@article {5854, title = {Hypertension and low HDL cholesterol were associated with reduced kidney function across the age spectrum: a collaborative study.}, journal = {Ann Epidemiol}, volume = {23}, year = {2013}, month = {2013 Mar}, pages = {106-11}, abstract = {

PURPOSE: To determine if the associations among established risk factors and reduced kidney function vary by age.

METHODS: We pooled cross-sectional data from 14,788 nondiabetics aged 40 to 100 years in 4 studies: Cardiovascular Health Study, Health, Aging, and Body Composition Study, Multi-Ethnic Study of Atherosclerosis, and Prevention of Renal and Vascular End-Stage Disease cohort.

RESULTS: Hypertension and low high-density lipoprotein (HDL) cholesterol were associated with reduced cystatin C-based estimated glomerular filtration rate (eGFR) across the age spectrum. In adjusted analyses, hypertension was associated with a 2.3 (95\% confidence interval [CI], 0.1, 4.4), 5.1 (95\% CI, 4.1, 6.1), and 6.9 (95\%~CI, 3.0, 10.4) mL/min/1.73 m(2) lower eGFR in participants 40 to 59, 60 to 79, and at least 80~years, respectively (P for interaction < .001). The association of low HDL cholesterol with reduced kidney function was also greater in the older age groups: 4.9 (95\% CI, 3.5, 6.3), 7.1 (95\% CI, 6.0, 8.3), 8.9 (95\% CI, 5.4, 11.9) mL/min/1.73 m(2) (P for interaction < .001). Smoking and obesity were associated with reduced kidney function in participants under 80 years. All estimates of the potential population impact of the risk factors were modest.

CONCLUSIONS: Hypertension, obesity, smoking, and low HDL cholesterol are modestly associated with reduced kidney function in nondiabetics. The associations of hypertension and HDL cholesterol with reduced kidney function seem to be stronger in older adults.

}, keywords = {Adult, Age Factors, Aged, Aged, 80 and over, Aging, Causality, Cholesterol, LDL, Cohort Studies, Comorbidity, Cross-Sectional Studies, Cystatin C, Female, Humans, Hypertension, Kidney Function Tests, Male, Netherlands, Obesity, Prevalence, Renal Insufficiency, Chronic, Risk Factors, Smoking, United States}, issn = {1873-2585}, doi = {10.1016/j.annepidem.2012.12.004}, author = {Odden, Michelle C and Tager, Ira B and Gansevoort, Ron T and Bakker, Stephan J L and Fried, Linda F and Newman, Anne B and Katz, Ronit and Satterfield, Suzanne and Harris, Tamara B and Sarnak, Mark J and Siscovick, David and Shlipak, Michael G} } @article {5998, title = {The QT interval and risk of incident atrial fibrillation.}, journal = {Heart Rhythm}, volume = {10}, year = {2013}, month = {2013 Oct}, pages = {1562-8}, abstract = {

BACKGROUND: Abnormal atrial repolarization is important in the development of atrial fibrillation (AF), but no direct measurement is available in clinical medicine.

OBJECTIVE: To determine whether the QT interval, a marker of ventricular repolarization, could be used to predict incident AF.

METHODS: We examined a prolonged QT interval corrected by using the Framingham formula (QT(Fram)) as a predictor of incident AF in the Atherosclerosis Risk in Communities (ARIC) study. The Cardiovascular Health Study (CHS) and Health, Aging, and Body Composition (ABC) study were used for validation. Secondary predictors included QT duration as a continuous variable, a short QT interval, and QT intervals corrected by using other formulas.

RESULTS: Among 14,538 ARIC study participants, a prolonged QT(Fram) predicted a roughly 2-fold increased risk of AF (hazard ratio [HR] 2.05; 95\% confidence interval [CI] 1.42-2.96; P < .001). No substantive attenuation was observed after adjustment for age, race, sex, study center, body mass index, hypertension, diabetes, coronary disease, and heart failure. The findings were validated in Cardiovascular Health Study and Health, Aging, and Body Composition study and were similar across various QT correction methods. Also in the ARIC study, each 10-ms increase in QT(Fram) was associated with an increased unadjusted (HR 1.14; 95\% CI 1.10-1.17; P < .001) and adjusted (HR 1.11; 95\% CI 1.07-1.14; P < .001) risk of AF. Findings regarding a short QT interval were inconsistent across cohorts.

