Efficacy and safety of creatine supplementation combined with exercise training in type II diabetic patients: a randomized, double-blind, placebo-controlled, clinical trial / Eficácia e segurança da suplementação de creatina acompanhada de treinamento físico em diabéticos tipo 2: estudo clínico, randomizado, duplo-cego, controlado por placebo

AUTOR(ES)

Bruno Gualano

DATA DE PUBLICAÇÃO

2010

RESUMO

Some studies have suggested that creatine supplementation may attenuate insulin resistance, but whether this supplement is safe remains uncertain. In light of this, the aim of this trial was to investigate the efficacy and safety of creatine supplementation combined with exercise training in patients with type II diabetes. A randomized, double-blind, placebo-controlled, clinical trial was conducted. The patients were submitted to exercise training and received either creatine (CR) or placebo (PL) for 12 weeks. At baseline and after the intervention, glycemic control, lipid profile, physical capacity, body composition, and adverse effects were assessed. Moreover, muscular biopsies were performed to determine the muscle GLUT-4 content and the GLUT-4 translocation, and muscle phosphorylcreatine was assessed by using magnetic resonance spectroscopy. After the intervention, muscle phosphorylcreatine content was higher in the CR group (estimated difference of means: 23.6 mmol/Kg wet muscle; p = 0.03). The CR group also presented decreased glycosylated hemoglobin when compared to the PL group (estimated difference of means: -1.1%; p = 0.004). The oral meal tolerance tests revealed reduced fasting and postprandial glycemia (30 and 60 minutes) in the CR versus the PL group. The muscle GLUT-4 content was similar between groups, but the increase in GLUT-4 translocation was significantly superior in the CR group when compared to the PL group (p = 0.03). In addition, No significant differences between groups were observed for insulinemia, lipid profile, serum peptide C concentration, body composition, aerobic conditioning, strength, and muscle function. Cr supplementation provokes no deleterious effects on kidney and liver functions. The reported adverse effects were similar between groups. Thus, we concluded that creatine supplementation is safe and capable of improving glycemic control in type 2 diabetic patients. ClinicalTrials.gov registration number: NCT00992043

ASSUNTO(S)

efeitos terapêuticos adverse effects efeitos adversos resistência à insulina therapeutics effects nutritional supplements insulin resistance suplementos nutricionais

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