title: [Heart rate variability in hypertensive patients living in the region of Tyumen Ob].
abstract: OBJECTIVE
  To examine heart rate variability (HRV), some biochemical and echocardiographic indices in hypertensive patients living in the Tyumen Ob region.
  
  
  METHODS
  Registration of HRV, blood count and echocardiography were made in natural conditions of the North in 52 hypertensive patients (36 males, 16 females, age 20-50) living in Tyumen Ob region and 32 healthy controls (19 males, 13 females) matched by age and residence.
  
  
  RESULTS
  Time and spectrum analyses of HRV indices show predominance of the sympathetic link of heart rhythm autonomic regulation in hypertensive patients. Night shifts affect the activity of the sympathetic link of heart rate autonomic regulation destroying its circadian pattern both in hypertensive and normotensive patients.
  
  
  CONCLUSIONS
  Healthy persons initially experience overactivity of the regulatory systems and have the risk for cardiovascular diseases. Working at night shifts accelerates functional exhaustion.
authors: L I
authors: LI
authors: Gapon
authors: T V
authors: TV
authors: Sereda
authors: N N
authors: NN
authors: Korzhova
mesh_terms: D000328:Adult; D002940:Circadian Rhythm / Q000502:physiology*; D003081:Cold Climate / Q000009:adverse effects; D004452:Echocardiography; D015716:Electrocardiography, Ambulatory; D005260:Female; D005500:Follow-Up Studies; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D006973:Hypertension / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009017:Morbidity / Q000639:trends; D012307:Risk Factors; D012426:Russia / Q000453:epidemiology; D055815:Young Adult