[[abstract]]ABSTRACT Healthy problems caused by the obesity have become more and more serious in wealthy Taiwan. The purpose of this study was to investigate the effects of different weight on heartbeats of normal and overweighed male junior high school students, whose ages were 15 and both height and weight met or went behind the BMI standards set by the Ministry of Education, in the period of PACER exam. Before the PACER exam, 523 male third-grade students at Shulin Junior High school in Taipei County were under the measures of height and weigh first. Male students with BMI met the standards of overweight (BMI > PR95) were selected at random and divided into normal group, overweight group, and obese group. There were 25 students in every group. These tests with Polar watch had their heartbeats measure before, during, and after the exam, and the heartbeats after the exercise 1 to 3 minutes were measured by per 5 minutes. The recording statistics of PACER laps, total work, and heartbeats before, during, and after exam were analyzed through One way ANOVA and General Linear Model to investigate the differences among normal students, overweight students, and the obese students with p<.05 as the level of significant difference. And results were as following. First, during the PACER test, the average laps of normal students (41.63 + 9.28 laps) was significantly more than the overweighed students’ (30.04 +9.98 laps) and the obese students’ (25.40 + 9.02 laps) ,p <.05. Second, in total work, there was an obvious difference in the average work between the normal group (49918.40 + 12579.49 joule) and the obese group (40420.80 + 13177.49 joule). Third, before the PACER exam, the average heartbeats of the normal students (83.36 + 11.03) were lower than the overweighed group (92.16 + 15.50) and obese group (92.92 + 11.64) ,p <.05. Forth, there was no significant difference in the heartbeats and recovering speed among the normal students, overweight students, and obese students after the test first to the third minutes except the significant differences in changes of heartbeats at the first to the second minute during the test and the heartbeats rising speeds at the first and the second minutes during the test.
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