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High-dose short-term creatine supplementation without beneficial effects in professional cyclists: a randomized controlled trial.
Barranco-Gil, David; Alejo, Lidia B; Revuelta, Carlos; Górriz, Miguel; Pagola, Itziar; Ozcoidi, Laureano M; Lucia, Alejandro; Valenzuela, Pedro L.
Afiliación
  • Barranco-Gil D; Universidad Europea de Madrid, Faculty of Sport Sciences, Madrid, Spain.
  • Alejo LB; Universidad Europea de Madrid, Faculty of Sport Sciences, Madrid, Spain.
  • Revuelta C; Research Institute of Hospital 12 de Octubre (imas12), Physical Activity and Health Research Group (PAHERG), Madrid, Spain.
  • Górriz M; Universidad Europea de Madrid, Faculty of Sport Sciences, Madrid, Spain.
  • Pagola I; Caja Rural Professional Team, Navarra, Spain.
  • Ozcoidi LM; Universidad Europea de Madrid, Faculty of Sport Sciences, Madrid, Spain.
  • Lucia A; Caja Rural Professional Team, Navarra, Spain.
  • Valenzuela PL; Universidad Europea de Madrid, Faculty of Sport Sciences, Madrid, Spain.
J Int Soc Sports Nutr ; 21(1): 2340574, 2024 Dec.
Article en En | MEDLINE | ID: mdl-38606895
ABSTRACT

BACKGROUND:

Growing evidence supports the ergogenic effects of creatine supplementation on muscle power/strength, but its effects on endurance performance remain unclear. We assessed the effects of high-dose short-term creatine supplementation in professional cyclists during a training camp.

METHODS:

The study followed a double-blind, randomized parallel design. Twenty-three professional U23 cyclists (19 ± 1 years, maximum oxygen uptake 73.0 ± 4.6 mL/kg/min) participated in a 6-day training camp. Participants were randomized to consume daily either a recovery drink (containing carbohydrates and protein) with a 20-g creatine supplement (creatine group, n = 11) or just the recovery drink (placebo group, n = 12). Training loads and dietary intake were monitored, and indicators of fatigue/recovery (Hooper index, countermovement jump height), body composition, and performance (10-second sprint, 3-, 6-, and 12-minute time trials, respectively, as well as critical power and W') were assessed as study outcomes.

RESULTS:

The training camp resulted in a significant (p < 0.001) increase of training loads (+50% for total training time and + 61% for training stress score, compared with the preceding month) that in turn induced an increase in fatigue indicators (significant time effect [p < 0.001] for delayed-onset muscle soreness, fatigue, and total Hooper index) and a decrease in performance (significant time effect [p = 0.020] for critical power, which decreased by -3.8%). However, no significant group-by-time interaction effect was found for any of the study outcomes (all p > 0.05).

CONCLUSIONS:

High-dose short-term creatine supplementation seems to exert no consistent beneficial effects on recovery, body composition or performance indicators during a strenuous training period in professional cyclists.
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Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Rendimiento Atlético Idioma: En Revista: J Int Soc Sports Nutr Año: 2024 Tipo del documento: Article País de afiliación: España

Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Rendimiento Atlético Idioma: En Revista: J Int Soc Sports Nutr Año: 2024 Tipo del documento: Article País de afiliación: España