title: Autonomic function responses to training: Correlation with body composition changes.
abstract: OBJECTIVE
  The causal relation between autonomic function and adiposity is an unresolved issue. Thus, we studied whether resting heart rate variability (HRV) changes could be used to predict changes in body composition after 16 weeks of individualized exercise training.
  
  
  METHODS
  A total of 117 sedentary overweight/obese adults volunteered to join an intervention group (IN, n=82) or a control group (CON, n=35). The intervention group trained for 30-40 min three times a week with an intensity of 85-100% of individual ventilatory threshold (Thvent). At baseline and after a 16-week training period, resting HRV variables, body composition and peak oxygen uptake (VO2peak) were assessed.
  
  
  RESULTS
  Compared with CON, exercise training significantly improved HRV and body composition and increased VO2peak (P<0.05). Significant correlations were observed between changes of HRV variables and body composition indices and VO2peak (P<0.05). Greater individual changes in HRV in response to exercise training were observed for those with greater total and central fat loss.
  
  
  CONCLUSIONS
  Individual aerobic-based exercise training was for improving autonomic function and resting HRV responses to aerobic training is a potential indicator for adaptations to exercise training.
authors.affiliation: China Institute of Sport Science, Beijing, China. Electronic address: tianye@ciss.cn.
authors.forename: Ye
authors.initials: Y
authors.lastname: Tian
authors.affiliation: Department of Sports Science, Shandong University of Sport, Shandong, China.
authors.forename: Chuanye
authors.initials: C
authors.lastname: Huang
authors.affiliation: China Institute of Sport Science, Beijing, China.
authors.forename: Zihong
authors.initials: Z
authors.lastname: He
authors.affiliation: China Institute of Sport Science, Beijing, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Hong
authors.affiliation: China Institute of Sport Science, Beijing, China.
authors.forename: Jiexiu
authors.initials: J
authors.lastname: Zhao
mesh_terms: D000328:Adult; D001823:Body Composition / Q000502:physiology*; D015444:Exercise / Q000502:physiology; D005081:Exercise Therapy / Q000379:methods; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000503:physiopathology* / Q000628:therapy*; D010101:Oxygen Consumption / Q000502:physiology; D010809:Physical Fitness / Q000502:physiology*; D012146:Rest; D016896:Treatment Outcome; D015431:Weight Loss / Q000502:physiology; D055815:Young Adult
keywords: Body composition; Heart rate variability; Peak oxygen uptake