Muscle Soreness Relief after Exercise at 70% MHR and Antioxidant Effects of Catechin

บทคัดย่อ

The purpose of this study was to determine whether the antioxidants in catechin reduce biomarkers of oxidative damage and mechanical muscle damage following a treadmill exercise at 70% MHR for 30 minutes. Thirty healthy subjects aged 18-22 years old were randomly assigned into 3 groups of 10 each. Group 1 received placebo while group 2 and 3 received 254 and 381 mg. single dose of catechin extract, respectively. In the exercise phase, the subjects started with 3 minutes walk-jog on the thread mill and then increased the speed until the subject heart rate reached 70% MHR and maintained this intensity until 30 minutes. The measurements and blood samples were taken pre- and post-exercise immediately and after 24 hours.  Blood samples were analyzed for creatine kinase (muscle damage), lactic acid and malondialdehyde. Data analysis revealed that there was no significant difference of  malondialdehyde, lactic acid and creatine kinase between catechin intake and placebo groups at any exercise periods (pre-and post-exercise, and 24 hour after). However, there was a significant difference of malondialdehyde, lactic acid and creatine kinase between catechin intake and placebo group. These results suggest that the protocol did induce oxidative stress and mechanical muscle damage. Morever, the results show no relationship between delayed onset muscle soreness and oxidative stress.  This may be due to the protocol design and catechin extract dosage. Delayed onset muscle soreness was not related to oxidative stress production, and catechin supplementation did not attenuate markers of oxidative stress nor muscle damage in this study