The purpose of this study was to examine the difference in mood changes between abdominal and thoracic breathing. 20 university students were divided into an abdominal breathing group and a thoracic breathing group and performed the breathing using image-based breathing instructions, and the score of the mood measured before and after the breathing. Two-way analysis of variance found that anger, confusion, depression, fatigue, and tension scores significantly decreased and vigor scores increased significantly in both breathing groups. Furthermore, it was found that the depression score was lower in the thoracic breathing group than in the abdominal one. The result that abdominal breathing reduces negative mood supports the previous research. Also, it is assumed that chest breathing became closer to deep breathing by image-based instruction. In addition, it is possible that image-based thoracic breathing instructions led to consciousness of exchange of air in their body and mind, leading to a reduction in depression. The trends in mood changes in the abdominal and thoracic breathing group were similar, but there was a difference in the contents of the impressions of the two groups. Therefore, it may be necessary to examine contents of image-based instructions of the breathing method in more detail.
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