Abstract
Under the noisy environment, music was presented through either of two headphones with different sound insulation properties. Pulse wave on index finger was measured during experiment and stress response due to music with contaminated noise was examined using heart rate variability. Twenty healthy adults (ten men and ten women, average age 23.2±3.6 years) had participated in this experiment. Music (concerto “four seasons” by Vivaldi) was reproduced from CD and presented for 40 sec in block design to the subject through either of headphones with an interruption of 40 sec without music. Three blocks were done in this experiment.
According to the subjective reports after the experiment, audibility of music depends upon an insulation property of a headphone. Furthermore, variability of heart rate significantly altered due to music presentation under the noisy environment, i.e., values of L/T and of CV-RR decreased significantly under the condition of insufficient sound insulation. I confirmed that autonomic nervous activity might be also affected significantly due to music presentation through headphone with insufficient sound insulation under the noisy environment.
