title: Testosterone and cardiac mass and function in men with type 1 diabetes in the Epidemiology of Diabetes Interventions and Complications Study (EDIC).
abstract: OBJECTIVE
  Low testosterone concentrations have been reported to be associated with increased risk of congestive heart failure, but the mechanisms are unclear. Our objective was to examine the relationship between endogenous testosterone and measures of cardiac mass and function among men with type 1 diabetes.
  
  
  METHODS
  Secondary analysis of a prospective observational study.
  
  
  METHODS
  Men (n = 508) in the Epidemiology of Diabetes Interventions and Complications (EDIC) study, the observational follow-up of the Diabetes Control and Complications Trial (DCCT).
  
  
  METHODS
  Testosterone assessed by liquid chromatography mass spectrometry at EDIC year 10 and cardiac magnetic resonance imaging (CMR) measures at EDIC years 14/15. Linear regression models were used to assess the relationship between testosterone, sex hormone binding globulin (SHBG) and left ventricular (LV) mass, volume, ejection fraction and cardiac index before and after adjustment for age, randomization arm, alcohol and cigarette use, macroalbuminuria, haemoglobin A1c, insulin dose, body mass index, lipids, blood pressure, use of antihypertensive medications and microvascular complications.
  
  
  RESULTS
  In fully adjusted models, total testosterone concentrations were significantly associated with LV mass (P = 0·014), end-diastolic volume (P = 0·002), end-systolic volume (P = 0·012) and stroke volume (P = 0·022), but not measures of LV function after adjustment for cardiac risk factors. Bioavailable testosterone was associated with LV mass, but not volume or function, while SHBG was associated with volume, but not mass or function.
  
  
  CONCLUSIONS
  Among men with type 1 diabetes, higher total testosterone was associated with higher LV mass and volume, but not with function. The clinical significance of this association remains to be established.
authors.affiliation: Departments of Medicine, Obstetrics & Gynecology and Epidemiology, University of Michigan, Ann Arbor, MI, USA.
authors.forename: Catherine
authors.initials: C
authors.lastname: Kim
authors.affiliation: The Biostatistics Center, George Washington University, Rockville, MD, USA.
authors.forename: Ionut
authors.initials: I
authors.lastname: Bebu
authors.affiliation: The Biostatistics Center, George Washington University, Rockville, MD, USA.
authors.forename: Barbara
authors.initials: B
authors.lastname: Braffett
authors.affiliation: The Biostatistics Center, George Washington University, Rockville, MD, USA.
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Cleary
authors.affiliation: Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, USA.
authors.forename: Valerie
authors.initials: V
authors.lastname: Arends
authors.affiliation: Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, USA.
authors.forename: Michael
authors.initials: M
authors.lastname: Steffes
authors.affiliation: Department of Urology, University of Washington, Seattle, WA, USA.
authors.forename: Hunter
authors.initials: H
authors.lastname: Wessells
authors.affiliation: Department of Epidemiology, University of Pittsburgh, Pittsburgh, PA, USA.
authors.forename: Trevor
authors.initials: T
authors.lastname: Orchard
authors.affiliation: Department of Urology, University of Michigan, Ann Arbor, MI, USA.
authors.forename: Aruna V
authors.initials: AV
authors.lastname: Sarma
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D008875:Middle Aged; D048909:Diabetes Complications / Q000097:blood / Q000503:physiopathology; D003922:Diabetes Mellitus, Type 1 / Q000097:blood / Q000453:epidemiology / Q000628:therapy; D006321:Heart / Q000503:physiopathology; D006352:Heart Ventricles / Q000473:pathology / Q000503:physiopathology; D008279:Magnetic Resonance Imaging; D009206:Myocardium / Q000473:pathology; D011446:Prospective Studies; D012307:Risk Factors; D012738:Sex Hormone-Binding Globulin / Q000032:analysis; D013739:Testosterone / Q000097:blood; D018487:Ventricular Dysfunction, Left / Q000097:blood / Q000000981:diagnostic imaging; D000094422:Secondary Data Analysis
chemical_list: D012738:Sex Hormone-Binding Globulin; D013739:Testosterone