Cardiac Autonomic Nervous System Activity on Breathing Training

The purpose of this study is to evaluate effects of breathing training on cardiac autonomic nervous system (CANS) activities through Tone-Entropy analysis during a breathing training trial and before and after the training trial. CANS activity is intensely associated with breathing rhythm. In this experiment, the device that makes load to respiratory muscle is used to perform breathing training for twelve male subjects. R-R intervals were severally measured for 5 minutes during trials: the breathing training trial (T), the resting state before T trial (V1), the resting state trials after T trial were V2 and V3 in order. Our results show that parasympathetic activities in all the subjects were excited because Tone-Entropy plots distributed at relatively right-lower positions. HR became higher during T trial than any other trials. After T trials, parasympathetic activity was gradually increased from V2 to V2 trials owing to nervous system recovery. It is indicated that Tone-Entropy analysis show the detailed process of alteration of CANS activity, especially parasympathetic activity during breathing training and its recovery.