The study was conducted to investigate the effect of aerobic exercise on improving cardiovascular fitness of Debre markos preparatory school at Debre Markos town.15 sedentary preparatory school female students were selected as the study subjects and their age range were from 16-18 years. All selected participants were participated in moderate intensity aerobic exercise for 8 consecutive weeks (3 days per week), 60 minutes duration per day.12 minutes run test and step test were used and pre, during and after training test were conducted on cardiovascular fitness variables. The data collected from the study was analyzed quantitatively using descriptive statistics of central tendency of mean and standard deviation and determined the difference between initial and final mean for participants. According to the analyzed data in 12 minutes run test826.86 meter mean difference was recorded and in step test 28.13 minute per bet mean difference was recorded and also in 12 minutes run test 73.33% of participants located under good performance zone and 26.66% of participants located under marginal zone after training. Based on the findings, it can be concluded that moderate aerobic exercise has positive effect on cardiovascular fitness of sedentary female students.
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