Creatine Timing on Resistance Training Adaptations in College Athletes

In a randomized, double-blind, placebo-controlled, parallel design, eligible study participants were provided a daily dose of creatine monohydrate (pre-or post-workout) or placebo (no creatine delivered) for an 8-week supplementation period. Based upon their baseline fat-free mass, participants were randomized into one of three groups: pre-workout creatine supplementation (PRE), post-workout creatine supplementation (POST), or placebo (PLA). Each group consumed their assigned dose or placebo within one hour before exercise and within one hour following exercise. Each assigned supplement was consumed with 12-16 ounces of fluid along with a 25-gram dose of whey protein isolate and a 25-gram dose of carbohydrate powder This additional supplementation was provided to aid in blinding and to help ensure adequate dietary protein intake was provided to promote increases in lean body mass and strength. Providing daily doses of carbohydrates and protein also helped with recruitment efforts as all study participants received some efficacious nutrients.

All participants completed a twelve-week resistance training and conditioning program. The first four weeks of resistance training (12 workouts) occurred before supplementation began and were completed to acclimate participants to the program and to initiate early neuromuscular adaptations commonly seen with starting a new resistance training program. In addition, this initial 4-week period allowed for some study participants to wash out from ongoing supplementation prior to beginning the supplementation protocol. After completion of this run-in period, participants then completed baseline testing as described and began the supplementation protocol while continuing to follow the resistance training program for an additional eight weeks. Before and after the 8-week supplementation and resistance training period, body mass, body water, and body composition were assessed in addition to changes in muscular strength, muscular endurance, and lower-body power. All statistical analysis was completed on data collected starting at the beginning and end of the supplementation period. Participants were provided nutritional recommendations in order to ensure adequate energy and protein consumption to facilitate positive training adaptations and reduce the potential influence of differing dietary intakes.

Inclusion criteria

• At least 19 years of age but less than 30 years of age.
• Current member of Midland University athletic team completing off-season resistance training program.
• Participants will be healthy as determined by evaluation of medical history and if they are cleared to participate in their sport, they are cleared to participate in the study (as deemed by the team medical provider i.e. Certified Athletic Trainer).

Exclusion criteria

• As indicated on a medical history form they complete, any individual who is currently being treated or is diagnosed with a cardiac, respiratory, circulatory, musculoskeletal, metabolic obesity (defined as body mass index >35 kg/m2 and body fat greater than 30%), immune, autoimmune, psychiatric, hematological, neurological, or endocrinological disorder or disease will be excluded.
• Individuals with allergies to milk or soy (lecithin).
• For females only, if they are currently pregnant or become pregnant at any point throughout the study.