[Purpose] We investigated how diaphragm respiration exercises can affect pulmonary function in longterm
male smokers in their twenties. [Subjects and Methods] Twenty-eight healthy males between 20 and 29 years
of age were randomly divided into an experimental and a control group (14 members each). The experiment was
conducted during 30 min sessions, 3 times a week for 4 weeks. The experimental group performed diaphragm respiration
exercises and the control group performed exercises using MOTOmed. Pulmonary function (tidal volume,
breathing capacity, inspiratory reserve volume, inspiratory capacity, and expiratory reserve volume) was evaluated
and analyzed before and after the experiment. [Results] Our results revealed significant increases in tidal volume,
inspiratory reserve volume, inspiratory capacity, and breathing capacity in the experimental group. These increases
were greater in the experimental group than in the control group. [Conclusion] In our study, the experimental group
which performed diaphragm respiration exercises showed a greater improvement in pulmonary function compared
with the control group. It is hypothesized that greater improvement in pulmonary function is expected if diaphragm
respiration exercises are implemented taking into account the age of the smokers.