Abstract
The purpose of this study was to investigate which of the two conditions would allow a child with severe motor and intellectual disability to relax and play an instrument during music therapy based on heart rate variability: "Along with a song and piano accompaniment, the child touches a tree chime assisted by a caregiver with her left hand" or "the child moves her left hand approximately 5 mm to play an electronic instrument, Cymis(Cyber Musical Instrument with Score), when the caregiver has the child hold a switch of Cymis in her left hand and sings with piano accompaniment.The client’s heart rate variability during music therapy was longitudinally measured and analyzed seven times over a period of 11 months, suggesting that the degree of relaxation was higher when the electronic instrument Cymis was used. The results suggest that the children's heart rate variability may differ depending on the musical instrument used, and that the analysis of heart rate variability may provide clues for providing educational care while valuing the children's individuality.
https://ror.org/0151bmh98 
