Departmental Bulletin Paper 心臓拍動音の精神的安定に対する心理学的・音響学的効果
Psychological and Acoustics Effects of Heartbeat Sounds on Relaxation

原, 修一  ,  河野, 靖美  ,  松田, 沙織  ,  内勢, 美絵子  ,  柏田, 圭一  ,  ハラ, シュウイチ  ,  カワノ, ヤスミ  ,  マツダ, サオリ  ,  ウチセ, ミエコ  ,  カシワダ, ケイイチ  ,  Shuichi, HARA  ,  Yasumi, KAWANO  ,  Saori, MATSUDA  ,  Mieko, UCHISE  ,  Keiichi, KASHIWADA

Description
Aim: We conducted two studies to elucidate the relationship between heartbeat rhythms and relaxation among Japanese babies, young children, and their parents.Subjects and Methods: STUDY 1: Seven parents (age M = 34.3, SD = 5.5 years) with infants or toddlers (age M = 9.4, SD = 6.7 months) participated by listening to three conditions—a heartbeat sound, music, or music with a heartbeat sound—while completing a semantic differential exercise assessing musical imagery. Three types of music (classical, music box, and children’ s songs) were used. Image scores were compared among the three conditions in each type of music. STUDY 2: Participants included 161 parents who listened to three pieces of music, each with a different heartbeat rhythm (patterns A, B, and C). The parents reported their baby or child’ s responses to the music and also self-reported feelings they experienced. Finally, the parents indicated the piece of music they most preferred and related images using the SD exercise. To perform our analyses, we also assessed acoustic characteristics of the three heartbeat sounds.Results: STUDY 1: In the music arranged for a music box, participants evaluated musical imagery as significantly more “airy,” “comfortable,” “feels good,” “relaxing,” “easy,” “awake,” and “amusing” when listening to music with a heartbeat sound, in comparison to the other two conditions (p < .05). STUDY 2: “Rocking the body” and “heard quietly and slept” were the infants’ and toddlers’ responses to the music with a heartbeat sound. Fifty-six parents (34.8%) preferred “pattern A” music, 47 (29.2%) preferred “pattern B,” and 10 (6.3%) preferred “pattern C.” In analysis of “pattern A” acoustics, the mean number of heartbeats per minute, mean heartbeat frequency, maximum heartbeat frequency, and heartbeat Pitch Period Perturbation Quotient (PPQ) were 58/min, 120.3 ± 32.8 Hz, 248.4 Hz, and 11.39%, respectively.Conclusion: This research suggests that a heartbeat sound effective for relaxation has a rhythm of 60 beats/min, low-frequency bandwidth (120–220 Hz), and low percentage of PPQ. Our studies also indicate that music arranged for a music box with a heartbeat sound might be beneficial for inducing relaxation.
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