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Failure to recruit
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The purpose of this study is to compare the physical fitness performance-as measured by the Air Force Physical Fitness Test (PFT)-of subjects that, in conjunction with exercise, will take creatine supplementation over a four week period versus those that do not.
The purpose of this study is to compare the physical fitness performance-as measured by the Air Force Physical Fitness Test (PFT)-of subjects that, in conjunction with exercise, will take creatine supplementation over a four week period versus those that do not. Based on the literature, there is evidence to support that creatine supplementation may increase available levels of muscle phosphocreatine (PCr), an important energy reservoir that is initially expended with intense muscular contraction and then regenerated during episodes of rest. While mechanistically plausible, the effects of creatine on the specific measures of the PFT (push-ups, sit-ups, 1.5 mile run, and abdominal circumference) have not been evaluated. The target population is Active Duty Air Force (ADAF) service members who perform perform the PFT. As such, this represents a population with occupational requirements to maintain their fitness at a designated level. If short-term creatine supplementation does help to improve PFT scores, trainers, commanders, and unit physicians may wish to consider recommending its use. While generally considered safe, additional data will also be collected to evaluate both the qualitative and quantitative side-effects of creatine supplementation over the study period. If the hypothesis is correct and creatine supplementation is shown to be both effective and safe, additional studies may be warranted to evaluate its impact on ADAF service members who have failed the PFT and/or are at risk of being separated from the AF for unsatisfactory fitness performance. In short, this study has the potential to dramatically affect the recommendations and practices of ADAF service members related to use of creatine supplementation.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Placebo | Placebo Comparator | 30g white rice flour |
|
| Low dose | Experimental | 5g/day Creatine Monohydrate (25g white rice flour) for 28 days |
|
| Loading dose | Experimental | Creatine Monohydrate 20g/day (10g white rice flour) for 7 days, followed by maintenance dose of Creatine Monohydrate 5g/day (25g white rice flour) for the remaining 21 days |
|
| High dose | Experimental | High dose of Creatine Monohydrate 20g/day (10g white rice flour) for the entire 28 day period |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Creatine Monohydrate | Dietary Supplement | Creatine monohydrate is a very common supplement used by enthusiasts, athletes, and the general populace |
|
| Measure | Description | Time Frame |
|---|---|---|
| Determine the effect of creatine supplementation on anaerobic performance in the PFT by measuring change in repetitions of push-ups and sit-ups. | An initial mock AF PFT will be administered. Individual component raw numbers, scores, and composite scores will be recorded. Participants will self-take their prescribed regimen twice a day, in addition to exercise 5 days/week. Within 7 days of completing the prescribed treatment and exercise course, participants will undergo another mock AF PFT. The individual component raw numbers, scores, and composite scores will be recorded and compared to initial mock scores | 28 days |
| Determine the effect of creatine supplementation on aerobic performance in the PFT by measuring change in 1.5 mile run time. | An initial mock AF PFT will be administered. Individual component raw numbers, scores, and composite scores will be recorded. Participants will self-take their prescribed regimen twice a day, in addition to exercise 5 days/week. Within 7 days of completing the prescribed treatment and exercise course, participants will undergo another mock AF PFT. The individual component raw numbers, scores, and composite scores will be recorded and compared to initial mock scores | 28 days |
| Determine the effect of creatine supplementation on body composition as it relates to the PFT by measuring change in abdominal circumference | An initial mock AF PFT will be administered. Individual component raw numbers, scores, and composite scores will be recorded. Participants will self-take their prescribed regimen twice a day, in addition to exercise 5 days/week. Within 7 days of completing the prescribed treatment and exercise course, participants will undergo another mock AF PFT. The individual component raw numbers, scores, and composite scores will be recorded and compared to initial mock scores | 28 days |
| Measure | Description | Time Frame |
|---|---|---|
| Determine how renal function is affected by creatine supplementation by measuring renal function labs (BUN/Creatinine/GFR-with Cys C) before and after the study period. | Labs will be draw before initiation of prescribed treatment. Once the 28-day study period has been completed, each participant will be sent to the DGMC laboratory for a final blood draw | 28 days |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Stephen D Kasteler, MD | US Air Force | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| David Grant Medical Center | Fairfield | California | 94535 | United States |
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| ID | Term |
|---|---|
| D009043 | Motor Activity |
| ID | Term |
|---|---|
| D001519 | Behavior |
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| ID | Term |
|---|---|
| D003401 | Creatine |
| D005433 | Flour |
| ID | Term |
|---|---|
| D006146 | Guanidines |
| D000578 | Amidines |
| D009930 | Organic Chemicals |
| D000596 | Amino Acids |
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| Rice Flour | Dietary Supplement | rice flour powder matched for color, appearance, taste, and solubility |
|
| Assess for possible liver damage resulting from creatine supplementation by measuring liver function labs (AST/ALT/Alk Phos) before and after the study period. | Labs will be draw before initiation of prescribed treatment. Once the 28-day study period has been completed, each participant will be sent to the DGMC laboratory for a final blood draw | 28 days |
| Evaluate the risk of rhabdomyolysis with creatine supplementation by measuring creatine kinase before and after the study period. | Labs will be draw before initiation of prescribed treatment. Once the 28-day study period has been completed, each participant will be sent to the DGMC laboratory for a final blood draw | 28 days |
| Treatment compliance as determined by medication diary. | Participants will be given a log book to record their supplement compliance. They will meet with the study coordinator at the two-week mark (between days 10-14) and review their logbook to ensure they are appropriately taking their supplements. Once the 28-day study period has been completed, each participant with meet with a study team member again to turn in their log book | 28 days |
| Quality of workout as determined by exercise diary. | Participants will be given a log book to record their exercise history. They will meet with the study coordinator at the two-week mark (between days 10-14) and review their logbook to ensure they are meeting the requirement of exercising 4 out of 5 days/week. Once the 28-day study period has been completed, each participant with meet with a study team member again to turn in their log book | 28 days |
| D000602 |
| Amino Acids, Peptides, and Proteins |
| D005502 | Food |
| D000066888 | Diet, Food, and Nutrition |
| D010829 | Physiological Phenomena |
| D019602 | Food and Beverages |