CONCLUSIONS: A prolonged QT interval is associated with an increased risk of incident AF.

}, keywords = {Aged, Atrial Fibrillation, Cohort Studies, Electrocardiography, Female, Humans, Incidence, Long QT Syndrome, Male, Middle Aged, Risk Factors}, issn = {1556-3871}, doi = {10.1016/j.hrthm.2013.07.023}, author = {Mandyam, Mala C and Soliman, Elsayed Z and Alonso, Alvaro and Dewland, Thomas A and Heckbert, Susan R and Vittinghoff, Eric and Cummings, Steven R and Ellinor, Patrick T and Chaitman, Bernard R and Stocke, Karen and Applegate, William B and Arking, Dan E and Butler, Javed and Loehr, Laura R and Magnani, Jared W and Murphy, Rachel A and Satterfield, Suzanne and Newman, Anne B and Marcus, Gregory M} } @article {7161, title = {Gait Speed Predicts Incident Disability: A Pooled Analysis.}, journal = {J Gerontol A Biol Sci Med Sci}, volume = {71}, year = {2016}, month = {2016 Jan}, pages = {63-71}, abstract = {

BACKGROUND: Functional independence with aging is an important goal for individuals and society. Simple prognostic indicators can inform health promotion and care planning, but evidence is limited by heterogeneity in measures of function.

METHODS: We performed a pooled analysis of data from seven studies of 27,220 community-dwelling older adults aged 65 or older with baseline gait speed, followed for disability and mortality. Outcomes were incident inability or dependence on another person in bathing or dressing; and difficulty walking {\textonequarter} - {\textonehalf} mile or climbing 10 steps within 3 years.

RESULTS: Participants with faster baseline gait had lower rates of incident disability. In subgroups (defined by 0.2 m/s-wide intervals from <0.4 to >= 1.4 m/s) with increasingly greater gait speed, 3-year rates of bathing or dressing dependence trended from 10\% to 1\% in men, and from 15\% to 1\% in women, while mobility difficulty trended from 47\% to 4\% in men and 40\% to 6\% in women. The age-adjusted relative risk ratio per 0.1 m/s greater speed for bathing or dressing dependence in men was 0.68 (0.57-0.81) and in women: 0.74 (0.66-0.82); for mobility difficulty, men: 0.75 (0.68-0.82), women: 0.73 (0.67-0.80). Results were similar for combined disability and mortality. Effects were largely consistent across subgroups based on age, gender, race, body mass index, prior hospitalization, and selected chronic conditions. In the presence of multiple other risk factors for disability, gait speed significantly increased the area under the receiver operator characteristic curve.

CONCLUSION: In older adults, gait speed predicts 3 year incidence of bathing or dressing dependence, mobility difficulty, and a composite outcome of disability and mortality.

}, keywords = {Activities of Daily Living, Aged, Aged, 80 and over, Aging, Cohort Studies, Disability Evaluation, Disabled Persons, Female, Gait, Geriatric Assessment, Humans, Independent Living, Male, Mobility Limitation, Predictive Value of Tests, Prognosis, Psychomotor Performance, Risk Assessment, Risk Factors, ROC Curve, Survival Analysis, United States}, issn = {1758-535X}, doi = {10.1093/gerona/glv126}, author = {Perera, Subashan and Patel, Kushang V and Rosano, Caterina and Rubin, Susan M and Satterfield, Suzanne and Harris, Tamara and Ensrud, Kristine and Orwoll, Eric and Lee, Christine G and Chandler, Julie M and Newman, Anne B and Cauley, Jane A and Guralnik, Jack M and Ferrucci, Luigi and Studenski, Stephanie A} } @article {7600, title = {Large meta-analysis of genome-wide association studies identifies five loci for lean body mass.}, journal = {Nat Commun}, volume = {8}, year = {2017}, month = {2017 Jul 19}, pages = {80}, abstract = {

