Publications by authors named "Vadim Zipunnikov"

78Publications

Association between brain volumes and patterns of physical activity in community-dwelling older adults.

J Gerontol A Biol Sci Med Sci 2020 Nov 24. Epub 2020 Nov 24.

Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.

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http://dx.doi.org/10.1093/gerona/glaa294DOI Listing
November 2020

Methods for Step Count Data: Determining "Valid" Days and Quantifying Fragmentation of Walking Bouts.

Gait Posture 2020 09 7;81:205-212. Epub 2020 Aug 7.

Johns Hopkins Bloomberg School of Public Health, 415 N. Washington Street, Baltimore, MD, 21205, United States.

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http://dx.doi.org/10.1016/j.gaitpost.2020.07.149DOI Listing
September 2020

Associations of Actigraphic Sleep Parameters With Fatigability in Older Adults.

J Gerontol A Biol Sci Med Sci 2020 Sep;75(9):e95-e102

Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.

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http://dx.doi.org/10.1093/gerona/glaa137DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7494020PMC
September 2020

Organizing and analyzing the activity data in NHANES.

Stat Biosci 2019 Jul 9;11(2):262-287. Epub 2019 Feb 9.

Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, USA.

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http://dx.doi.org/10.1007/s12561-018-09229-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7012355PMC
July 2019

Comparison of Multivendor Single-Voxel MR Spectroscopy Data Acquired in Healthy Brain at 26 Sites.

Radiology 2020 04 11;295(1):171-180. Epub 2020 Feb 11.

From the Division of Neuroradiology, Park 367B, Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, 600 N Wolfe St, Baltimore, MD 21287 (M.P., M.M., A.B., K.L.C., G.O., N.A.J.P., M.G.S., R.A.E.E., P.B.B.); F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, MD (M.P., M.M., A.B., K.L.C., G.O., N.A.J.P., M.G.S., R.A.E.E., P.B.B.); Imaging Institute, Cleveland Clinic Foundation, Cleveland, OH (P.K.B.); Department of Radiology, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, OH (P.K.B.); Department of Radiology, Haukeland University Hospital, Bergen, Norway (M.K.B.); Spinoza Centre for Neuroimaging, Amsterdam, the Netherlands (P.F.B., D.S.); Department of Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH (K.M.C.); Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD (K.L.C.); Department of Radiology, Taipei Medical University Shuang Ho Hospital, New Taipei City, Taiwan (D.Y.T.C.); Department of Radiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan (D.Y.T.C.); Department of Biological and Medical Psychology, University of Bergen, Bergen, Norway (A.R.C., L.E.); NOreMENT-Norwegian Center for Mental Disorders Research, University of Bergen, Bergen, Norway (A.R.C., L.E.); Movement Control & Neuroplasticity Research Group, Department of Movement Sciences, Group of Biomedical Sciences, KU Leuven, Leuven, Belgium (K.C., C.M., S.P.S.); REVAL Rehabilitation Research Center, Hasselt University, Diepenbeek, Belgium (K.C.); Department of Radiology, Medical Physics, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany (M.D., T.L.); Brain and Consciousness Research Centre, Taipei Medical University, Taipei, Taiwan (N.W.D.); School of Health Sciences, Purdue University, West Lafayette, IN (U.D., D.A.E., R.M.); Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN (U.D., D.A.E.); Department of Neuroimaging, Central Institute of Mental Health, Mannheim, Germany (G.E., M.S.); Department of Clinical Engineering, Haukeland University Hospital, Bergen, Norway (A.R.C., L.E.); Department of Clinical and Health Psychology, University of Florida, Gainesville, FL (M.A.F., E.C.P., A.J.W.); Center for Cognitive Aging and Memory, McKnight Brain Institute, University of Florida, Gainesville, FL (M.A.F., E.C.P., A.J.W.); Shandong Medical Imaging Research Institute, Shandong University, Jinan, China (F.G., G.W.); Department of Human Physiology, University of Oregon, Eugene, OR (I.G.); Department of Radiology, University of Calgary, Calgary, Canada (A.D.H.); Department of Radiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China (N. He, Y.L., H.X., F.Y.); Department of Neurology, BG University Hospital Bergmannsheil, Bochum, Germany (S.H., M.T.); Academic Unit of Radiology, University of Sheffield, Sheffield, England (N. Hoggard, I.D.W.); Department of Radiology, Taipei Veterans General Hospital, National Yang-Ming University School of Medicine, Taipei, Taiwan (T.W.H., J.K.L., J.F.L.); Department of Radiology, Maastricht University Medical Center, Maastricht, the Netherlands (J.F.A.J.); Department of Psychiatry, Columbia University, New York, NY (A.K.. M.M.O.); New York State Psychiatric Institute, New York, NY (A.K., F.L.); GE Healthcare, Calgary, Canada (R.M.L.); GE Healthcare, Taipei, Taiwan (C.Y.E.L.); Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL (J.R.L.); National High Magnetic Field Laboratory, Gainesville, FL (J.R.L.); Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, MN (R.M.); Department of Psychology, University of Washington, Seattle, WA (S.O.M., M.P.S.); Center for Mind and Brain, University of California, Davis, Davis, CA (S.N.); GE Healthcare, Berlin, Germany (R.N.); Department of Electrical and Computer Engineering, McMaster University, Hamilton, Canada (M.D.N.); Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, SC (J.J.P.); Department of Radiology, Children's Hospital of Philadelphia, Philadelphia, PA (T.P.L.R.); Research Imaging Centre, Centre for Addiction and Mental Health, Toronto, Canada (N. Sailasuta, P.T.); Department of Psychiatry, University of Toronto, Toronto, Canada (N. Sailasuta); Department of Psychiatry and Behavioral Sciences, University of Minnesota, Minneapolis, MN (M.P.S.); School of Biomedical Engineering, McMaster University, Hamilton, Canada (N. Simard); Leuven Brain Institute (LBI), KU Leuven, Leuven, Belgium (S.P.S.); Department of Diagnostic and Interventional Radiology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany (H.J.W., H.J.Z.); Department of Functional Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China (C.Z.); Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD (A.Y.); and Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany (H.J.Z.).

