title: Influence of acute sleep deprivation on cardiovascular parameters in female Zucker obese and lean rats.
abstract: OBJECTIVE
  There is a reciprocal relationship between sleep duration and weight gain. However, the consequences of this relationship on the cardiovascular system over an entire life span are still not fully elucidated. We examined the effect of acute sleep deprivation (SD) on baroreflex sensitivity and blood pressure in Zucker rats of different ages.
  
  
  METHODS
  Female lean and obese Zucker rats at 3, 6 and 15 months of age were assigned to SD or control (CTRL) groups. After a 6 h period of the SD procedure (6 h of gentle handling) or CTRL procedure (an equivalent period without handling), the animals were anesthetized for surgical catheterization of the femoral artery and vein. To evaluate the baroreflex sensitivity index, bolus infusions of phenylephrine (bradycardia response) and sodium nitroprusside (tachycardia response) were administered.
  
  
  RESULTS
  Obesity resulted in dysfunctional tachycardia responses at 3 months of age. At 6 and 15 months of age, both bradycardia and tachycardia responses were significantly lower in obese animals than those in lean animals. At 15 months of age, interactions among obesity, SD and aging produced the most marked effects on the cardiovascular system (increased mean arterial pressure and heart rate and decreased baroreflex sensitivity).
  
  
  CONCLUSIONS
  Therefore, these results suggest that there is no direct relationship between baroreflex imbalance and an increase in arterial pressure.
authors: Departamento de Psicobiologia, Universidade Federal de Sao Paulo (UNIFESP), Sao Paulo, Brazil.
authors: Neuli M
authors: NM
authors: Tenório
authors: Sergio
authors: S
authors: Tufik
authors: Cássia T
authors: CT
authors: Bergamaschi
authors: Ruy R
authors: RR
authors: Campos
authors: Fátima
authors: F
authors: Cintra
authors: Tathiana A
authors: TA
authors: Alvarenga
authors: Monica L
authors: ML
authors: Andersen
mesh_terms: D000818:Animals; D017704:Baroreflex / Q000187:drug effects / Q000502:physiology; D001794:Blood Pressure / Q000187:drug effects / Q000502:physiology; D001835:Body Weight; D001919:Bradycardia / Q000503:physiopathology; D002319:Cardiovascular System / Q000503:physiopathology*; D005260:Female; D006339:Heart Rate / Q000187:drug effects / Q000502:physiology; D009599:Nitroprusside / Q000494:pharmacology; D009765:Obesity / Q000150:complications / Q000503:physiopathology*; D010656:Phenylephrine / Q000494:pharmacology; D051381:Rats; D011924:Rats, Zucker; D012892:Sleep Deprivation / Q000503:physiopathology*; D013610:Tachycardia / Q000503:physiopathology
chemical_list: D009599:Nitroprusside; D010656:Phenylephrine