title: Effect of low dose, short-term creatine supplementation on muscle power output in elite youth soccer players.
abstract: BACKGROUND
  To determine the effects of a low dose, short-term Creatine monohydrate (Cr) supplementation (0.03 g.kg.d-1during 14 d) on muscle power output in elite youth soccer players.
  
  
  METHODS
  Using a two-group matched, double blind, placebo-controlled design, nineteen male soccer players (mean age = 17.0 ± 0.5 years) were randomly assigned to either Cr (N= 9) or placebo (N= 10) group. Before and after supplementation, participants performed a 30s Wingate Anaerobic Test (WAnT) to assess peak power output (PPO), mean power output (MPO), fatigue index (FI), and total work.
  
  
  RESULTS
  There were significant increases in both PPO and MPO after the Cr supplementation period (P≤ 0.05) but not the placebo period. There were also significant increases in total work, but not FI, after the Cr supplementation and placebo periods (P≤ 0.05). Notably, there were differences in total work between the Cr and placebo groups after (P≤ 0.05) but not before the 14 d supplementation period.
  
  
  CONCLUSIONS
  There is substantial evidence to indicate that a low-dose, short-term oral Cr supplementation beneficially affected muscle power output in elite youth soccer players.
authors.affiliation: Dirección de Investigación, Universidad Mayor Santiago de Chile; Universidad Santo Tomás, Talca. Chile. Carrera de Educación Física, Santiago de Chile, Chile.
authors.forename: Aquiles
authors.initials: A
authors.lastname: Yáñez-Silva
authors.affiliation: Department of Physical Education, North University of Parana, Londrina, Brazil.
authors.forename: Cosme F
authors.initials: CF
authors.lastname: Buzzachera
authors.affiliation: School of Physical Education, Max Planck Faculty, Indaiatuba, Brazil.
authors.forename: Ivan Da C
authors.initials: IDC
authors.lastname: Piçarro
authors.affiliation: Department of Physical Education, North University of Parana, Londrina, Brazil.
authors.forename: Renata S B
authors.initials: RSB
authors.lastname: Januario
authors.affiliation: Department of Physical Education, Research Group on Metabolism, Nutrition and Strength Training, Curitiba, Brazil.
authors.forename: Luis H B
authors.initials: LHB
authors.lastname: Ferreira
authors.affiliation: Department of Health and Exercise Science, Appalachian State University, Boone, USA.
authors.forename: Steven R
authors.initials: SR
authors.lastname: McAnulty
authors.affiliation: Department of Health and Exercise Science, Appalachian State University, Boone, USA.
authors.forename: Alan C
authors.initials: AC
authors.lastname: Utter
authors.affiliation: Department of Physical Education, Research Group on Metabolism, Nutrition and Strength Training, Curitiba, Brazil.|Department of Health and Exercise Science, Appalachian State University, Boone, USA.
authors.forename: Tacito P
authors.initials: TP
authors.lastname: Souza-Junior
mesh_terms: D000293:Adolescent; D003401:Creatine / Q000008:administration & dosage* / Q000494:pharmacology; D019587:Dietary Supplements; D004311:Double-Blind Method; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000187:drug effects / Q000502:physiology*; D010807:Physical Endurance / Q000187:drug effects; D012916:Soccer; D064133:Sports Nutritional Physiological Phenomena; D013647:Task Performance and Analysis
chemical_list: D003401:Creatine
keywords: Anaerobic performance; Creatine supplementation; Wingate test