Low-dose creatine supplementation enhances fatigue resistance in the absence of weight gain.
Nutrition
; 27(4): 451-5, 2011 Apr.
Article
em En
| MEDLINE
| ID: mdl-20591625
ABSTRACT
OBJECTIVE:
We examined the effects of 6 wk of low-dose creatine supplementation on body composition, muscle function, and body creatine retention.METHODS:
Twenty healthy men and women (21 ± 2 y old) were randomized to receive creatine (0.03 g · kg(-1) · d(-1); n = 10, 4 women) or placebo (n = 10, 4 women) for 6 wk in a double-blind placebo-controlled fashion. Participants were tested on two occasions before supplementation to establish a reliable baseline, and then were retested after supplementation. Testing included body composition, maximal strength (three-repetition maximal concentric knee extension at 180 degrees/s), muscle fatigue (five sets of 30 concentric knee extensions at 180 degrees/s), and plasma creatine concentration.RESULTS:
There were no significant differences in body mass, fat-free mass, fat mass, body fat percentage, total body water, or maximal strength in either group from before to after supplementation (all P > 0.05). After supplementation, plasma creatine increased significantly in the creatine group (+182%, P = 0.03), with no difference in the placebo group. Compared with baseline values, creatine-supplemented volunteers were more resistant to fatigue during sets 2 (7%), 3 (9%), 4 (9%), and 5 (11%) (all P < 0.05). In placebo-supplemented participants, there was no improvement in fatigue resistance during sets 2 (0%), 3 (1%), 4 (0%), and 5 (-1%) (all P > 0.05).CONCLUSION:
Ingesting a low dose (≈2.3 g/d) of creatine for 6 wk significantly increased plasma creatine concentration and enhanced resistance to fatigue during repeated bouts of high-intensity contractions.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Músculo Esquelético
/
Fadiga Muscular
/
Suplementos Nutricionais
/
Creatina
Tipo de estudo:
Clinical_trials
Limite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Nutrition
Assunto da revista:
CIENCIAS DA NUTRICAO
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Estados Unidos