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http://dx.doi.org/10.1148/radiol.2020191037DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7104702PMC
April 2020

Longitudinal Association Between Energy Regulation and Fatigability in Mid-to-Late Life.

J Gerontol A Biol Sci Med Sci 2020 Sep;75(9):e74-e80

Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.

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http://dx.doi.org/10.1093/gerona/glaa011DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7494036PMC
September 2020

Accelerometry data in health research: challenges and opportunities.

Stat Biosci 2019 Jul 12;11(2):210-237. Epub 2019 Jan 12.

Center on Aging and Health, Division of Geriatric Medicine and Gerontology, Department of Medicine, School of Medicine, Johns Hopkins University,

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http://dx.doi.org/10.1007/s12561-018-9227-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6874221PMC
July 2019

Association of Total Daily Physical Activity and Fragmented Physical Activity With Mortality in Older Adults.

JAMA Netw Open 2019 10 2;2(10):e1912352. Epub 2019 Oct 2.

Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.

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http://dx.doi.org/10.1001/jamanetworkopen.2019.12352DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6777397PMC
October 2019

Big GABA II: Water-referenced edited MR spectroscopy at 25 research sites.

Neuroimage 2019 05 3;191:537-548. Epub 2019 Mar 3.

Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD, USA; F. M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, MD, USA.

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http://dx.doi.org/10.1016/j.neuroimage.2019.02.059DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6818968PMC
May 2019

Mood reactivity and affective dynamics in mood and anxiety disorders.

J Abnorm Psychol 2018 Oct;127(7):659-669

Genetic Epidemiology Research Branch, Intramural Research Program, National Institute of Mental Health.

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http://doi.apa.org/getdoi.cfm?doi=10.1037/abn0000378
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http://dx.doi.org/10.1037/abn0000378DOI Listing
October 2018

Continuous Near-Infrared Spectroscopy Demonstrates Limitations in Monitoring the Development of Acute Compartment Syndrome in Patients with Leg Injuries.

J Bone Joint Surg Am 2018 Oct;100(19):1645-1652

Departments of Health Policy and Management (K.P.F. and E.M.) and Biostatistics (J.D. and V.Z.), Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.

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http://dx.doi.org/10.2106/JBJS.17.01495DOI Listing
October 2018

Contrasting characteristics of daily physical activity in older adults by cancer history.

Cancer 2018 12 1;124(24):4692-4699. Epub 2018 Oct 1.

Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.

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http://dx.doi.org/10.1002/cncr.31745DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6294692PMC
December 2018

Registration for exponential family functional data.

Biometrics 2019 03 19;75(1):48-57. Epub 2018 Sep 19.

Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, New York, U.S.A.

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http://dx.doi.org/10.1111/biom.12963DOI Listing
March 2019

Novel metrics for growth model selection.