Lean body mass, consisting mostly of skeletal muscle, is important for healthy aging. We performed a genome-wide association study for whole body (20 cohorts of European ancestry with n = 38,292) and appendicular (arms and legs) lean body mass (n = 28,330) measured using dual energy X-ray absorptiometry or bioelectrical impedance analysis, adjusted for sex, age, height, and fat mass. Twenty-one single-nucleotide polymorphisms were significantly associated with lean body mass either genome wide (p < 5 {\texttimes} 10-8) or suggestively genome wide (p < 2.3 {\texttimes} 10-6). Replication in 63,475 (47,227 of European ancestry) individuals from 33 cohorts for whole body lean body mass and in 45,090 (42,360 of European ancestry) subjects from 25 cohorts for appendicular lean body mass was successful for five single-nucleotide polymorphisms in/near HSD17B11, VCAN, ADAMTSL3, IRS1, and FTO for total lean body mass and for three single-nucleotide polymorphisms in/near VCAN, ADAMTSL3, and IRS1 for appendicular lean body mass. Our findings provide new insight into the genetics of lean body mass.Lean body mass is a highly heritable trait and is associated with various health conditions. Here, Kiel and colleagues perform a meta-analysis of genome-wide association studies for whole body lean body mass and find five novel genetic loci to be significantly associated.

