title: Interferences between baroreflex and respiration. Evaluation by symbolic analysis and conditional entropy.
abstract: BACKGROUND
  The baroreflex is one of the most important short-term cardiovascular autonomic control mechanisms. Its interactions with other reflexes, mainly cardiopulmonary reflexes, are of paramount importance in controlling heart rate.
  
  
  OBJECTIVE
  This study assesses the coupling between baroreflex and respiration during a progressive bicycle mild dynamical exercise.
  
  
  METHODS
  The coupling was assessed by symbolic analysis and conditional entropy.
  
  
  RESULTS
  Findings suggested the close relationship between the baroreflex sequences and the phase of respiratory signal and, thus, the interference between baroreflex and cardiopulmonary reflexes.
  
  
  CONCLUSIONS
  Indexes describing baroreflex based on spontaneous variability are strongly affected by cardiopulmonary influences.
authors.affiliation: Dipartimento di Bioingegneria, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Vallais
authors.forename: A
authors.initials: A
authors.lastname: Porta
authors.forename: D
authors.initials: D
authors.lastname: Lucini
authors.forename: M
authors.initials: M
authors.lastname: Pagani
authors.forename: F
authors.initials: F
authors.lastname: Aletti
authors.forename: G
authors.initials: G
authors.lastname: Baselli
mesh_terms: D000328:Adult; D017704:Baroreflex / Q000502:physiology*; D001642:Bicycling / Q000502:physiology; D003626:Data Display; D004562:Electrocardiography; D019277:Entropy; D006801:Humans; D010809:Physical Fitness / Q000502:physiology; D010991:Plethysmography; D012016:Reference Values; D012119:Respiration; D012815:Signal Processing, Computer-Assisted; D016683:Supine Position / Q000502:physiology