TY - JOUR
T1 - Effect of creatine and β-alanine supplementation on performance and endocrine responses in strength/power athletes
AU - Hoffman, Jay
AU - Ratamess, Nicholas
AU - Kang, Jie
AU - Mangine, Gerald
AU - Faigenbaum, Avery
AU - Stout, Jeffrey
PY - 2006
Y1 - 2006
N2 - The effects of creatine and creatine plus β-alanine on strength, power, body composition, and endocrine changes were examined during a 10-wk resistance training program in collegiate football players. Thirty-three male subjects were randomly assigned to either a placebo (P), creatine (C), or creatine plus β-alanine (CA) group. During each testing session subjects were assessed for strength (maximum bench press and squat), power (Wingate anaerobic power test, 20-jump test), and body composition. Resting blood samples were analyzed for total testosterone, cortisol, growth hormone, IGF-1, and sex hormone binding globulin. Changes in lean body mass and percent body fat were greater (P < 0.05) in CA compared to C or P. Significantly greater strength improvements were seen in CA and C compared to P. Resting testosterone concentrations were elevated in C, however, no other significant endocrine changes were noted. Results of this study demonstrate the efficacy of creatine and creatine plus β-alanine on strength performance. Creatine plus β-alanine supplementation appeared to have the greatest effect on lean tissue accruement and body fat composition.
AB - The effects of creatine and creatine plus β-alanine on strength, power, body composition, and endocrine changes were examined during a 10-wk resistance training program in collegiate football players. Thirty-three male subjects were randomly assigned to either a placebo (P), creatine (C), or creatine plus β-alanine (CA) group. During each testing session subjects were assessed for strength (maximum bench press and squat), power (Wingate anaerobic power test, 20-jump test), and body composition. Resting blood samples were analyzed for total testosterone, cortisol, growth hormone, IGF-1, and sex hormone binding globulin. Changes in lean body mass and percent body fat were greater (P < 0.05) in CA compared to C or P. Significantly greater strength improvements were seen in CA and C compared to P. Resting testosterone concentrations were elevated in C, however, no other significant endocrine changes were noted. Results of this study demonstrate the efficacy of creatine and creatine plus β-alanine on strength performance. Creatine plus β-alanine supplementation appeared to have the greatest effect on lean tissue accruement and body fat composition.
KW - Anaerobic exercise
KW - Ergogenic aids
KW - Nutritional supplementation
UR - http://www.scopus.com/inward/record.url?scp=33748702884&partnerID=8YFLogxK
U2 - 10.1123/ijsnem.16.4.430
DO - 10.1123/ijsnem.16.4.430
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
C2 - 17136944
AN - SCOPUS:33748702884
SN - 1526-484X
VL - 16
SP - 430
EP - 446
JO - International Journal of Sport Nutrition and Exercise Metabolism
JF - International Journal of Sport Nutrition and Exercise Metabolism
IS - 4
ER -