Abstract：
:This paper reports hourly and daily monitoring of the frequencies of spontaneous otoacoustic emissions. Regular circadian variations in frequency were found in two of three subjects. Consistent monthly variations, in step with the menstrual cycle, were seen in three of four women. The circadian cycle typically showed a rise in frequency of 0.6-1% while asleep and a similar fall while awake. The monthly cycle typically saw frequencies rise and fall by 0.4-0.6%, reaching a minimum near the onset of menstruation, and rising to a peak close to ovulation. A review of the literature revealed that certain cardiovascular parameters such as arterial blood pressure follow, over both daily and menstrual cycles, a broadly similar time course to SOAE frequency. Further experiments produced data supporting a relationship between blood pressure and SOAE frequency, and it is therefore suggested that much of the circadian-linked, menstrual-linked, and background variation in SOAE frequency may arise from cardiovascular changes. A likely causal mechanism, involving cerebrospinal fluid, is discussed.
journal_name
Hear Resjournal_title
Hearing researchauthors
Bell Adoi
10.1016/0378-5955(92)90012-ckeywords:
subject
Has Abstractpub_date
1992-02-01 00:00:00pages
91-100issue
1eissn
0378-5955issn
1878-5891pii
0378-5955(92)90012-Cjournal_volume
58pub_type
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