Icelandic Heart Association Research Institute

Kópavogur, Iceland

Icelandic Heart Association Research Institute

Kópavogur, Iceland
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Siggeirsdottir K.,Icelandic Heart Association Research Institute | Aspelund T.,Icelandic Heart Association Research Institute | Aspelund T.,University of Iceland | Jonsson B.Y.,Skåne University Hospital | And 7 more authors.
Osteoporosis International | Year: 2014

The incidence of the most common fracture types in Iceland is reported based on individual data from the Reykjavik Study 1967-2008. Time trend is reported for the major osteoporotic fractures (MOS) 1989-2008. Introduction: This study aims to assess the incidence of all fractures in Iceland, with emphasis on the rate of hip fractures, and compare the incidence with other populations as well as examine the secular changes. Methods: Individuals from the prospective population-based cohort Reykjavik Study were examined between 1967 and 2008 (follow-up 26.5 years), which consisted of 9,116 men and 9,756 women born in 1907-1935, with age range 31-81 years. First fracture incidence was estimated using life table methods with age as the timescale. Results: Fracture rate increased proportionally with age between the sexes for vertebral and proximal humerus but disproportionally for hip and distal forearm fractures. The ratio of first fracture incidence between the sexes varied considerably by site: 2.65 for hip fractures and the highest for distal forearm fractures at 4.83. By the age of 75, 36.7 % of women and 21 % of men had sustained a fracture, taking into account competing risk of death. The incidence of hip fractures was similar to results previously published from USA, Sweden, Norway, and Scotland. The incidence of MOS fractures in both sexes decreased over the last decade, except hip fractures in men, which remained unchanged, as reflected in the women/men ratio for the hip, which changed from 2.6 to 1.7. Conclusion: This study adds information to scarce knowledge on the relative fracture incidence of different fractures. The incidence of MOS fractures increased in the latter part of the last century in both sexes and declined during the last decade, less dramatically for men. This information is important for planning health resources. © 2013 International Osteoporosis Foundation and National Osteoporosis Foundation.

Danielsen R.,Reykjavik University | Aspelund T.,Icelandic Heart Association Research Institute | Aspelund T.,University of Iceland | Harris T.B.,U.S. National Institute on Aging | And 2 more authors.
International Journal of Cardiology | Year: 2014

Methods and results Echocardiography and computed tomography (CT) data from individuals who participated in the AGES-Reykjavik study were used. Echocardiography data from 685 individuals (58% females) aged 67-95 years were available. In both sexes combined, the prevalence for severe AS, defined as an aortic valve area index of < 0.6 cm2/m2, in the age groups < 70, 70-79 and ≤80 years was 0.92%, 2.4% and 7.3%, respectively. A ROC analysis on the relation between the echocardiography data and the aortic valve calcium score on CT defined a score ≤500 to be indicative of severe AS. Subsequently, in a CT study cohort of 5256 individuals the prevalence of severe AS in the same age groups was 0.80%, 4.0% and 9.5%, respectively. Overall, the prevalence of severe AS by echocardiography and CT in individuals ≤70 years was 4.3% and 5.9%, respectively. A prediction on the number of elderly ≤70 years for the coming decades demonstrated that patients with severe AS will have increased 2.4 fold by the year 2040 and will more than triple by the year 2060. Conclusion This study, in a cohort of elderly individuals representative of the general population in a Nordic country, predicts that AS will be a large health problem in the coming decades.Aims To evaluate the prevalence of significant aortic valve stenosis (AS) in a randomly selected study population of elderly individuals representing the general population of Iceland. Furthermore, to predict the number of individuals likely to have severe AS in the future. © 2014 Elsevier Ireland Ltd. All rights reserved.

Kopperdahl D.L.,O.N. Diagnostics | Aspelund T.,Icelandic Heart Association Research Institute | Aspelund T.,University of Iceland | Hoffmann P.F.,O.N. Diagnostics | And 7 more authors.
Journal of Bone and Mineral Research | Year: 2014

