High Intensity Interval Versus Continuous Moderate Intensity Training: Maximizing the Benefits of Exercise in Overweight Adolescents (HIIT-MAX)
Metabolism, Physical Fitness

About this trial
This is an interventional prevention trial for Metabolism focused on measuring high intensity interval training, aerobic exercise, insulin sensitivity, obesity, cardiovascular fitness
Eligibility Criteria
Inclusion Criteria:
- Ages 17-22
- Men
- BMI (25.0 - 35.0 kg/m2)
- Interested in improving health and fitness
Exclusion Criteria:
- Weight loss or gain of >10% of body weight in the past 6 months for any reason.
- Currently taking medication that suppresses or stimulates appetite.
- History of prior surgical procedure for weight control or liposuction.
- Current smoker.
Any major disease, including:
- Active cancer or cancer requiring treatment in the past 2 years (except nonmelanoma skin cancer).
- Active or chronic infections, including self-reported HIV positivity and active tuberculosis.
- Diagnosed heart conditions.
- Uncontrolled hypertension: systolic blood pressure 160 mm Hg or diastolic blood pressure 95 mm Hg on treatment.
- Gastrointestinal disease, including self-reported chronic hepatitis or cirrhosis, any episode of alcoholic hepatitis or alcoholic pancreatitis within past year, inflammatory bowel disease requiring treatment in the past year, recent or significant abdominal surgery (e.g., gastrectomy).
- Asthma.
Diagnosed diabetes (type 1 or 2), fasting impaired glucose tolerance (blood glucose 118 mg/dL), or use of any anti-diabetic medications.
- Conditions or behaviors likely to effect the conduct of the trial: unable or unwilling to give informed consent; unable to communicate with the pertinent clinic staff; unwilling to accept treatment assignment by randomization; current or anticipated participation in another intervention research project that would interfere with the intervention offered in the trial; likely to move away from participating clinics before trial completed; unable to walk 0.25 mile in 10 minutes.
- Currently taking antidepressant, steroid, or thyroid medication, unless dosage is stable (no change for 6 months).
- Any active use of illegal or illicit drugs.
- Excessive alcohol intake defined as an average consumption of 3 or more alcohol containing beverages daily.
- Unwilling to limit alcohol intake to ≤2 drink per day (one drink = 4 oz. wine, 12 oz. beer, or ½ shot of liquor).
- Current exerciser (>30 min organized exercise per week).
- Indication of unsuitability of current health for exercise protocol (PARQ).
- Any other conditions which, in opinion of the investigators, would adversely affect the conduct of the trial.
Sites / Locations
- UAB Physiology Lab
Arms of the Study
Arm 1
Arm 2
Experimental
Active Comparator
High Intensity Interval Training
Moderate Intensity Training
Participants will perform the HIIT protocol on an electronically-braked cycle ergometer (Quinton Excalibur, Quinton Instrument Company, Bothell, WA). Participants will perform a 20-minute protocol, consisting of four minutes of cycling at 15% of maximum anaerobic power (Max-AP) followed by 30 seconds at 85% of Max-AP. These workloads will be based upon pre-trial Wingate tests. This cycle was repeated four times within each protocol, ending with two minutes at 15% of Max-AP. This will be performed 3d/wk for 6wks, with at least 24 hrs between each session.
Participants will perform 45-60 min (graduated over time to 60) of continuous cycling at 65% of VO¬2peak on a Monark cycle ergometer. Workload will be based upon pre-trial VO¬2peak testing. MIT exercise will be performed 5d/wk for 6wks.