Creatine supplementation: effects on urinary excretion and anaerobic performance
Havenetidis K, Bourdas D
The Journal of sports medicine and physical fitness · 16 citas
Etiquetas de revisión
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Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2003-09-01 · J Sports Med Phys Fitness · vol. 43 · número 3 · págs. 347–55
- Editorial
- National Institutes of Health
- Citado
- 26 citas · más que el 52% de estudios similares · 0.2× el promedio de su campo
- Referencias
- 0 trabajos
- Acceso
- De pago
- Áreas de investigación
- Muscle metabolism and nutrition · Sports Performance and Training · Biochemical effects in animals
- Palabras clave
- creatine supplementation, urinary creatine, urinary creatinine, anaerobic performance, Wingate test, peak power, dose-response relationship, creatine loading, sprint training
- MeSH
- humans, lactic acid, creatinine, exercise, nutritional support, analysis of variance, double-blind method, random allocation, adult, male, statistics as topic
2 autores
- Konstantinos Havenetidis🇬🇷Hellenic Military Academy
- D Bourdas
Resumen
El texto original del estudio, en el idioma en que se publicó.
Aim
The aim of the present study is to investigate Urinary creatine (URCR) and urinary creatinine (URCRN) response to CR supplementation in conjunction with exercise performance.
Methods
Twenty-one sprint trained males were randomly divided into 3 groups. Each group followed a different CR dosage (10 g, 25 g and 35 g x day(-1) for 4 days) and placebo (Pl) in the 1(st) and 2(nd) week, respectively. A double-blind design was used. Subjects' urine was collected every 24 hours during the entire period of supplementation (SP). All groups, at the end of each SP performed 3 times the Anaerobic Wingate Test (AWT) with 6 min active recovery (60 rpm) on a cycle ergometer.
Results
Significantly (p<0.01) higher peak and mean power values were produced during the CR compared to Pl condition. A significant correlation (r=0.7, p<0.05) was also observed between peak power improvement (PPI) and URCR for the 3 groups. No such relationship was found between URCRN. Across all groups, URCR and URCRN increased significantly following ingestion compared with Pl (p<0.001). URCR post- supplementation presented a 7.4 fold, 36 fold and 21 fold increase for 10 g, 25 g and 35 g dose respectively, whilst URCRN presented a mean 2.4 fold increase for all different doses, which clearly shows the magnitude of sensitivity of these indices to CR supplementation. A strong correlation (r=0.95, p<0.01) observed between dose of CR ingestion and mean URCR (MRUCR) with prediction formula: CR = -0.936 + (5.613 x MRUCR) (SEE=3.5).
Conclusion
URCR was an effective measure of each CR dosage administered as well as of the excretion pattern that each group followed throughout the SP. Furthermore the strong relationship of URCR and PPI could be particularly useful for monitoring and optimising CR loading in athletic populations.
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