Finite element analysis of computed tomography (CT) scans provides noninvasive estimates of bone strength at the spine and hip. To further validate such estimates clinically, we performed a 5-year case-control study of 1110 women and men over age 65 years from the AGES-Reykjavik cohort (case = incident spine or hip fracture; control = no incident spine or hip fracture). From the baseline CT scans, we measured femoral and vertebral strength, as well as bone mineral density (BMD) at the hip (areal BMD only) and lumbar spine (trabecular volumetric BMD only). We found that for incident radiographically confirmed spine fractures (n = 167), the age-adjusted odds ratio for vertebral strength was significant for women (2.8, 95% confidence interval [CI] 1.8 to 4.3) and men (2.2, 95% CI 1.5 to 3.2) and for men remained significant (p = 0.01) independent of vertebral trabecular volumetric BMD. For incident hip fractures (n = 171), the age-adjusted odds ratio for femoral strength was significant for women (4.2, 95% CI 2.6 to 6.9) and men (3.5, 95% CI 2.3 to 5.3) and remained significant after adjusting for femoral neck areal BMD in women and for total hip areal BMD in both sexes; fracture classification improved for women by combining femoral strength with femoral neck areal BMD (p = 0.002). For both sexes, the probabilities of spine and hip fractures were similarly high at the BMD-based interventional thresholds for osteoporosis and at corresponding preestablished thresholds for "fragile bone strength" (spine: women ≤ 4500 N, men ≤ 6500 N; hip: women ≤ 3000 N, men ≤ 3500 N). Because it is well established that individuals over age 65 years who have osteoporosis at the hip or spine by BMD criteria should be considered at high risk of fracture, these results indicate that individuals who have fragile bone strength at the hip or spine should also be considered at high risk of fracture. © 2014 American Society for Bone and Mineral Research.

Wannamethee S.G.,University College London | Welsh P.,University of Glasgow | Whincup P.H.,St George's, University of London | Sawar N.,University of Cambridge | And 4 more authors.
European Journal of Cardiovascular Prevention and Rehabilitation | Year: 2011

Background: Raised adiponectin is associated with increased rather than decreased risk of cardiovascular disease (CVD) and mortality at older age. We examined whether N-terminal pro-brain natriuretic peptide (NT-proBNP), a marker of cardiac dysfunction, may help explain this relationship. Methods and results: A prospective study of 2879 men aged 60-79 years with no history of CVD at baseline followed-up for a mean of 9 years during which there were 196 major coronary heart disease events (fatal and non-fatal myocardial infarction) and 667 deaths (including 225 CVD deaths), whereas adiponectin concentration was inversely associated with several conventional CVD risk factors; it was significantly and positively associated with NT-proBNP concentration. After adjustment for several vascular risk factors, including renal function and muscle mass, relative risks associated with a top third versus bottom third comparison of adiponectin concentration were 1.51 (1.02-2.23) for coronary heart disease, 1.67 (1.15-2.41) for CVD mortality and 1.41 (1.13-1.95) for all cause mortality. Upon further adjustment for NT-proBNP, these relative risks attenuated to 1.31 (0.88-1.94), 1.31 (0.90-1.91) and 1.26 (1.01-1.59), respectively. Conclusion: We show for the first time that concomitantly elevated NT-proBNP concentration, at least, partially explains the apparently positive relationship between adiponectin concentration and risk of CVD and mortality in asymptomatic elderly men. © The European Society of Cardiology 2011.

Murphy R.A.,U.S. National Institute on Aging | Reinders I.,U.S. National Institute on Aging | Garcia M.E.,U.S. National Institute on Aging | Eiriksdottir G.,Icelandic Heart Association Research Institute | And 5 more authors.
Diabetes Care | Year: 2014

OBJECTIVE: Studies in type 2 diabetes report both increased mortality for normal weight and no evidence of an obesity paradox. We aimed to examine whether adipose tissue, muscle size, and physical function, which are known to vary by weight, mediate associations between BMI and mortality. RESEARCH DESIGN AND METHODS: The AGES-Reykjavik cohort comprised participants aged 66-96 years with diabetes defined by fasting glucose, medications, or self-report. BMI was determined from measured height and weight and classified as normal (18.5-24.9 kg/m2, n = 117), overweight (25.0-29.9 kg/m2, n = 293, referent group) or obese (≥30.0 kg/m2, n = 227). Thigh muscle area and intermuscular, visceral, and subcutaneous adipose tissues were assessed with computed tomography. Function was assessed from gait speed and knee extensor strength. Hazard ratios (HRs) and 95% CIs were estimated by Cox proportional hazards regression adjusted for demographics and diabetes-related risk factors. RESULTS: Themedian follow-upwas 6.66 years, and there were 85, 59, and 44 deaths among normal weight, overweight, and obese participants, respectively. There was no mortality risk for obese participants and an increased risk among normal weight comparedwith overweight participants (HR 1.72 [95% CI 1.12-2.64]). Associations remained with adjustment for adipose tissues and knee extensor strength; however, mortality risk for normal weight was attenuated following adjustment for thigh muscle (HR 1.36 [95% CI 0.87-2.11]) and gait speed (HR 1.44 [95% CI 0.91-2.27]). Linear regression confirmed with bootstrapping indicated that thigh muscle size mediated 46% of the relationship between normal weight and mortality. CONCLUSIONS: Normal weight participants had elevated mortality risk compared with overweight participants. This paradoxical association was mediated in part by muscle size. © 2014 by the American Diabetes Association.

