Preventive effects of Spirulina platensis on exercise-induced muscle damage, oxidative stress and inflammation in taekwondo athletes: a randomized cross-over trial

Abstract Background: Spirulina is an interesting nutritional supplement that has attracted a lot of attention. The aim of the present study was to examine the effect of spirulina supplementation on oxidative stress, inflammatory factors and plasma markers of exercise-induced muscle damage in male taekwondo athletes. Results: A total of 18 trained taekwondo male athletes took part in a double-blind, placebo-controlled crossover study. Each subject received either spirulina (8 g/day) or placebo for 3 weeks. The study had two periods separated by a 14-day washout. Blood samples were taken after finishing a training checklist program (4 times in total). There were no significant carryover effects; therefore, the two-week washout period was adequate. Compared to the placebo, a dose of 8 g / d of spirulina supplement over 21 days resulted in a significant decrease in plasma levels of lactate dehydrogenase (LDH), creatine kinase (CK) and interleukin 6 (IL6) and a significant increase in plasma levels of total antioxidant capacity (TAC), superoxide dismutase (SOD) and glutathione peroxidase (GPX) (p0.05). Conclusion: Due to the improvement of antioxidant and anti-inflammatory conditions as well as an appropriate protein content, spirulina supplementation can produce a preventive effect on exercise-induced muscle damage in taekwondo athletes. Trial registration: Iranian Registry of Clinical Trials, IRCT20121110011421N4. Registered 12 July 2021 - Retrospectively registered, https://irct.ir/trial/11692.