Creatina
Abstract
Aims ¯ Analyse the effets of creatine supplementation on power output.
Methods and results ¯ Nine subjects performed maximal intermittent plantar flexion before and after ingestion of 20 g creatine (Cr) monohydrate/day for six days. After Cr ingestion, mean power output (MPO) was increased by ~10% (P < 0.05) from bouts 3 to 7. Muscle PCr resynthesis rate increased by about 40% (P < 0.05) after Cr ingestion during recovery periods. High correlations were found between the percentage of PCr resynthesis and the percentage restoration of MPO during bouts 5, 6 and bout 7 (P < 0.05).
Conclusion ¯ The increase in performance following Cr ingestion was attributed to an increased PCr resynthesis rate during recovery.
Mots-clé: créatine; pH intramusculaire; phosphocréatine; puissance maximale; récupérationMots-clé: creatine; maximal power output; phosphocreatine; recovery
*1 Communication présentée lors du Colloque « Biologie de l'Exercice », Clermont-Ferrand, 30¯31 mai 1999, France.
Aims ¯ Analyse the effets of creatine supplementation on power output.
Methods and results ¯ Nine subjects performed maximal intermittent plantar flexion before and after ingestion of 20 g creatine (Cr) monohydrate/day for six days. After Cr ingestion, mean power output (MPO) was increased by ~10% (P < 0.05) from bouts 3 to 7. Muscle PCr resynthesis rate increased by about 40% (P < 0.05) after Cr ingestion during recovery periods. High correlations were found between the percentage of PCr resynthesis and the percentage restoration of MPO during bouts 5, 6 and bout 7 (P < 0.05).
Conclusion ¯ The increase in performance following Cr ingestion was attributed to an increased PCr resynthesis rate during recovery.
Mots-clé: créatine; pH intramusculaire; phosphocréatine; puissance maximale; récupérationMots-clé: creatine; maximal power output; phosphocreatine; recovery
*1 Communication présentée lors du Colloque « Biologie de l'Exercice », Clermont-Ferrand, 30¯31 mai 1999, France.
