title: High-Intensity Interval Training and Isocaloric Moderate-Intensity Continuous Training Result in Similar Improvements in Body Composition and Fitness in Obese Individuals.
abstract: This study aimed to determine the effects of 12 weeks of isocaloric programs of high-intensity intermittent training (HIIT) or moderate-intensity continuous training (MICT) or a short-duration HIIT (1/2HIIT) inducing only half the energy deficit on a cycle ergometer, on body weight and composition, cardiovascular fitness, resting metabolism rate (RMR), respiratory exchange ratio (RER), nonexercise physical activity (PA) levels and fasting and postprandial insulin response in sedentary obese individuals. Forty-six sedentary obese individuals (30 women), with a mean BMI of 33.3 ± 2.9 kg/m2 and a mean age of 34.4 ± 8.8 years were randomly assigned to one of the three training groups: HIIT (n = 16), MICT (n = 14) or 1/2HIIT (n = 16) and exercise was performed 3 times/week for 12 weeks. Overall, there was a significant reduction in body weight, waist (p < .001) and hip (p < .01) circumference,, trunk and leg fat mass (FM; p < .01) and an increase in trunk and leg fat free mass (FFM; p < .01) and cardiovascular fitness (VO2max in ml/kg/min; p < .001) with exercise. However, no significant differences were observed between groups. There was no significant change in RMR, RER, nonexercise PA levels, fasting insulin or insulin sensitivity with exercise or between groups. There was a tendency for a reduction in AUC insulin with exercise (p = .069), but no differences between groups. These results indicate that isocaloric training protocols of HIIT or MICT (or 1/2HIIT inducing only half the energy deficit) exert similar metabolic and cardiovascular improvements in sedentary obese individuals.
authors.affiliation: Obesity Research Group, Dept. of Cancer Research and Molecular Medicine, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway.
authors.forename: Catia
authors.initials: C
authors.lastname: Martins
authors.forename: Irina
authors.initials: I
authors.lastname: Kazakova
authors.forename: Marit
authors.initials: M
authors.lastname: Ludviksen
authors.forename: Ingar
authors.initials: I
authors.lastname: Mehus
authors.forename: Ulrik
authors.initials: U
authors.lastname: Wisloff
authors.forename: Bard
authors.initials: B
authors.lastname: Kulseng
authors.forename: Linda
authors.initials: L
authors.lastname: Morgan
authors.forename: Neil
authors.initials: N
authors.lastname: King
mesh_terms: D000328:Adult; D001481:Basal Metabolism; D001786:Blood Glucose / Q000378:metabolism; D001823:Body Composition; D015992:Body Mass Index; D001835:Body Weight; D002318:Cardiovascular Diseases / Q000517:prevention & control; D002319:Cardiovascular System / Q000378:metabolism; D004032:Diet; D015444:Exercise; D005260:Female; D006339:Heart Rate; D000072696:High-Intensity Interval Training; D006801:Humans; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D008297:Male; D024821:Metabolic Syndrome / Q000517:prevention & control; D009765:Obesity / Q000628:therapy*; D010101:Oxygen Consumption; D064797:Physical Conditioning, Human / Q000379:methods*; D010809:Physical Fitness / Q000502:physiology*; D057185:Sedentary Behavior
chemical_list: D001786:Blood Glucose; D007328:Insulin