title: High-frequency heart rate variability during worry predicts stress-related increases in sleep disturbances.
abstract: OBJECTIVE
  The aim of this study was to evaluate whether high-frequency heart rate variability (HF-HRV) during waking restfulness and during worry predicts increases in sleep disturbances in response to a stressful life event.
  
  
  METHODS
  A longitudinal study following up 22 individuals from well-defined periods of lower and higher stress was conducted. HF-HRV during waking restfulness and in response to a worry induction was measured during a low-stress period. Sleep disturbances were assessed using the Pittsburgh Sleep Quality Index (PSQI) and the Insomnia Severity Index (ISI) during low-stress and high-stress periods.
  
  
  RESULTS
  During both the low- and high-stress periods, lower HF-HRV during worry was associated with greater PSQI scores. Importantly, lower HF-HRV during the worry induction prospectively predicted greater increases in the PSQI score from the low-stress to the high-stress periods.
  
  
  CONCLUSIONS
  HF-HRV during worry might represent an index of vulnerability to stress-induced sleep disturbances.
authors.affiliation: Department of Psychology, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; Center for Clinical Research in Health, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; PERFORM Center, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada. Electronic address: jp.gouin@concordia.ca.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Gouin
authors.affiliation: Department of Psychology, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada.
authors.forename: Kerstin
authors.initials: K
authors.lastname: Wenzel
authors.affiliation: PERFORM Center, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; Center for Studies in Behavioral Neurobiology and Department of Exercise Science, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; Centre de Recherche de l'Institut Universitaire de Gériatrie de Montréal, 4545 chemin Queen-Mary, Montréal H3W 1W5, Canada.
authors.forename: Soufiane
authors.initials: S
authors.lastname: Boucetta
authors.affiliation: PERFORM Center, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; Center for Studies in Behavioral Neurobiology and Department of Exercise Science, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; Centre de Recherche de l'Institut Universitaire de Gériatrie de Montréal, 4545 chemin Queen-Mary, Montréal H3W 1W5, Canada.
authors.forename: Jordan
authors.initials: J
authors.lastname: O'Byrne
authors.affiliation: PERFORM Center, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; Center for Studies in Behavioral Neurobiology and Department of Exercise Science, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; Centre de Recherche de l'Institut Universitaire de Gériatrie de Montréal, 4545 chemin Queen-Mary, Montréal H3W 1W5, Canada.
authors.forename: Ali
authors.initials: A
authors.lastname: Salimi
authors.affiliation: Department of Psychology, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; Center for Clinical Research in Health, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; PERFORM Center, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; Center for Studies in Behavioral Neurobiology and Department of Exercise Science, Concordia University, 7141 Sherbrooke St W, Montréal H4B 1R6, Canada; Centre de Recherche de l'Institut Universitaire de Gériatrie de Montréal, 4545 chemin Queen-Mary, Montréal H3W 1W5, Canada.
authors.forename: Thien Thanh
authors.initials: TT
authors.lastname: Dang-Vu
mesh_terms: D000328:Adult; D001007:Anxiety / Q000150:complications / Q000503:physiopathology*; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D017286:Polysomnography; D012893:Sleep Wake Disorders / Q000209:etiology* / Q000503:physiopathology / Q000523:psychology; D013315:Stress, Psychological / Q000150:complications* / Q000503:physiopathology; D011795:Surveys and Questionnaires; D055815:Young Adult
keywords: Autonomic function; Heart rate variability; Insomnia; Stress; Worry