Emerg Themes Epidemiol 2018 23;15. Epub 2018 Feb 23.

1Division of Pulmonary and Critical Care, School of Medicine, Johns Hopkins University, 1830 E. Monument Street, 5th Floor, Baltimore, MD 21287 USA.

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http://dx.doi.org/10.1186/s12982-018-0072-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5824542PMC
February 2018

Prediction of sustained harmonic walking in the free-living environment using raw accelerometry data.

Physiol Meas 2018 02 28;39(2):02NT02. Epub 2018 Feb 28.

Division of Geriatric Medicine and Gerontology, Department of Medicine, School of Medicine, Johns Hopkins University, Baltimore, MD, United States of America.

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http://dx.doi.org/10.1088/1361-6579/aaa74dDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5875188PMC
February 2018

Epidemiology of objectively measured bedtime and chronotype in US adolescents and adults: NHANES 2003-2006.

Chronobiol Int 2018 03 28;35(3):416-434. Epub 2017 Dec 28.

d Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health , Baltimore , Maryland , US.

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http://dx.doi.org/10.1080/07420528.2017.1411359DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5862775PMC
March 2018

Total volume of physical activity: TAC, TLAC or TAC(λ).

Prev Med 2018 01 11;106:233-235. Epub 2017 Nov 11.

Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States.

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http://dx.doi.org/10.1016/j.ypmed.2017.10.028DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5897896PMC
January 2018

Perceived Fatigability and Objective Physical Activity in Mid- to Late-Life.

J Gerontol A Biol Sci Med Sci 2018 04;73(5):630-635

Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.

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https://academic.oup.com/biomedgerontology/article/73/5/630/
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http://dx.doi.org/10.1093/gerona/glx181DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5905638PMC
April 2018

Validation of Gait Characteristics Extracted From Raw Accelerometry During Walking Against Measures of Physical Function, Mobility, Fatigability, and Fitness.

J Gerontol A Biol Sci Med Sci 2018 04;73(5):676-681

Department of Epidemiology, Center for Aging and Population Health, Graduate School of Public Health, University of Pittsburgh, Pennsylvania.

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http://dx.doi.org/10.1093/gerona/glx174DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5905654PMC
April 2018

Objectively Measured Physical Activity and Falls in Well-Functioning Older Adults: Findings From the Baltimore Longitudinal Study of Aging.

Am J Phys Med Rehabil 2018 04;97(4):255-260

From the Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland (AJN, AA, VZ, JAS); Department of Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland (AJN); and National Institute of Aging, Baltimore, Maryland (EMS, LF).

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http://dx.doi.org/10.1097/PHM.0000000000000830DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5851797PMC
April 2018

Re-evaluating the effect of age on physical activity over the lifespan.

Prev Med 2017 Aug 1;101:102-108. Epub 2017 Jun 1.

Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States.

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http://dx.doi.org/10.1016/j.ypmed.2017.05.030DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5541765PMC
August 2017

Longitudinal association between diabetes and cognitive decline: The National Health and Aging Trends Study.

Arch Gerontol Geriatr 2017 Sep 16;72:39-44. Epub 2017 May 16.

Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, United States; Johns Hopkins Center on Aging and Health, United States; Department of Psychiatry and Behavioral Science, Johns Hopkins School of Medicine, United States.

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http://dx.doi.org/10.1016/j.archger.2017.05.005DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5967846PMC
September 2017

Predicting Acute Compartment Syndrome (PACS): The Role of Continuous Monitoring.

J Orthop Trauma 2017 Apr;31 Suppl 1:S40-S47

*Department of Orthopaedic Surgery, Hennepin County Medical Center, University of Minnesota, Minneapolis, MN; †Department of Orthopaedic Surgery, Carolinas Medical Center, Charlotte, NC; ‡Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; §R Adams Cowley Shock Trauma Center, Department of Orthopaedics, University of Maryland School of Medicine, Baltimore MD; ‖Department of Orthopaedics, San Antonio Military Medical Center, US Army Institute of Surgical Research, San Antonio, TX; ¶Centre for Blast Injury Studies, Imperial College London, London, United Kingdom; and **Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD.

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http://dx.doi.org/10.1097/BOT.0000000000000796DOI Listing
April 2017

Parametrization of white matter manifold-like structures using principal surfaces.

J Am Stat Assoc 2016 18;111(515):1050-1060. Epub 2016 Oct 18.

Department of Biostatistics, Johns Hopkins University, Baltimore, MD, 21205.

