title: Physical training associated with Enalapril but not to Losartan, results in better cardiovascular autonomic effects.
abstract: We investigated the cardiovascular autonomic effects of physical training associated with Enalapril or Losartan pharmacological treatments in spontaneously hypertensive rats (SHR).
  
  
  
  SHRs, 18weeks of age (N=48) was assigned to either sedentary (N=24) and trained (N=24; aerobic training by swimming for 10wk). Each group was subdivided in 3 subgroups (N=8) vehicle (control); Enalapril (10mg·kg-1·d-1); and Losartan (5mg·kg-1·d-1). All animals received a 10-week treatment in drinking water. In the last week of the treatments, the animals had their femoral artery and vein cannulated for blood pressure recording and drug injection, respectively. The autonomic assessment was performed by means of different approaches: double cardiac autonomic block with atropine and propranolol, spectral analysis of heart rate variability (HRV) and systolic arterial pressure (SAPV) and assessment of baroreflex sensitivity (BRS).
  
  
  
  The groups treated with Enalapril, sedentary and trained, showed more significant decrease in blood pressure when compared to the other groups. Autonomic evaluation showed that the sedentary group treated with Enalapril or Losartan had similar results, characterized by decreased effect of sympathetic tone and/or increased effect of cardiac vagal tone associated with improved BRS. Isolated physical training attenuated only the effect of sympathetic tone. The association of physical training with Enalapril showed the best results, characterized by the predominance of vagal tone in cardiac autonomic balance, increased HRV, reduced SAPV and increased BRS.
  
  
  
  Enalapril and Losartan promoted similar beneficial cardiovascular autonomic effects in sedentary animals, while only the association of physical training with Enalapril potentiated these effects.
authors.affiliation: Exercise Physiology Laboratory, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Karina Delgado
authors.initials: KD
authors.lastname: Maida
authors.affiliation: Exercise Physiology Laboratory, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Ada Clarice
authors.initials: AC
authors.lastname: Gastaldi
authors.affiliation: Exercise Physiology Laboratory, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Tabata
authors.initials: T
authors.lastname: de Paula Facioli
authors.affiliation: Exercise Physiology Laboratory, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: João Eduardo
authors.initials: JE
authors.lastname: de Araújo
authors.affiliation: Exercise Physiology Laboratory, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil. Electronic address: hugocds@fmrp.usp.br.
authors.forename: Hugo Celso Dutra
authors.initials: HC
authors.lastname: de Souza
mesh_terms: D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology*; D001285:Atropine / Q000494:pharmacology; D001341:Autonomic Nervous System / Q000187:drug effects* / Q000503:physiopathology; D017704:Baroreflex / Q000187:drug effects / Q000502:physiology; D001794:Blood Pressure / Q000187:drug effects / Q000502:physiology; D003131:Combined Modality Therapy; D004195:Disease Models, Animal; D004656:Enalapril / Q000494:pharmacology*; D005081:Exercise Therapy; D006339:Heart Rate / Q000187:drug effects / Q000502:physiology; D006973:Hypertension / Q000503:physiopathology / Q000628:therapy*; D019808:Losartan / Q000494:pharmacology*; D008297:Male; D010276:Parasympatholytics / Q000494:pharmacology; D011433:Propranolol / Q000494:pharmacology; D011918:Rats, Inbred SHR; D057185:Sedentary Behavior; D013550:Swimming / Q000502:physiology*
chemical_list: D000959:Antihypertensive Agents; D010276:Parasympatholytics; D004656:Enalapril; D001285:Atropine; D011433:Propranolol; D019808:Losartan
keywords: Autonomic nervous system; Enalapril; Exercise; Hypertension; Losartan