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In order to study the effects of bicycle activity on respiratory function in adolescents, 29 males who aged 12-15 yrs were selected. Subjects were divided into three groups that cycle athletes group has performed cycle exercise for 90min/week, and bicycle attending school group has attending school at the every day, and control group is untrained students. This method of study was measured resting respiratory function, and during exercise respiratory function. Statistical method adopted for data analysis were oneway ANOVA. Major findings and conclusion are as follows: 1. For the lung function test at rest, lung volume, vital capacity, MVV, FEV0.5-1.0, expiratory and inspiratory flow rate were checked. 2. In results, athletes group and attending school group was showed higher than that of control group.3. During exercise stress test, heart rate, ventilation, oxygen uptake, and VE/MVV were checked by automatic gas analyzer. 4. In results, athletes group and attending school group was showed higher than that of control group. 5. Results of this study indicate that the respiratory function is improved by bicycle activity in adolescents.This study is excepted to contribute for generalization of bicycle activity to for all.