Donkor E.S.,University of Ghana | Donkor E.S.,University of Iceland | Owolabi M.O.,University of Ibadan | Bampoh P.,Tamale Central Hospital | And 4 more authors.
BMC Public Health | Year: 2014

Background: Community awareness of stroke, especially the risk factors and warning signs is important in the control of the disease. In sub-Saharan Africa, little is known about community awareness of stroke though the brunt of stroke is currently borne in this region. The aim of the study was to evaluate stroke awareness in Accra (capital city of Ghana) particularly, the risk factors and warning signs. Methods. This was a cross-sectional study involving systematic sampling of 63 households in each of the 11 sub metropolitan areas of Accra. A structured questionnaire was used to collect stroke awareness data from respondents randomly sampled in the selected households. Logistic regression analyses were done to identify predictors of the main outcome variables including recognition of stroke risk factors, stroke warning signs and the organ affected by stroke. Results: Only 40% (n = 277) of the 693 respondents correctly identified the brain as the organ affected in stroke. Similarly, less than half of the respondents could recognize any of the established stroke risk factors as well as any of the established stroke warning signs. Over 70% (n > 485) of the respondents either believed that stroke is a preventable disease, or lifestyle alterations can be made to reduce the risk of stroke, or stroke requires emergency treatment. In multivariate analysis, predictors of stroke awareness were: age <50 years (OR = 0.56, CI = 0.35-0.92, p = 0.021), presence of a stroke risk factor (OR = 2.37, CI = 1.52-3.71, p < 0.001) and Christian Religion (OR = 14.86, CI = 1.37-161.01, p = 0.03). Conclusion: Though stroke is perceived as a serious and preventable disease in Accra, community awareness of the risk factors and warning signs is sub-optimal. This indicates that community-based education programs to increase public awareness of stroke could contribute to decreasing the risk of stroke and to increasing the speed of hospital presentation after stroke onset. © 2014 Donkor et al.; licensee BioMed Central Ltd.

PubMed | U.S. National Institute on Aging, University of California at San Francisco, Icelandic Heart Association Research Institute and University of Cambridge
Type: Journal Article | Journal: Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA | Year: 2016

Association between serum bone formation and resorption markers and bone mineral, structural, and strength variables derived from quantitative computed tomography (QCT) in a population-based cohort of 1745 older adults was assessed. The association was weak for lumbar spine and femoral neck areal and volumetric bone mineral density.The aim of this study was to examine the relationship between levels of bone turnover markers (BTMs; osteocalcin (OC), C-terminal cross-linking telopeptide of type I collagen (CTX), and procollagen type 1N propeptide (P1NP)) and quantitative computed tomography (QCT)-derived bone density, geometry, and strength indices in the lumbar spine and femoral neck (FN).A total of 1745 older individuals (773 men and 972 women, aged 66-92years) from the Age, Gene/Environment Susceptibility (AGES)-Reykjavik cohort were studied. QCT was performed in the lumbar spine and hip to estimate volumetric trabecular, cortical, and integral bone mineral density (BMD), areal BMD, bone geometry, and bone strength indices. Association between BTMs and QCT variables were explored using multivariable linear regression.Major findings showed that all BMD measures, FN cortical index, and compressive strength had a low negative correlation with the BTM levels in both men and women. Correlations between BTMs and bone size parameters were minimal or not significant. No associations were found between BTMs and vertebral cross-sectional area in women. BTMs alone accounted for only a relatively small percentage of the bone parameter variance (1-10%).Serum CTX, OC, and P1NP were weakly correlated with lumbar spine and FN areal and volumetric BMD and strength measures. Most of the bone size indices were not associated with BTMs; thus, the selected bone remodeling markers do not reflect periosteal bone formation. These results confirmed the limited ability of the most sensitive established BTMs to predict bone structural integrity in older adults.

PubMed | U.S. National Institute on Aging, Fred Hutchinson Cancer Research Center, Icelandic Heart Association Research Institute, Cardiovascular Engineering Inc. and 3 more.
Type: Journal Article | Journal: The Journal of nutrition | Year: 2015

