Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
NA
138 participants
INTERVENTIONAL
2015-10-28
2020-06-28
Brief Summary
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Detailed Description
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In our CRCT, we aim to recruit and randomize approximately 150 soldiers (n=15 clusters-staff groups/platoons-per condition with at least 5 soldiers nested within each cluster) comparing the effectiveness of HIFT versus usual care (APRT) on:
Specific Aim 1 - changes in body composition including: percent body fat (%BF), fat mass, fat free mass, and body weight.
We hypothesize that soldiers in the HIFT condition will be significantly more likely to decrease a. %BF and b. fat mass, and to increase c. fat free mass than those in the APRT condition; we expect both groups to d. maintain body weight.
Specific Aim 2 - changes in fitness (e.g., APFT, power, strength), while accounting for actual physical training time in each condition.
We hypothesize that soldiers in the HIFT condition will have significantly greater improvement in their performance on fitness tests when compared to those in APRT, despite significantly less total training time. These outcomes will help determine if functional-oriented training can result in better fitness and combat preparedness for Army personnel.
Conditions
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Keywords
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Study Design
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RANDOMIZED
PARALLEL
PREVENTION
SINGLE
Study Groups
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High-Intensity Functional Training
CrossFit will be the HIFT intervention framework with training elements, exercise programming, and scheduling set by CrossFit staff. Workouts will be comprised of one or more of three exercise modalities: aerobic/monostructural (e.g., running), gymnastics (e.g., pullups), and weightlifting/resistance training with workouts designed to maximize use of equipment available in deployed environments (e.g.,vehicle tires). All workouts will be individually scaled to each soldier's current level of fitness by a certified trainer. Sessions will be standardized across the 6 months of intervention so that each cluster will receive exactly the same training.
High-Intensity Functional Training
Constantly varied functional movements performed at a high intensity and incorporating monostructural (aerobic), gymnastics (body weight) and/or weightlifting movements. CrossFit is a good model of HIFT for the military because of its emphasis on general physical preparedness and functional movements and because it is open source and programming is available at no cost (see www.crossfit.com). Sixty-minute HIFT sessions will include a warm-up, workout and cool down. Workouts will average 15 minutes in duration (range = 5-45 minutes) for a total of 50-100 minutes per week.
Army Physical Readiness Training
The APRT program has combat readiness as the primary focus and is mandated for active duty personnel. For this study, APRT sessions have been standardized across the 6 months of the intervention according to FM 7-22 "Army Physical Readiness Training" manual so each cluster will receive the same training program using the Reset Phase. Sessions will consist of preparation, activities and recovery and will include strength, endurance, and mobility exercises that involve on-ground (e.g., running), off-ground (e.g., climbing), and combatives (e.g., striking and grappling) training, with supervision by a certified trainer.
Army Physical Readiness Training
Usual physical training program for Army personnel from directive FM 7-22, using the Reset phase. Exercises will address strength, endurance, and mobility training. APRT is designed to be completed in 60-90 minute sessions, 5 days/week for a total dose of 300-450 minutes per week.
Interventions
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High-Intensity Functional Training
Constantly varied functional movements performed at a high intensity and incorporating monostructural (aerobic), gymnastics (body weight) and/or weightlifting movements. CrossFit is a good model of HIFT for the military because of its emphasis on general physical preparedness and functional movements and because it is open source and programming is available at no cost (see www.crossfit.com). Sixty-minute HIFT sessions will include a warm-up, workout and cool down. Workouts will average 15 minutes in duration (range = 5-45 minutes) for a total of 50-100 minutes per week.
Army Physical Readiness Training
Usual physical training program for Army personnel from directive FM 7-22, using the Reset phase. Exercises will address strength, endurance, and mobility training. APRT is designed to be completed in 60-90 minute sessions, 5 days/week for a total dose of 300-450 minutes per week.
Other Intervention Names
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Eligibility Criteria
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Inclusion Criteria
* willingness to adhere to study protocol and complete all study assessments; and
* high likelihood of assignment to the military post over the 8 (+/-) 1-month course of the study.
Exclusion Criteria
* having a pacemaker or other implanted/internal electrical device;
* currently on administrative leave or assigned to exclusively administrative duties; and
* (if female) pregnant or lactating, or planning to become pregnant in the next 9-months.
18 Years
64 Years
ALL
Yes
Sponsors
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National Development and Research Institutes, Inc.
OTHER
Kansas State University
OTHER
Responsible Party
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Katie M. Heinrich
Associate Professor
Principal Investigators
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Katie M Heinrich, PhD
Role: PRINCIPAL_INVESTIGATOR
Kansas State University
Walker SC Poston, PhD, MPH
Role: PRINCIPAL_INVESTIGATOR
National Develop and Research Institutes
Locations
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Fort Leavenworth
Leavenworth, Kansas, United States
Kansas State University
Manhattan, Kansas, United States
Countries
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References
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Poston WS, Haddock CK, Heinrich KM, Jahnke SA, Jitnarin N, Batchelor DB. Is High-Intensity Functional Training (HIFT)/CrossFit Safe for Military Fitness Training? Mil Med. 2016 Jul;181(7):627-37. doi: 10.7205/MILMED-D-15-00273.
Haddock CK, Poston WS, Heinrich KM, Jahnke SA, Jitnarin N. The Benefits of High-Intensity Functional Training Fitness Programs for Military Personnel. Mil Med. 2016 Nov;181(11):e1508-e1514. doi: 10.7205/MILMED-D-15-00503.
Poston WS, Haddock CK, Heinrich KM, Jahnke SA, Jitnarin N, Batchelor DB, Feito Y, Suminski RR. Response: Is High-Intensity Functional Training (HIFT)/CrossFit Safe for Military Fitness Training? Mil Med. 2017 Jan;182(1):1476-1479. doi: 10.7205/MILMED-D-16-00369. No abstract available.
Feito Y, Heinrich KM, Butcher SJ, Poston WSC. High-Intensity Functional Training (HIFT): Definition and Research Implications for Improved Fitness. Sports (Basel). 2018 Aug 7;6(3):76. doi: 10.3390/sports6030076.
Other Identifiers
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