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http://dx.doi.org/10.1080/01621459.2016.1164050DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5224707PMC
October 2016

Stride variability measures derived from wrist- and hip-worn accelerometers.

Gait Posture 2017 02 30;52:217-223. Epub 2016 Nov 30.

Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe Street, Baltimore, MD 21205, United States.

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http://dx.doi.org/10.1016/j.gaitpost.2016.11.045DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5337127PMC
February 2017

Association of left atrial epicardial adipose tissue with electrogram bipolar voltage and fractionation: Electrophysiologic substrates for atrial fibrillation.

Heart Rhythm 2016 12 19;13(12):2333-2339. Epub 2016 Aug 19.

Department of Cardiology, The Johns Hopkins University School of Medicine, Baltimore, Maryland; Department of Epidemiology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland; Department of Medicine/Cardiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.

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http://dx.doi.org/10.1016/j.hrthm.2016.08.030DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5115978PMC
December 2016

Blood glucose levels and cortical thinning in cognitively normal, middle-aged adults.

J Neurol Sci 2016 Jun 14;365:89-95. Epub 2016 Apr 14.

Department of Neurology, Johns Hopkins School of Medicine, 733 N. Broadway, Baltimore, MD 21205, United States. Electronic address:

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http://dx.doi.org/10.1016/j.jns.2016.04.017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4876973PMC
June 2016

Association Between Left Atrial Stiffness Index and Atrial Fibrillation Recurrence in Patients Undergoing Left Atrial Ablation.

Circ Arrhythm Electrophysiol 2016 Mar;9(3)

From the Departments of Cardiology (I.M.K., F.M., R.D.B., J.E.M., D.D.S., H.A., D.A.K., H.C., S.N.) and Radiology and Radiological Sciences (S.L.Z.), The Johns Hopkins University School of Medicine, Baltimore, MD; and Departments of Biostatistics (V.Z.) and Epidemiology (S.N.), Johns Hopkins University, Baltimore, MD.

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http://dx.doi.org/10.1161/CIRCEP.115.003163DOI Listing
March 2016

Association of Left Atrial Local Conduction Velocity With Late Gadolinium Enhancement on Cardiac Magnetic Resonance in Patients With Atrial Fibrillation.

Circ Arrhythm Electrophysiol 2016 Mar;9(3):e002897

From the Section of Cardiac Electrophsyiology (K.F., M.H., E.G.I., I.M.K., D.S., H.A., N.T., G.F.T., J.R., J.E.M., R.D.B., H.C., S.N.), Department of Biomedical Engineering (S.Z., H.A., N.T., R.D.B.), Department of Radiology (S.L.Z.), Department of Biostatistics (V.Z.), and Department of Epidemiology (S.N.), Johns Hopkins University, Baltimore, MD.

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http://dx.doi.org/10.1161/CIRCEP.115.002897DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4772170PMC
March 2016

Fast Covariance Estimation for High-dimensional Functional Data.

Stat Comput 2016 Jan 27;26(1):409-421. Epub 2014 Jun 27.

Department of Statistical Science and School of Operations Research and Information Engineering, Cornell University, Ithaca, NY.

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http://dx.doi.org/10.1007/s11222-014-9485-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4758990PMC
January 2016

Rising Energetic Cost of Walking Predicts Gait Speed Decline With Aging.

J Gerontol A Biol Sci Med Sci 2016 07 5;71(7):947-53. Epub 2016 Feb 5.

Longitudinal Studies Section, Translational Gerontology Branch, National Institute on Aging, National Institutes of Health, Baltimore, Maryland.

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http://dx.doi.org/10.1093/gerona/glw002DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4906328PMC
July 2016

Association between Objectively Measured Physical Activity and Mortality in NHANES.

Med Sci Sports Exerc 2016 07;48(7):1303-11

1Population Studies Center, University of Pennsylvania, Philadelphia, PA; 2Division of Education, Maryville College, Maryville, TN; 3Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; 4Department of Social Medicine, Maastricht University, Maastricht, THE NETHERLANDS; 5Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, MD; 6Laboratory of Epidemiology and Population Sciences, National Institute on Aging, Bethesda, MD; 7Faculty of Medicine, University of British Columbia, Vancouver, BC, CANADA.

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http://dx.doi.org/10.1249/MSS.0000000000000885DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4911242PMC
July 2016

Left Atrial LGE and Arrhythmia Recurrence Following Pulmonary Vein Isolation for Paroxysmal and Persistent AF.

