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High-intensity Intermittent Training for Obese Individuals

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ClinicalTrials.gov Identifier: NCT01143376
Recruitment Status : Completed
First Posted : June 14, 2010
Last Update Posted : April 20, 2017
Sponsor:
Collaborator:
Helse Midt-Norge
Information provided by (Responsible Party):
Norwegian University of Science and Technology

Brief Summary:

The most appropriate and effective exercise interventions for weight loss remain a matter of continued discussion and there is a need to identify sustainable exercise programs which successfully promote weight loss and benefit health.

The primary objective of this study is to determine if high-intensity intermittent sprinting (HIIS) produces better results in terms of reducing metabolic and cardiovascular risk factors, with special emphasis to fat mass loss and insulin sensitivity in "healthy" obese volunteers compared with an iso-caloric program of moderate-intensity continuous cycling (MICC) (control condition following the international recommendations). We will also assess the impact of short duration sprints (SDS) in the above factors and to understand the potential mechanisms behind different outcomes among training programs.

The overall hypothesis is that HIIS will lead to a greater reduction in metabolic and cardiovascular risk factors compared with MICC in healthy obese volunteers and that SDS will produce similar improvements in cardiovascular risk factors as the longer duration HIIS


Condition or disease Intervention/treatment Phase
Obesity Behavioral: High intensity training Behavioral: short springs Behavioral: Moderate intensity exercise Not Applicable

Detailed Description:

Participants will be randomized to one of three groups: HIIS (8s sprint:12s rest) or MICC (control group) iso-caloric protocols (for the duration needed to induce a 250 kcal energy deficit) or SDS (8s sprint:12s rest) for 10 minutes for 12 weeks. The intervention groups will be matched for age, BMI and male/females ratio and participants will be asked not to change their normal diet throughout the study.

Before and after the exercise intervention (12 weeks), participants will perform the following assessments:

  1. Three-day food diaries
  2. Anthropometric measurements (weight, height, waist and hips) using standard procedures;
  3. Body composition using dual energy x-ray absorptiometry (DEXA)
  4. RMR and resting respiratory exchange ratio (RER) using indirect calorimetry;
  5. Endothelial function assessed by flow-mediated dilation (FMD) of the brachial artery using vascular ultrasound according to current guidelines;
  6. Maximal oxygen uptake (VO2max) and fat oxidation, cardiac output and left ventricular function during exercise using a cycle ergometer;
  7. Muscle and fat biopsies
  8. Fasting and postprandial release of appetite related hormones (and subjective feelings of hunger/fullness using visual analogue scales - VAS).

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 46 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: High-intensity Intermittent Training to Maximize Metabolic and Cardiovascular Protection in Obese Individuals
Study Start Date : May 2010
Actual Primary Completion Date : December 2012
Actual Study Completion Date : January 2014

Arm Intervention/treatment
Active Comparator: Moderate intensity exercise
Moderate intensity exercise
Behavioral: Moderate intensity exercise
Experimental: High Intensity training
High Intensity intermittent training
Behavioral: High intensity training
high-intensity intermittent sprinting (HIIS) (8 sec sprint:12 sec rest) for 12 weeks, 4 times a week

Experimental: Short springs
short springs training
Behavioral: short springs
short duration sprints (SDS)(8 sec sprint:12 sec rest) for 12 weeks, 4 times a week




Primary Outcome Measures :
  1. Changes in body composition [ Time Frame: Baseline and after 12 weeks of training ]
    Body composition assessed by DEXA


Secondary Outcome Measures :
  1. Changes in insulin sensitivity [ Time Frame: Baseline and after 12 weeks of training ]
    Insulin will be measured in fasting and for 3h after a test meal



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Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • weight stable on the last three months,
  • not currently dieting to lose weight
  • inactive lifestyle.

Exclusion Criteria:

  • History of endocrine/cardiovascular/pulmonary/kidney disease,
  • anaemia,
  • gout,
  • depression or other psychological disorders,
  • eating disorders,
  • drug or alcohol abuse within the last two years
  • current medication known to affect appetite or induce weight loss.
  • planned surgery during the study period
  • participation in another research study
  • restraint score derived from the TFEQ>12
  • post-menopausal women

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01143376


Locations
Norway
Norwegian University of Science and Technology
Trondheim, Norway, 7489
Sponsors and Collaborators
Norwegian University of Science and Technology
Helse Midt-Norge
Investigators
Principal Investigator: Catia Martins, PhD Norwegian University of Science and Technology