title: [Evaluation of the placebo effect on blood pressure profile during exercise in patients with mild uncomplicated hypertension].
abstract: The administration of placebo (pharmacologically inactive substance) is justified in clinical trials of antihypertensive drugs, in order to avoid the inclusion of placebo-responders. The evaluation of antihypertensive treatments during exercise is an interesting end point, since aerobic exercising is part of antihypertensive treatment. The aims of this study are to determine the placebo impact on blood pressure, heart rate and catecholamine secretion profiles during exercise testing.
  
  
  METHODS
  10 untreated essential mild to moderate hypertensives participated to a single blind study comprising two successive submaximal exercise testings (85% of maximal theoretical heart rate), separated by a single oral administration of placebo. Blood pressure and heart rate were measured after 10 minutes of resting position and at the end of each effort step (2 mm, 20 Watts), both before and after placebo. Blood samples (5 ml) were collected at rest and during maximal exercise before and after placebo, in order to determine the effect of placebo on circulating catecholamines.
  
  
  RESULTS
  there was no significant variations between the "control" and exercise testings after placebo, neither on blood pressure or heart rate profiles, nor in values of circulating catecholamines [Noradrenaline at rest: 1.88 +/- 0.96, exercise: 6.43 +/- 1.93 nm/l before placebo, 1.65 +/- 0.83 nm/l and 5.71 +/- 2.12 nm/l after placebo respectively (NS)].
  
  
  CONCLUSIONS
  the placebo, which effect is generally determined on blood pressure at rest by sphygmomanometry, seems devoid of any activity on blood pressure, heart rate or catecholamine profile during exercise, in essential moderate hypertensives. Thus, antihypertensive treatments at exercise can be evaluated by comparison to baseline cardiovascular parameters without placebo groups.
authors: Laboratoire de pharmacologie expérimentale et clinique, faculté de médecine, Nice.
authors: M D
authors: MD
authors: Drici
authors: M
authors: M
authors: Roux
authors: E
authors: E
authors: Ferrari
authors: P
authors: P
authors: Lapalus
authors: P
authors: P
authors: Morand
mesh_terms: D000328:Adult; D000368:Aged; D001794:Blood Pressure; D002395:Catecholamines / Q000097:blood; D002985:Clinical Protocols; D004311:Double-Blind Method; D005080:Exercise Test; D005260:Female; D006339:Heart Rate; D006801:Humans; D006973:Hypertension / Q000097:blood / Q000453:epidemiology* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D015990:Placebo Effect
chemical_list: D002395:Catecholamines
vernacular_title: Evaluation de l'effet placebo sur le profil tensionnel d'effort de l'hypertendu artériel modéré non compliqué.