[[abstract]]The purpose of this study was to compare the different cardiovascular response between male obese and normal primary school students during PACER exercise. Seventeen normal and eighteen obese primary school students participated in body composition analyzing and exercising PACER fitness test. During PACER exercise, heart rate and blood pressure were measured as indexes for cardiovascular respond. Independent t-tests were utilized to determine significant differences between male obese and normal students on all variables. The level of significance was set at .05. The result showed that（1）body composition： male obese primary school students have significant higher total body fat percentage, trunk fat percentage, upper extremities fat percentage, and lower extremities fat percentage than normal primary school students （p<.05）. In all participants, waist circumference has higher relation to body fat percentage and trunk fat percentage than body mass index. Few male obese students were regarded as normal or overweight while facilitating three body mass index standards in Taiwan.（2）PACER exercise：After data was analyzed with step regression, lower extremities muscle percentage and age can explain 84% of PACER laps performance. Compared with the fitness test standards in USA and Japan, all participants have lower PACER laps performance.（3）cardiovascular response：The increases of systolic and diastolic blood pressure in male obese students are higher than male normal students. Heart rate recovery to the baseline in male obese students is slower than male normal students. In this study, we concluded that：（1）Body mass index can not totally reflect the obese degree of school-aged males. Waist circumference is a good index to evaluate the degree of obesity. （2）The main factor affects schoolchildren’s PACER performance is the percentage of lower extremities. Teachers should train the students’ muscular strength to improve their cardiovascular fitness ；（3）Male normal school students’s have better cardiovascular adaptation than male obese school students. It is possible that male obese school students suffer from cardiovascular disease in the future. If we consider the maximal heart rate that all participants achieved, PACER seems to be a good fitness test for schoolchildren.
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