JACC Cardiovasc Imaging 2016 Feb 6;9(2):142-8. Epub 2016 Jan 6.

Division of Cardiology, Johns Hopkins University, Baltimore, Maryland; Department of Epidemiology, Johns Hopkins University, Baltimore, Maryland. Electronic address:

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http://dx.doi.org/10.1016/j.jcmg.2015.10.015DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4744105PMC
February 2016

Statistical image analysis of longitudinal RAVENS images.

Front Neurosci 2015 20;9:368. Epub 2015 Oct 20.

Center for Neuroscience and Regenerative Medicine, The Henry M. Jackson Foundation for the Advancement of Military Medicine Bethesda, MD, USA.

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http://dx.doi.org/10.3389/fnins.2015.00368DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4611144PMC
November 2015

Association of left atrial function with incident atypical atrial flutter after atrial fibrillation ablation.

Heart Rhythm 2016 Feb 28;13(2):391-8. Epub 2015 Sep 28.

Departments of Cardiology; Epidemiology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland. Electronic address:

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http://dx.doi.org/10.1016/j.hrthm.2015.09.028DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4724482PMC
February 2016

Electronic devices and applications to track physical activity.

JAMA 2015 May;313(20):2079-80

Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.

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http://dx.doi.org/10.1001/jama.2015.3877DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5323259PMC
May 2015

Association of common variations on chromosome 4q25 and left atrial volume in patients with atrial fibrillation.

Clin Med Insights Cardiol 2015 13;9:39-45. Epub 2015 May 13.

Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD, USA. ; Department of Epidemiology, Johns Hopkins University, Baltimore, MD, USA.

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http://dx.doi.org/10.4137/CMC.S21712DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4431477PMC
May 2015

Association of left atrial function and left atrial enhancement in patients with atrial fibrillation: cardiac magnetic resonance study.

Circ Cardiovasc Imaging 2015 Feb;8(2):e002769

From the Department of Cardiology (M.H., J.A.C.L., I.M.K., K.F., D.S., H.A., J.R., J.E.M., H.C., S.N.), Department of Radiology (S.L.Z.), The Johns Hopkins University School of Medicine, Baltimore, MD; and Department of Biostatistics (V.Z.), Department of Epidemiology (S.N.), The Johns Hopkins Bloomberg School of Public Health, Baltimore, MD.

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http://dx.doi.org/10.1161/CIRCIMAGING.114.002769DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4319560PMC
February 2015

Generalized multilevel function-on-scalar regression and principal component analysis.

Biometrics 2015 Jun 25;71(2):344-53. Epub 2015 Jan 25.

Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, U.S.A.

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http://dx.doi.org/10.1111/biom.12278DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4479975PMC
June 2015

Women Workers and Women at Home Are Equally Inactive: NHANES 2003-2006.

Med Sci Sports Exerc 2015 Aug;47(8):1635-42

1Cancer Prevention Fellowship Program, Division of Cancer Control and Population Sciences, National Cancer Institute, Rockville, MD; 2Laboratory of Epidemiology and Population Sciences, National Institute on Aging, Bethesda, MD; 3Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; 4Department of Kinesiology, University of Wisconsin-Milwaukee, Milwaukee, WI; and 5Center for Aging and Translational Research, University of Wisconsin-Milwaukee, Milwaukee, WI.

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http://dx.doi.org/10.1249/MSS.0000000000000582DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4437973PMC
August 2015

The association of pre-existing left atrial fibrosis with clinical variables in patients referred for catheter ablation of atrial fibrillation.

Clin Med Insights Cardiol 2014 19;8(Suppl 1):25-30. Epub 2014 Oct 19.

Division of Cardiology, Johns Hopkins University, Baltimore, MD. ; Department of Epidemiology, Johns Hopkins University, Baltimore, MD.

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http://dx.doi.org/10.4137/CMC.S15036DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4213197PMC
November 2014

Quantifying the lifetime circadian rhythm of physical activity: a covariate-dependent functional approach.

Biostatistics 2015 Apr 30;16(2):352-67. Epub 2014 Oct 30.

Department of Biostatistics, Johns Hopkins University, Baltimore, MD 21205, USA.

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http://dx.doi.org/10.1093/biostatistics/kxu045DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4804116PMC
April 2015

Structured functional principal component analysis.

Biometrics 2015 Mar 18;71(1):247-257. Epub 2014 Oct 18.

