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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
Rivista di Medicina, Traumatologia e Psicologia dello Sport
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
The Journal of Sports Medicine and Physical Fitness 2000 Dicembre;40(4):336-42
Acute creatine loading enhances human growth hormone secretion
Schedel J. M. 1, 2, 3, Tanaka H. 2, Kiyonaga A. 2, Shindo M. 2, Schutz Y. 3
1 Laboratory of Exercise Physiology and Biomechanics, Graduate School of Physical Education, Chukyo University, Toyota, Japan;
2 Laboratory of Exercise Physiology, Department of Sport Sciences, Fukuoka University, Fukuoka, Japan;
3 Institute of Physiology, Faculty of Medicine, University of Lausanne, Lausanne, Switzerland
Background. The main objective of this study was to explore the effect of acute creatine (Cr) ingestion on the secretion of human growth hormone (GH).
Methods. In a comparative cross-sectional study, 6 healthy male subjects ingested in resting conditions a single dose of 20 g creatine (Cr-test) vs a control (c-test). During 6 hours the Cr, creatinine and GH concentrations in blood serum were measured after Cr ingestion (Cr-test).
Results. During the Cr-test, all subjects showed a significant stimulation of GH (p<0.05), but with a large interindividual variability in the GH response: the difference between Cr-test and c-test averaged 83% (SD 45%). For the majority of subjects the maximum GH concentration occurred between 2 hrs and 6 hrs after the acute Cr ingestion.
Conclusions. In resting conditions and at high dosages Cr enhances GH secretion, mimicking the response of strong exercise which also stimulates GH secretion. Acute body weight gain and strength increase observed after Cr supplementation should consider the indirect anabolic property of Cr.