}, issn = {2041-1723}, doi = {10.1038/s41467-017-00031-7}, author = {Zillikens, M Carola and Demissie, Serkalem and Hsu, Yi-Hsiang and Yerges-Armstrong, Laura M and Chou, Wen-Chi and Stolk, Lisette and Livshits, Gregory and Broer, Linda and Johnson, Toby and Koller, Daniel L and Kutalik, Zolt{\'a}n and Luan, Jian{\textquoteright}an and Malkin, Ida and Ried, Janina S and Smith, Albert V and Thorleifsson, Gudmar and Vandenput, Liesbeth and Hua Zhao, Jing and Zhang, Weihua and Aghdassi, Ali and {\r A}kesson, Kristina and Amin, Najaf and Baier, Leslie J and Barroso, In{\^e}s and Bennett, David A and Bertram, Lars and Biffar, Rainer and Bochud, Murielle and Boehnke, Michael and Borecki, Ingrid B and Buchman, Aron S and Byberg, Liisa and Campbell, Harry and Campos Obanda, Natalia and Cauley, Jane A and Cawthon, Peggy M and Cederberg, Henna and Chen, Zhao and Cho, Nam H and Jin Choi, Hyung and Claussnitzer, Melina and Collins, Francis and Cummings, Steven R and De Jager, Philip L and Demuth, Ilja and Dhonukshe-Rutten, Rosalie A M and Diatchenko, Luda and Eiriksdottir, Gudny and Enneman, Anke W and Erdos, Mike and Eriksson, Johan G and Eriksson, Joel and Estrada, Karol and Evans, Daniel S and Feitosa, Mary F and Fu, Mao and Garcia, Melissa and Gieger, Christian and Girke, Thomas and Glazer, Nicole L and Grallert, Harald and Grewal, Jagvir and Han, Bok-Ghee and Hanson, Robert L and Hayward, Caroline and Hofman, Albert and Hoffman, Eric P and Homuth, Georg and Hsueh, Wen-Chi and Hubal, Monica J and Hubbard, Alan and Huffman, Kim M and Husted, Lise B and Illig, Thomas and Ingelsson, Erik and Ittermann, Till and Jansson, John-Olov and Jordan, Joanne M and Jula, Antti and Karlsson, Magnus and Khaw, Kay-Tee and Kilpel{\"a}inen, Tuomas O and Klopp, Norman and Kloth, Jacqueline S L and Koistinen, Heikki A and Kraus, William E and Kritchevsky, Stephen and Kuulasmaa, Teemu and Kuusisto, Johanna and Laakso, Markku and Lahti, Jari and Lang, Thomas and Langdahl, Bente L and Launer, Lenore J and Lee, Jong-Young and Lerch, Markus M and Lewis, Joshua R and Lind, Lars and Lindgren, Cecilia and Liu, Yongmei and Liu, Tian and Liu, Youfang and Ljunggren, Osten and Lorentzon, Mattias and Luben, Robert N and Maixner, William and McGuigan, Fiona E and Medina-G{\'o}mez, Carolina and Meitinger, Thomas and Melhus, H{\r a}kan and Mellstr{\"o}m, Dan and Melov, Simon and Micha{\"e}lsson, Karl and Mitchell, Braxton D and Morris, Andrew P and Mosekilde, Leif and Newman, Anne and Nielson, Carrie M and O{\textquoteright}Connell, Jeffrey R and Oostra, Ben A and Orwoll, Eric S and Palotie, Aarno and Parker, Stephen C J and Peacock, Munro and Perola, Markus and Peters, Annette and Polasek, Ozren and Prince, Richard L and R{\"a}ikk{\"o}nen, Katri and Ralston, Stuart H and Ripatti, Samuli and Robbins, John A and Rotter, Jerome I and Rudan, Igor and Salomaa, Veikko and Satterfield, Suzanne and Schadt, Eric E and Schipf, Sabine and Scott, Laura and Sehmi, Joban and Shen, Jian and Soo Shin, Chan and Sigurdsson, Gunnar and Smith, Shad and Soranzo, Nicole and Stan{\v c}{\'a}kov{\'a}, Alena and Steinhagen-Thiessen, Elisabeth and Streeten, Elizabeth A and Styrkarsdottir, Unnur and Swart, Karin M A and Tan, Sian-Tsung and Tarnopolsky, Mark A and Thompson, Patricia and Thomson, Cynthia A and Thorsteinsdottir, Unnur and Tikkanen, Emmi and Tranah, Gregory J and Tuomilehto, Jaakko and van Schoor, Natasja M and Verma, Arjun and Vollenweider, Peter and V{\"o}lzke, Henry and Wactawski-Wende, Jean and Walker, Mark and Weedon, Michael N and Welch, Ryan and Wichmann, H-Erich and Widen, Elisabeth and Williams, Frances M K and Wilson, James F and Wright, Nicole C and Xie, Weijia and Yu, Lei and Zhou, Yanhua and Chambers, John C and D{\"o}ring, Angela and van Duijn, Cornelia M and Econs, Michael J and Gudnason, Vilmundur and Kooner, Jaspal S and Psaty, Bruce M and Spector, Timothy D and Stefansson, Kari and Rivadeneira, Fernando and Uitterlinden, Andr{\'e} G and Wareham, Nicholas J and Ossowski, Vicky and Waterworth, Dawn and Loos, Ruth J F and Karasik, David and Harris, Tamara B and Ohlsson, Claes and Kiel, Douglas P} } @article {8572, title = {Visit-to-Visit Blood Pressure Variability and Mortality and Cardiovascular Outcomes Among Older Adults: The Health, Aging, and Body Composition Study.}, journal = {Am J Hypertens}, volume = {30}, year = {2017}, month = {2017 Feb}, pages = {151-158}, abstract = {

BACKGROUND: Level of blood pressure (BP) is strongly associated with cardiovascular (CV) events and mortality. However, it is questionable whether mean BP can fully capture BP-related vascular risk. Increasing attention has been given to the value of visit-to-visit BP variability.

METHODS: We examined the association of visit-to-visit BP variability with mortality, incident myocardial infarction (MI), and incident stroke among 1,877 well-functioning elders in the Health, Aging, and Body Composition Study. We defined visit-to-visit diastolic BP (DBP) and systolic BP (SBP) variability as the root-mean-square error of person-specific linear regression of BP as a function of time. Alternatively, we counted the number of considerable BP increases and decreases (separately; 10mm Hg for DBP and 20mm Hg for SBP) between consecutive visits for each individual.

