The purpose of this study was to examine the differences in glucose control, fitness, and body composition between a standard aerobic and resistance exercise training program and a shorter-duration, high-intensity CrossFit training program in overweight and obese physically inactive adults. Hypotheses: 1. Both groups would improve glucose control, with the CrossFit group improving significantly more than the aerobic and resistance training group. 2. Both groups would improve fitness, with the CrossFit group improving significantly more than the aerobic and resistance training group. 3. Both groups would demonstrate decreases in body fat percentage and fat mass and increases in lean body mass, with the CrossFit group improving significantly more than the aerobic and resistance training group.
Overweight or obese participants will take part in an 8-week exercise intervention after clearance from a doctor, that is expected to improve glucose control, fitness (Eurofit and peak aerobic capacity), and body composition (body fat percentage, fat mass, and lean body mass). After stratification by age and body mass index, participants will be randomized to either a standard aerobic and resistance training exercise program or a relatively higher intensity, shorter duration CrossFit exercise program.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
23
Participants were instructed to work as hard as they could while maintaining safe technique and proper form to achieve as many reps or rounds as possible in the prescribed time frame. As HIFT participants became accustomed to specific movements, less time was dedicated to practicing movements and technique.
The protocol was based upon current guidelines of 150 minutes moderate-intensity aerobic activity and 2 days of muscle strengthening per week.
Kansas State University
Manhattan, Kansas, United States
Change from baseline in glucose control.
Fasting plasma glucose levels were taken after an overnight fast of at least 8 hours. An oral glucose tolerance test was conducted after ingestion of a 75g oral dextrose solution with finger sticks at 30, 45, and 60 minutes from time 0. The following equation was used to calculate glucose area under the curve which was the metric utilized to ascertain changes in glucose control: \[(Time 45 - Time 30) \* ½ (OGTT 30 + OGTT 45)\] + \[(Time 60 - Time 45) \* ½ (OGTT 60 + OGTT 45)\]
Time frame: Baseline, Week 10
Change from baseline in peak aerobic capacity
Modified Balke protocol
Time frame: Baseline, Week 10
Change from baseline in sit and reach
Eurofit protocol for sit and reach distance using flex tester box
Time frame: Baseline, Week 10
Change from baseline in standing broad jump
Eurofit protocol
Time frame: Baseline, Week 10
Change from baseline in vertical jump
Eurofit protocol
Time frame: Baseline, Week 10
Change from baseline in pushups
Eurofit protocol; completed on feet or knees
Time frame: Baseline, Week 10
Change from baseline in situps
Eurofit protocol
Time frame: Baseline, Week 10
Change from baseline in 40 meter dash
A handheld stopwatch was used to record time from the command "Go" until the participant crossed the line at 40 meters
Time frame: Baseline, Week 10
Change from baseline in stork balance test
Time frame: Baseline, Week 10
Change from baseline in body composition
Dual X-ray absorptiometry scan was used to assess body fat percentage, lean body mass, and fat mass.
Time frame: Baseline, Week 12
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