Effects of aerobic exercise training on variability and heart rate kinetic during submaximal exercise after gastric bypass surgery--a randomized controlled trial.
BACKGROUND
This study aimed to determine whether morbidly obese women have an alteration of heart rate (HR) kinetics and HR variability (HRV) during the 6-min walk test (6MWT) and if an aerobic exercise training can modify these indexes after gastric bypass surgery (GBS).


METHODS
Nineteen morbidly obese women were randomized to a trained (TG) or control group and 12 women of eutrophic group (EG) were also evaluated. The obese women were tested on two occasions: 1 week before and 4 months after GBS through record of HR and R-R intervals during 6MWT for analysis HR kinetics. The TG underwent an aerobic exercise training program on a treadmill (1-h session, totaling 36 sessions over 12-week).


RESULTS
Both obese groups demonstrated a significant reduction of rMSSD and slower HR kinetics during the 6MWT when compared to the EG. In addition, only the TG demonstrated a significant improvement in HRV indexes, walking distance, faster time constant and mean response time of HR during 6MWT after training (p < 0.05).


CONCLUSIONS
Morbidly obese women have slower HR kinetics and altered cardiac modulation during submaximal exercise. However, aerobic exercise training can produce beneficial adaptations in HRV and faster HR kinetics following GBS.
Cardiopulmonary Physiotherapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of São Carlos, São Carlos, São Paulo, Brazil. vivica_castello@yahoo.com.br
Viviane
V
Castello-Simões
Rodrigo
R
Polaquini Simões
Thomas
T
Beltrame
Daniela
D
Bassi
Aparecida
A
Maria Catai
Ross
R
Arena
Noé Carvalho
NC
Azambuja
João
J
do Nascimento Ortega
Audrey
A
Borghi-Silva
D000328:Adult; D000704:Analysis of Variance; D001341:Autonomic Nervous System / Q000503:physiopathology; D015992:Body Mass Index; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005081:Exercise Therapy / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D015390:Gastric Bypass; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D009767:Obesity, Morbid / Q000601:surgery*; D010101:Oxygen Consumption; D010809:Physical Fitness / Q000502:physiology*; D011446:Prospective Studies; D012307:Risk Factors; D013147:Spirometry; D016896:Treatment Outcome; D016138:Walking