velocity were obtained using dynamic bilateral leg press at 40% and 70% of the one-repetition maximum. Anchor-based MCIIs were calculated using selected items extracted from the Late Life Function and Disability Instrument. Standard error of measurement and effect size methods were used to calculate the distribution-based MCII. Results: Data from 164 participants (mean age: 76.6±5.6 years; Short Physical Performance Battery score: 7.8±1.3) were used in this analysis. The respective MCII and SI estimates for 40% leg-extensor power were 18.3 (9%) and 30.5 (15%) W, and 23.1 (10%) and 41.6 (18%) W for 70% leg-extensor power. The respective MCII and SI estimates for 40% average velocity were 0.03(7%) and 0.08(18%) m/s, and 0.02(6%) and 0.05(15%) m/s for 70% average velocity. Conclusions: This is the first study to establish a clinically meaningful improvement of leg-extensor power (9%-10%) and velocity (6%-7%) in mobility-limited older adults. These findings should be used to aid in the design and interpretation of clinical trials and interventions that target improvements in muscle power in this high-risk population.
    No preview · Article · Nov 2015 · The Journals of Gerontology Series A Biological Sciences and Medical Sciences