Physical Inactivity
Conditions
Keywords
creatine, blood flow restriction, exercise
Brief summary
This research is examining the changes in muscle size, muscle function, body composition, strength, and blood vessel health. Specifically, the changes in these variables over the course of 8 weeks of training with or without blood flow restriction (BFR) and the supplementation of creatine or placebo (dextrose, a sugar in the form of a powder which is the standard placebo). Creatine monohydrate (Cr) is the most popular supplement for athletes and benefits all populations, however women are still very hesitant to take it due to the misconception of weight gain. This study will look to measure those muscle and body changes with exercise.
Detailed description
We expect that you will be in this research study for an estimated 10 weeks, with 27 visits total. You will be asked to complete questionnaires, blood draws, and perform exercises using exercise machines for testing the strength of your legs while using a blood pressure cuff during some of these exercises. Other tests in this study will measure hydration (water in your system) status, your nervous system, and body composition percentage (bone/muscle tissue/fat tissue). Specifically, you will be asked to attend: * 1 consent visit with familiarization (60min) * 1 baseline assessment with a blood sample (60min) * 1 baseline strength assessment (45min) * 2 creatine supplementation loading day visits (15min) * 1 post loading assessment with a blood sample (60min) * 1 post loading strength assessment (45min) * 16 training days (60min each) two of which will have blood samples (+70min) * 1-4wk follow up assessment (45min) * 1 4wk follow up strength assessment (45min) * 1 posttest assessment (45min) * 1 posttest strength assessment (45min)
Interventions
DIETARY_SUPPLEMENTCreatine Monohydrate
Creatine supplementation for 8 weeks, 5g daily. A 5 day loading phase will be implemented with 20g daily for 5 days.
DEVICEBlood Flow Restriction
Blood Flow Restriction Cuffs applied during exercise
OTHERExercise
Participants will exercise
Sponsors
University of Central Florida
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
BASIC_SCIENCE
Masking
DOUBLE (Subject, Investigator)
Intervention model description
double blind placebo controlled
Eligibility
Sex/Gender
FEMALE
Age
18 Years to 35 Years
Healthy volunteers
Yes
Inclusion criteria
* Are female between the ages of 18 to 35 * Recreationally active, defined as meeting the ACSM standards for recreationally active individuals of participating in physical activity ≥ 150 minutes exercise/week. * Not following a resistance training program * Are Not currently taking creatine monohydrate or have not taken it in the last 6 weeks * No known cardiovascular, pulmonary, metabolic, muscular, and/or coronary heart disease (i.e. heart failure, diabetes, COPD, etc.) * Do not regularly use prescription medication (not including contraceptives) * Are not currently seeking medical care. * Are not currently pregnant.
Exclusion criteria
* Taking creatine or has taken creatine in the last 6 weeks * Currently resistance training * Pregnant
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Strength | Pre, 5-Days post loading, 4wk, 8wk | isokinetic dynanometer |
| Body Composition | Pre, 5-Days post loading, 4wk, 8wk | BIS, BodPod |
| Neuromuscular Function | Pre, 5-Days post loading, 4wk, 8wk | EMG |
| Endothelial Function | Pre, 5-Days post loading, 4wk, 8wk | Flow Mediated Dilation |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Mood States | Pre, 5-Days post loading, 4wk, 8wk | Mood Assessed via administration of the POMS Questionnaire. 58 words or phrases are presented in a Likert format questionnaire reflecting how the subject feels at the time of completing the questionnaire. Scores range from 0 (Not at all) to 4 (Extremely). Tension, depression, anger, vigor, fatigue, confusion and total mood disturbance (TMD) will be measured. |
Countries
United States
Outcome results
None listed