Document Type : Research Paper I Open Access I Released under (CC BY-NC) license
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Abstract
َAim: In this study, the effect of green tea extract consumption on plasma Homocysteine (Hcy) and oxidized low-density lipoprotein (ox-LDL) was evaluated after acute resistance exercise in untrained men.
Method: For this purpose, 8 sedentary males (age 36.12±3.11 year; BMI 22.59±2.11kgm2) randomly selected and, in a randomized, double-blind, placebo-controlled crossover study consumed green tea extract (two capsules of 500 mg per day) or placebo (2 capsules of 500 mg per day maltodextrin) for 2 weeks. After this period, they participated in resistance exercise that involves three sets with 75% of one repetition maximum (1RM) and 2 minutes rest between sets and exercises. Blood samples were collected from the brachial vein before and after the resistance exercise to determine the concentration of Hcy and ox-LDL.
Results: The result of for ANOVA Repeated Measures showed significant differences in ox-LDL concentration in time and between conditions of green tea extract and placebo (P<0.05), Bonferroni post hoc test was used to check further evaluation, revealed a significant decrease in the concentration of ox-LDL immediately after resistance exercise in green tea compared with placebo (p<0.05) and t-test showed a significant increase in this index in pre-test compared to post-test in the placebo condition (p<0.01). In relation to serum concentration of Hcy, findings suggest a significant increase in this Index at post-test compared to pre-test only in terms of taking placebo (p<0.01).
Conclusion: In general, the findings suggest a beneficial effect of 2 weeks green tea extract to prevent a significant increase in serum levels of ox-LDL after acute resistance exercise which is known as one of the key factors in the development of atherosclerosis. However, consumption of green tea extract did not have significant effect on serum Hcy concentration after acute resistance exercise.
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