Department of Statistics, Ludwig-Maximilians-Universität München, Munich, Germany.

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http://dx.doi.org/10.1111/biom.12236DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4383722PMC
March 2015

Predicting human movement with multiple accelerometers using movelets.

Med Sci Sports Exerc 2014 Sep;46(9):1859-66

1Department of Biostatistics, The Johns Hopkins University, Baltimore, MD; 2Department of Social Medicine, University of Maastricht, Maastricht, THE NETHERLANDS; 3Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, DENMARK; 4Department of Epidemiology, University of Pittsburgh, Pittsburgh, PA; and 5Laboratory of Epidemiology, Demography, and Biometry, National Institute on Aging, Bethesda, MD.

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http://dx.doi.org/10.1249/MSS.0000000000000285DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4137461PMC
September 2014

Estimating energy expenditure from heart rate in older adults: a case for calibration.

PLoS One 2014 30;9(4):e93520. Epub 2014 Apr 30.

Longitudinal Studies Section, Translational Gerontology Branch, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4005766PMC
January 2015

Radiofrequency ablation versus antiarrhythmic medication for treatment of ventricular premature beats from the right ventricular outflow tract: prospective randomized study.

Circ Arrhythm Electrophysiol 2014 Apr 12;7(2):237-43. Epub 2014 Feb 12.

Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing Cardiac Arrhythmias Therapeutic Service Center, China.

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http://dx.doi.org/10.1161/CIRCEP.113.000805DOI Listing
April 2014

Single nucleotide polymorphisms in proximity to K-channel genes are associated with decreased longitudinal QTc variance.

Ann Noninvasive Electrocardiol 2014 Jan 9;19(1):63-9. Epub 2013 Sep 9.

The Johns Hopkins University School of Medicine, Baltimore, Maryland.

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http://dx.doi.org/10.1111/anec.12088DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4015345PMC
January 2014

Assessing the "physical cliff": detailed quantification of age-related differences in daily patterns of physical activity.

J Gerontol A Biol Sci Med Sci 2014 Aug 14;69(8):973-9. Epub 2013 Dec 14.

Longitudinal Studies Section, Translational Gerontology Branch, National Institute on Aging, National Institutes of Health, Baltimore, Maryland.

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https://academic.oup.com/biomedgerontology/article-lookup/do
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http://dx.doi.org/10.1093/gerona/glt199DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4095926PMC
August 2014

Impact of nonischemic scar features on local ventricular electrograms and scar-related ventricular tachycardia circuits in patients with nonischemic cardiomyopathy.

Circ Arrhythm Electrophysiol 2013 Dec 14;6(6):1139-47. Epub 2013 Nov 14.

Departments of Cardiology, Biostatistics, and Radiology, Johns Hopkins University, Baltimore, MD; and Division of Radiology and Imaging Sciences, NIH Clinical Center, National Institute of Biomedical Imaging and Bioengineering, Bethesda, MD.

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http://dx.doi.org/10.1161/CIRCEP.113.000159DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3884514PMC
December 2013

Normalization and extraction of interpretable metrics from raw accelerometry data.

Biostatistics 2014 Jan 1;15(1):102-16. Epub 2013 Sep 1.

Department of Biostatistics, Johns Hopkins University, Baltimore, MD 21205, USA.

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http://dx.doi.org/10.1093/biostatistics/kxt029DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4072911PMC
January 2014

Functional principal component model for high-dimensional brain imaging.

Neuroimage 2011 Oct 21;58(3):772-84. Epub 2011 Jun 21.

Department of Biostatistics, Johns Hopkins University, Baltimore, MD 21205, USA.

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http://dx.doi.org/10.1016/j.neuroimage.2011.05.085DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3169674PMC
October 2011

Multilevel Functional Principal Component Analysis for High-Dimensional Data.

J Comput Graph Stat 2011;20(4):852-873

Associate Professor, Department of Biostatistics, Johns Hopkins University, Baltimore, MD, 21205.

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http://www.tandfonline.com/doi/abs/10.1198/jcgs.2011.10122
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http://dx.doi.org/10.1198/jcgs.2011.10122DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4425352PMC
January 2011

Population Value Decomposition, a Framework for the Analysis of Image Populations.

J Am Stat Assoc 2011 ;106(495)

Department of Epidemiology, Johns Hopkins University, 615 N. Wolfe St., Baltimore, MD 21205.

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http://dx.doi.org/10.1198/jasa.2011.ap10089DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3886284PMC
January 2011