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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
ORIGINAL ARTICLES BODY COMPOSITION, NUTRITION AND SUPPLEMENTATION
The Journal of Sports Medicine and Physical Fitness 2012 April;52(2):165-9
Creatine ingestion effects on oxidative stress in a steady-state test at 75% VO2max
Coco M., Perciavalle V. ✉
Department of Bio-Medical Sciences, University of Catania, Catania, Italy
AIM: The present study was carried out with the aim to analyze the role of creatine on oxidative stress during exercise, i.e. whether creatine is a pro-oxidative or an antioxidant substance.
METHODS: In a randomized double-blind study involving 30 adult males, we examined plasma lactate, oxidative stress markers (malondialdehyde, MDA) and glutathione redox ratio (GSSG·GSH-1), antioxidative systems (vitamins A, E, C), and ergospirometric responses (respiratory quotient and relative oxygen uptake) before and after 30 min steady-state tests 75% VO2max (placebo and creatine).
RESULTS: Ergospirometric tests, hematocrit values, blood lactate as well as vitamins A, E and C concentrations did not show significant differences between creatine and placebo testing. Conversely, oxidative stress markers MDA and GSSG·GSH-1 increased during placebo trials much more than in creatine trials.
CONCLUSION: This is the first report documenting that a creatine loading, i.e., a 0.3 g/kg/die of creatine ingestion for 5 consecutive days, could reduce the oxidative stress, whereas its consumption may not have a clear metabolic advantage in certain aerobic activities.