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NCT Number: NCT02185872

CrossFit Exercise to Improve Glucose Control for Overweight and Obese Adults

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.

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Key information

Conditions

Hyperglycemia Behavior Glucocorticoid Receptor Deficiency Glucose Metabolism Disorders Metabolic Diseases Motor Activity Nutritional and Metabolic Diseases

Age range

18 year–40 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Kansas State University

Manhattan, Kansas, 66506, United States

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • body mass index (BMI) of 25 - < 40, physically inactive (i.e., not participating in any structured exercise programs for the past 2 months and not exceeding 30 total minutes of physical activity per week)

Exclusion criteria

  • current smoker, pregnant, taking blood glucose altering medications, heart disease, type 1 or 2 diabetes mellitus, total cholesterol 200 mg/dL or higher

Treatment and study plan

High-Intensity Functional Training

Other

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.

Other names: CrossFit

Aerobic and Resistance Training

Other

The protocol was based upon current guidelines of 150 minutes moderate-intensity aerobic activity and 2 days of muscle strengthening per week.

Primary outcomes

  1. Change from baseline in glucose control.

    Time frame: Baseline, Week 10

    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)]

Secondary outcomes

  1. Change from baseline in peak aerobic capacity

    Time frame: Baseline, Week 10

    Modified Balke protocol

  2. Change from baseline in sit and reach

    Time frame: Baseline, Week 10

    Eurofit protocol for sit and reach distance using flex tester box

  3. Change from baseline in standing broad jump

    Time frame: Baseline, Week 10

    Eurofit protocol

  4. Change from baseline in vertical jump

    Time frame: Baseline, Week 10

    Eurofit protocol

  5. Change from baseline in pushups

    Time frame: Baseline, Week 10

    Eurofit protocol; completed on feet or knees

  6. Change from baseline in situps

    Time frame: Baseline, Week 10

    Eurofit protocol

  7. Change from baseline in 40 meter dash

    Time frame: Baseline, Week 10

    A handheld stopwatch was used to record time from the command "Go" until the participant crossed the line at 40 meters

  8. Change from baseline in stork balance test

    Time frame: Baseline, Week 10

  9. Change from baseline in body composition

    Time frame: Baseline, Week 12

    Dual X-ray absorptiometry scan was used to assess body fat percentage, lean body mass, and fat mass.

Other outcomes

  1. Time spent completing daily workouts

    Time frame: 24 exercise sessions over 8 weeks

    Time spent to complete each assigned daily workout was individually recorded for each participant

Sponsors and collaborators

Lead sponsor

Kansas State University

Other

Registry information

Official study title

The Influence of a CrossFit Exercise Program on Glucose Control in Overweight and Obese Individuals

Important dates

Study start
2012
Primary completion
2012
Study completion
2012
First posted
Jul 10, 2014
Registry last updated
Mar 31, 2015

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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