2024-03-28T08:42:28Z
https://soar-ir.repo.nii.ac.jp/oai
oai:soar-ir.repo.nii.ac.jp:00003702
2022-12-14T03:49:07Z
461:462
Transfer function for vital infrasound pressures between the carotid artery and the tympanic membrane
Furihata, Kenji
Yamashita, Masato
Copyright© 2013 Acoustical Society of America.
While occupational injury is associated with numerous individual and work-related risk factors, including long working hours and short sleep duration, the complex mechanisms causing such injuries are not yet fully understood. The relationship between the infrasound pressures of the tympanic membrane [ear canal pressure (ECP)], detected using an earplug embedded with a low-frequency microphone, and the carotid artery [carotid artery pressure (CAP)], detected using a stethoscope fitted with the same microphone, can be quantitatively characterized using systems analysis. The transfer functions of 40 normal workers (19 to 57 years old) were characterized, involving the analysis of 446 data points. The ECP waveform exhibits a pulsatile character with a slow respiratory component, which is superimposed on a biphasic recording that is synchronous with the cardiac cycle. The respiratory ECP waveform correlates with the instantaneous heart rate. The results also revealed that various fatigue-related risk factors may affect the mean magnitudes of the measured pressures and the delay transfer functions between CAP and ECP in the study population; these factors include systolic blood pressure, salivary amylase activity, age, sleep duration, postural changes, chronic fatigue, and pulse rate. [https://doi.org/10.1121/1.4773270]
Article
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA. 133(2):1169-1186 (2013)
ACOUSTICAL SOC AMER AMER INST PHYSICS
2013-02
eng
journal article
VoR
http://hdl.handle.net/10091/17690
https://soar-ir.repo.nii.ac.jp/records/3702
https://pubmed.ncbi.nlm.nih.gov/23363133
23363133
https://doi.org/10.1121/1.4773270
10.1121/1.4773270
0001-4966
AA00253792
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
133
2
1169
1186
https://soar-ir.repo.nii.ac.jp/record/3702/files/Transfer_function_vital_infrasound_pressures.pdf
application/pdf
3.7 MB
2015-09-24