In breaststroke, the swimming technique is particularly important since the motion is complicated and the heaving and pitching motions of the body are large. Therefore, there is a possibility to enhance the swimming performance if the center of body buoyancy is changed by breathing to help the heaving and pitching motions. The objective of this study was to clarify the influences of the time variation of the position and volume of lung air on the performance in breaststroke by the simulation analysis. The simulation model which can consider the buoyancy was constructed. The position of lung air center for the simulation was obtained from the experiment of the previous study. The influences of costal and abdominal breathings on the performance were analyzed. From the analysis, the effectiveness of the abdominal breathing and movement of the lung air center was shown. The simulation considering the time variation of the lung air was also carried out. The appropriate time variation was clarified by this simulation.
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