An analysis of pulmonary function in different lying positions in the 20’s normal adults

[Purpose] The purpose of this study was to study the changes in pulmonary functions in relation to lying positions of experimental participants. [Subjects and Methods] Twenty participants participated in this experiment. Measurements were taken in the supine position, the left side-lying position, the right side-lying position, and the prone position. Vital capacity (VC) was evaluated using a Fit mate. [Results] A comparison of four lying position showed significant differences in participants’ VC. In comparison of four position, supine and left sidelying, and between supine and right sidelying, and between supine and prone, between left sidelying and prone. [Conclusion] In conclusion, changing the participants lying position produce changes in pulmonary functions. The greatest change occurred with a supine lying position. We presume that ventilation is affected by body structures. The results provide objective data for establishing the most suitable positions for stroke patients performing respiratory exercises.