RESULTS: Over an average follow-up of 8.5 years, 623 deaths (207 from CV disease), 153 MIs, and 156 strokes occurred. The median visit-to-visit DBP and SBP variability was 4.96 mmHg and 8.53 mmHg, respectively. After multivariable adjustment, visit-to-visit DBP variability was related to higher all-cause (hazard ratio (HR) = 1.18 per 1 SD, 95\% confidence interval (CI) = 1.01-1.37) and CV mortality (HR = 1.35, 95\% CI = 1.05-1.73). Additionally, individuals having more considerable decreases of DBP (>=10mm Hg between 2 consecutive visits) had higher risk of all-cause (HR = 1.13, 95\% CI = 0.99-1.28) and CV mortality (HR = 1.30, 95\% CI = 1.05-1.61); considerable increases of SBP (>=20mm Hg) were associated with higher risk of all-cause (HR = 1.18, 95\% CI = 1.03-1.36) and CV mortality (HR = 1.37, 95\% CI = 1.08-1.74).

CONCLUSIONS: Visit-to-visit DBP variability and considerable changes in DBP and SBP were risk factors for mortality in the elderly.

}, keywords = {Aged, Aging, Blood Pressure, Blood Pressure Determination, Body Composition, California, Cohort Studies, Female, Health Status, Humans, Hypertension, Incidence, Longitudinal Studies, Male, Myocardial Infarction, Office Visits, Prognosis, Retrospective Studies, Risk Factors, Stroke, Survival Rate}, issn = {1941-7225}, doi = {10.1093/ajh/hpw106}, author = {Wu, Chenkai and Shlipak, Michael G and Stawski, Robert S and Peralta, Carmen A and Psaty, Bruce M and Harris, Tamara B and Satterfield, Suzanne and Shiroma, Eric J and Newman, Anne B and Odden, Michelle C} } @article {7974, title = {Disentangling the genetics of lean mass.}, journal = {Am J Clin Nutr}, volume = {109}, year = {2019}, month = {2019 Feb 01}, pages = {276-287}, abstract = {

Background: Lean body mass (LM) plays an important role in mobility and metabolic function. We previously identified five loci associated with LM adjusted for fat mass in kilograms. Such an adjustment may reduce the power to identify genetic signals having an association with both lean mass and fat mass.

Objectives: To determine the impact of different fat mass adjustments on genetic architecture of LM and identify additional LM loci.

Methods: We performed genome-wide association analyses for whole-body LM (20 cohorts of European ancestry with n~=~38,292) measured using dual-energy X-ray absorptiometry) or bioelectrical impedance analysis, adjusted for sex, age, age2, and height with or without fat mass adjustments (Model 1 no fat adjustment; Model 2 adjustment for fat mass as a percentage of body mass; Model 3 adjustment for fat mass in kilograms).

Results: Seven single-nucleotide polymorphisms (SNPs) in separate loci, including one novel LM locus (TNRC6B), were successfully replicated in an additional 47,227 individuals from 29 cohorts. Based on the strengths of the associations in Model 1 vs Model 3, we divided the LM loci into those with an effect on both lean mass and fat mass in the same direction and refer to those as "sumo wrestler" loci (FTO and MC4R). In contrast, loci with an impact specifically on LM were termed "body builder" loci (VCAN and ADAMTSL3). Using existing available genome-wide association study databases, LM increasing alleles of SNPs in sumo wrestler loci were associated with an adverse metabolic profile, whereas LM increasing alleles of SNPs in "body builder" loci were associated with metabolic protection.

Conclusions: In conclusion, we identified one novel LM locus (TNRC6B). Our results suggest that a genetically determined increase in lean mass might exert either harmful or protective effects on metabolic traits, depending on its relation to fat mass.

