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Purpose: The purpose of this study was to analyze the factors affecting pulmonary functions of physical characteristics in adults 20 to 23 years aged. Methods: Twenty-four subjects(22.25±1.48) participated in the experiment. The pulmonary functions; FVC(forced vital capacity), FEV1(forced expiratory volume in one second), FEV1/FVC was measured using a portable spirometer, the abdominal muscle thickness was measured using ultrasound during inspiration and expiration, muscle strength was measured using a handheld dynamometer. Results: Changes in abdominal muscle thickness during respiration, and muscle strength in the upper extremity and neck were positively correlated with pulmonary functions(p<.05). Conclusion: Abdominal, upper extremity and neck exercises can be recommended as an intervention for improving pulmonary functions.