title: A Pilot Study Examining the Effects of 8-Week Whey Protein versus Whey Protein Plus Creatine Supplementation on Body Composition and Performance Variables in Resistance-Trained Women.
abstract: We performed a pilot study examining the effects of whey protein and creatine supplementation (PRO + CRE group) versus whey protein supplementation (PRO group) alone on body composition and performance variables in a limited number of resistance-trained women.
  
  
  
  Seventeen resistance-trained women (21 ± 3 years, 64.7 ± 8.2 kg, 23.5 kg/m2, 26.6 ± 4.8% body fat, >6 months of training) performed a 4-day per week split-body resistance training program for 8 weeks. Subjects ingested either 24 g PRO (n = 9) or 24 g whey plus 5 g creatine monohydrate (PRO + CRE, n = 8) following each exercise bout. At baseline (T1), 4 weeks (T2) and 8 weeks (T3), body composition was measured by dual X-ray absorptiometry (DXA), strength measures (leg press and bench press one repetition maximum) and lower-body power measures were determined.
  
  
  
  DXA lean mass increased from T1 to T3 in both groups (PRO: +2.5 kg, p < 0.001; PRO + CRE: +2.5 kg, p < 0.001), although no differences between groups were observed. Compared to T1 values, performance measures similarly increased in both groups from T1 to T3 although, no between-group differences were observed.
  
  
  
  PRO + CRE did not enhance training adaptations compared to PRO, albeit studies employing longer-term interventions with larger sample sizes are needed in order to confirm or disprove our findings.
authors.affiliation: Human Performance Laboratory, Exercise and Sport Sciences Department, University of Mary Hardin-Baylor, Belton, Tex., USA.
authors.forename: Colin D
authors.initials: CD
authors.lastname: Wilborn
authors.forename: Jordan J
authors.initials: JJ
authors.lastname: Outlaw
authors.forename: Petey W
authors.initials: PW
authors.lastname: Mumford
authors.forename: Stacie L
authors.initials: SL
authors.lastname: Urbina
authors.forename: Sara
authors.initials: S
authors.lastname: Hayward
authors.forename: Michael D
authors.initials: MD
authors.lastname: Roberts
authors.forename: Lem W
authors.initials: LW
authors.lastname: Taylor
authors.forename: Cliffa A
authors.initials: CA
authors.lastname: Foster
mesh_terms: D015502:Absorptiometry, Photon; D001823:Body Composition; D003401:Creatine / Q000008:administration & dosage*; D019587:Dietary Supplements; D005260:Female; D006801:Humans; D053580:Muscle Strength; D010865:Pilot Projects; D055070:Resistance Training; D016896:Treatment Outcome; D000067816:Whey Proteins / Q000008:administration & dosage*; D055815:Young Adult
chemical_list: D000067816:Whey Proteins; D003401:Creatine