Higher intake of polyunsaturated fatty acids (PUFAs) and higher circulating PUFAs are associated with lower cardiovascular disease (CVD) risk. The positive influence of PUFAs might be via lowering arterial stiffness, resulting in a better CVD risk profile; however, studies investigating circulating PUFAs in relation to arterial stiffness in a general population are limited.We investigated the associations of plasma phospholipid n-3 (-3) and n-6 PUFAs and fish oil intake with arterial stiffness.We used data from a subgroup of the Age, Gene/Environment Susceptibility-Reykjavik (AGES-Reykjavik) Study (n = 501, 75.0 4.96 y, 46% men), a population-based study of community-dwelling older adults. Plasma phospholipid PUFAs were measured by GC at baseline, and fish oil intake was assessed at 3 time points: early life (ages 14-19 y), midlife (ages 40-50 y), and late life (ages 66-96 y, AGES-Reykjavik baseline) with the use of a validated food-frequency questionnaire. Arterial stiffness was determined as carotid-femoral pulse wave velocity (cf-PWV) with the use of an electrocardiogram after a mean follow-up of 5.2 0.3 y. Regression coefficients (95% CIs), adjusted for demographics, follow-up time, risk factors, cholesterol, triglycerides, and serum vitamin D, were calculated by linear regression per SD increment in PUFAs.Plasma total n-3 PUFAs, eicosapentaenoic acid, and docosahexaenoic acid were associated with lower cf-PWV [ (95% CI): -0.036 (-0.064, -0.008); -0.031 (-0.059, -0.003); -0.036 (-0.064, -0.009), respectively]. In contrast, plasma total n-6 PUFAs and linoleic acid were associated with higher cf-PWV [0.035 (0.009, 0.061) and 0.034 (0.008, 0.059)]. Regular fish oil consumption at early-, mid-, and late-life was not associated with cf-PWV.Our results show a positive association between plasma n-6 PUFAs and arterial stiffness, and suggest that higher concentrations of plasma long-chain n-3 PUFAs are associated with less arterial stiffness and therein may be one of the mechanisms underlying the association between plasma n-3 PUFAs and lower CVD risk.

PubMed | University of Iceland, U.S. National Institute on Aging, Maastricht University and Icelandic Heart Association Research Institute
Type: Journal Article | Journal: Age and ageing | Year: 2016

the prevalence of sarcopenia increases with age. Physical activity might slow the rate of muscle loss and therewith the incidence of examine the association of physical activity with incident sarcopenia over a 5-year from the population-based Age, Gene/Environment, Susceptibility-Reykjavik Study were used.people residing in the Reykjavik area at the start of the study.the study included people aged 66-93 years (n = 2309).the amount of moderate-vigorous physical activity (MVPA) was assessed by a self-reported questionnaire. Sarcopenia was identified using the European Working Group on Sarcopenia in Older People algorithm, including muscle mass (computed tomography imaging), grip strength (computerised dynamometer) and gait speed (6 m).mean age of the participants was 74.9 4.7 years. The prevalence of sarcopenia was 7.3% at baseline and 16.8% at follow-up. The incidence proportion of sarcopenia over 5 years was 14.8% in the least-active individuals and 9.0% in the most-active individuals. Compared with the least-active participants, those reporting a moderate-high amount of MVPA had a significantly lower likelihood of incident sarcopenia (OR = 0.64, 95% CI 0.45-0.91). Participants with a high amount of MVPA had higher baseline levels of muscle mass, strength and walking speed, but baseline MVPA was not associated with the rate of muscle loss.a higher amount of MVPA seems to contribute to counteracting the development of sarcopenia. To delay the onset of sarcopenia and its potential adverse outcomes, attention should be paid to increasing physical activity levels in older adults.

PubMed | University of Otago, CNR Institute of Neuroscience, Icelandic Heart Association Research Institute, University of Verona and 38 more.
Type: Journal Article | Journal: PloS one | Year: 2015

We tested for interactions between body mass index (BMI) and common genetic variants affecting serum urate levels, genome-wide, in up to 42569 participants. Both stratified genome-wide association (GWAS) analyses, in lean, overweight and obese individuals, and regression-type analyses in a non BMI-stratified overall sample were performed. The former did not uncover any novel locus with a major main effect, but supported modulation of effects for some known and potentially new urate loci. The latter highlighted a SNP at RBFOX3 reaching genome-wide significant level (effect size 0.014, 95% CI 0.008-0.02, Pinter= 2.6 x 10-8). Two top loci in interaction term analyses, RBFOX3 and ERO1LB-EDARADD, also displayed suggestive differences in main effect size between the lean and obese strata. All top ranking loci for urate effect differences between BMI categories were novel and most had small magnitude but opposite direction effects between strata. They include the locus RBMS1-TANK (men, Pdifflean-overweight= 4.7 x 10-8), a region that has been associated with several obesity related traits, and TSPYL5 (men, Pdifflean-overweight= 9.1 x 10-8), regulating adipocytes-produced estradiol. The top-ranking known urate loci was ABCG2, the strongest known gout risk locus, with an effect halved in obese compared to lean men (Pdifflean-obese= 2 x 10-4). Finally, pathway analysis suggested a role for N-glycan biosynthesis as a prominent urate-associated pathway in the lean stratum. These results illustrate a potentially powerful way to monitor changes occurring in obesogenic environment.

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