The effect of moderate-intensity acute aerobic exercise duration on the percentage of circulating CD31^+ cells in lymphocyte population

Background: the increasing number of circulating cd31^+ endothelial progenitor cells is one of the important factors for maintaining vascular homeostasis. exercise will effectively increase the number of circulating cd31^+ endothelial progenitor cells. this study aims to determine the effect of moderate-intensity acute aerobic exercise duration on the percentage of circulating cd31^+ cells in untrained healthy young adult subjects. methods: this study was an experimental study. untrained healthy volunteers (n=20) performed ergocycle at moderateintensity (64–74% maximum heart rate) for 10 minutes or 30 minutes. immediately before and 10 minutes after exercise, venous blood samples were drawn. the percentage of cd31^+ cells in peripheral blood was analyzed using flow cytometry. data was statistically analyzed using student t-test. results: there were no significant differences in the mean percentage of circulating cd31^+ cells before and after exercise for 10 minutes and 30 minutes (p>0.05). however, there was a different trend in the percentage of circulating cd31^+ cells after exercise for 10 minutes and 30 minutes. in the 10 minutes duration, 50% of subjects showed increase. whereas in the 30 minutes duration, 80% of subjects showed increase. conclusion: the percentage of circulating cd31^+ cells before and after exercise for 10 minutes was not different compared to 30 minutes. however, data analysis shows that majority of subjects (80%) had increased in the percentage of circulating cd31^+ cells after 30 minutes exercise.