}, issn = {1938-3207}, doi = {10.1093/ajcn/nqy272}, author = {Karasik, David and Zillikens, M Carola and Hsu, Yi-Hsiang and Aghdassi, Ali and {\r A}kesson, Kristina and Amin, Najaf and Barroso, In{\^e}s and Bennett, David A and Bertram, Lars and Bochud, Murielle and Borecki, Ingrid B and Broer, Linda and Buchman, Aron S and Byberg, Liisa and Campbell, Harry and Campos-Obando, Natalia and Cauley, Jane A and Cawthon, Peggy M and Chambers, John C and Chen, Zhao and Cho, Nam H and Choi, Hyung Jin and Chou, Wen-Chi and Cummings, Steven R and de Groot, Lisette C P G M and De Jager, Phillip L and Demuth, Ilja and Diatchenko, Luda and Econs, Michael J and Eiriksdottir, Gudny and Enneman, Anke W and Eriksson, Joel and Eriksson, Johan G and Estrada, Karol and Evans, Daniel S and Feitosa, Mary F and Fu, Mao and Gieger, Christian and Grallert, Harald and Gudnason, Vilmundur and Lenore, Launer J and Hayward, Caroline and Hofman, Albert and Homuth, Georg and Huffman, Kim M and Husted, Lise B and Illig, Thomas and Ingelsson, Erik and Ittermann, Till and Jansson, John-Olov and Johnson, Toby and Biffar, Reiner and Jordan, Joanne M and Jula, Antti and Karlsson, Magnus and Khaw, Kay-Tee and Kilpel{\"a}inen, Tuomas O and Klopp, Norman and Kloth, Jacqueline S L and Koller, Daniel L and Kooner, Jaspal S and Kraus, William E and Kritchevsky, Stephen and Kutalik, Zolt{\'a}n and Kuulasmaa, Teemu and Kuusisto, Johanna and Laakso, Markku and Lahti, Jari and Lang, Thomas and Langdahl, Bente L and Lerch, Markus M and Lewis, Joshua R and Lill, Christina and Lind, Lars and Lindgren, Cecilia and Liu, Yongmei and Livshits, Gregory and Ljunggren, Osten and Loos, Ruth J F and Lorentzon, Mattias and Luan, Jian{\textquoteright}an and Luben, Robert N and Malkin, Ida and McGuigan, Fiona E and Medina-G{\'o}mez, Carolina and Meitinger, Thomas and Melhus, H{\r a}kan and Mellstr{\"o}m, Dan and Micha{\"e}lsson, Karl and Mitchell, Braxton D and Morris, Andrew P and Mosekilde, Leif and Nethander, Maria and Newman, Anne B and O{\textquoteright}Connell, Jeffery R and Oostra, Ben A and Orwoll, Eric S and Palotie, Aarno and Peacock, Munro and Perola, Markus and Peters, Annette and Prince, Richard L and Psaty, Bruce M and R{\"a}ikk{\"o}nen, Katri and Ralston, Stuart H and Ripatti, Samuli and Rivadeneira, Fernando and Robbins, John A and Rotter, Jerome I and Rudan, Igor and Salomaa, Veikko and Satterfield, Suzanne and Schipf, Sabine and Shin, Chan Soo and Smith, Albert V and Smith, Shad B and Soranzo, Nicole and Spector, Timothy D and Stan{\v c}{\'a}kov{\'a}, Alena and Stefansson, Kari and Steinhagen-Thiessen, Elisabeth and Stolk, Lisette and Streeten, Elizabeth A and Styrkarsdottir, Unnur and Swart, Karin M A and Thompson, Patricia and Thomson, Cynthia A and Thorleifsson, Gudmar and Thorsteinsdottir, Unnur and Tikkanen, Emmi and Tranah, Gregory J and Uitterlinden, Andr{\'e} G and van Duijn, Cornelia M and van Schoor, Natasja M and Vandenput, Liesbeth and Vollenweider, Peter and V{\"o}lzke, Henry and Wactawski-Wende, Jean and Walker, Mark and J Wareham, Nicholas and Waterworth, Dawn and Weedon, Michael N and Wichmann, H-Erich and Widen, Elisabeth and Williams, Frances M K and Wilson, James F and Wright, Nicole C and Yerges-Armstrong, Laura M and Yu, Lei and Zhang, Weihua and Zhao, Jing Hua and Zhou, Yanhua and Nielson, Carrie M and Harris, Tamara B and Demissie, Serkalem and Kiel, Douglas P and Ohlsson, Claes} }