Effects of Sound Stimuli Created from Fluctuations in Heartbeat Intervals on Fluctuations in Subjects' Heartbeat Intervals

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An important challenge facing modern society is solving the problems caused by the accumulation of fatigue and stress. This paper presents the results of an experiment that aimed to clarify the physiological effects of sound stimuli. Seven types of sound stimulus were presented to ten subjects, aged 19-24 years (8 males and 2 females), and changes in autonomic nerve activity measured. Three types of constant sound were created from averaged electrocardiographic RR intervals, and four types of irregular sound were created from fluctuations in electrocardiographic RR intervals. Each subject completed several 5-minute phases in which they were exposed to each type of sound. The results indicated that the sound created from fluctuations in heartbeat intervals had physiological effects on the subjects. In particular, the heartbeat intervals of subjects were affected by the irregular sounds rather than the constant sounds. Consequently, a significant correlation was observed between sound stimulus and subjects' heartbeat intervals in the latter half of the experiment. In conclusion, the present results suggest that fluctuations in subjects' heartbeat intervals were affected by the sound created from fluctuations in heartbeat intervals.
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