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Science & Sports
Volume 26, n° 5
pages 272-277 (novembre 2011)
Doi : 10.1016/j.scispo.2011.07.003
Received : 5 April 2010 ;  accepted : 5 July 2011
The effects of creatine supplementation on performance and hormonal response in amateur swimmers
Effets d’une supplémentation en créatine sur la performance et la réponse hormonale chez des nageurs amateurs
 

D. Sheikholeslami Vatani a, , H. Faraji b, R. Soori c, M. Mogharnasi d
a Department of physical education and sport sciences, University of Kurdistan, Sanandaj, Iran 
b Department of Physical Education & Sport Science, Azad University Branch of Marivan, Marivan, Iran 
c Department of physical education and sport sciences, University of Tehran, Tehran, Iran 
d Department of physical education and sport sciences, University of Sistan & Baluchestan, Zahedan, Iran 

Corresponding author.
Summary
Objectives

The purpose of this study was to determine the influence of short-term creatine supplementation on sprint swimming performance (50 and 100m) and hormonal responses (growth hormone, testosterone and cortisol).

Methods

Twenty amateur male swimmers ingested creatine monohydrate (CR) or a matched placebo (PL) for 6 days. All subjects performed 6 days, swimming exercise. The subjects were tested for performance and hormonal responses the day before and after this creatine loading.

Results

The mean swimming time of CR group in 50m was significantly decreased (Before-period: 53.1±3.73s, after-period: 50.7±2.84s). Growth hormone and cortisol were not affected by this creatine loading. But, testosterone concentration was significantly greater in CR compared to PL after supplementation period (P <0.05).

Conclusions

Our data suggest that short-term creatine supplementation has improved 50m sprint performance in amateur swimmer and it seems unlikely creatine loading is hormonally mediated.

The full text of this article is available in PDF format.
Résumé
Objectifs

Le but de cette étude était de déterminer l’influence à court terme d’une supplémentation en créatine sur la performance lors de sprints en natation (50 et 100m) et sur les réponses hormonales (hormone de croissance, testostérone et le cortisol).

Méthodes

Vingt nageurs amateurs ont ingéré du monohydrate de créatine (CR) ou un placebo (PL) pendant six jours pendant lesquels ils ont poursuivi leur entraînement de natation. Les performances et les réponses hormonales ont été enregistrées le jour précédent et après cette période de charge orale en créatine.

Résultats

Le temps de nage moyen du groupe CR sur 50m était significativement diminué (53,1±3,73 secondes avant charge vs 50,7±2,84 secondes après supplémentation). L’hormone de croissance et le cortisol n’ont pas été affectés par cette charge en créatine. En revanche, la concentration de testostérone était significativement plus élevée dans CR par rapport à PL après la période de supplémentation (p <0,05).

Conclusion

Nos résultats suggèrent qu’une supplémentation de courte durée en créatine a amélioré de manière significative la performance lors de sprints sur 50m chez des nageurs amateurs sans que l’on puisse imputer de manière objective une médiation hormonale.

The full text of this article is available in PDF format.

Keywords : Swimmers, Creatine supplementation, Anabolic hormones

Mots clés : Nageurs, Supplémentation en créatine, Hormones anabolisantes




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