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Updated: Jan 30, 2026

Estrogen-Like Effect of Bazi Bushen Capsule in Ovariectomized Rats
Published on: April 7, 2023
Effects of Noise Exposure on the Auditory Function of Ovariectomized Rats with Estrogen Deficiency
Xujun Hu1, Ying Wang, Chi Chuen Lau
1Zhejiang Chinese Medical University, College of Medical Technology, Hangzhou, Zhejiang, China. ellawang@zcmu.edu.cn.
Objective:
The benefits of estrogen for the auditory function of women depend on a number of factors. In this study, we aimed to examine the impact of noise trauma on the auditory function of ovariectomized rats with estrogen deficiency.
Materials And Methods:
Twenty-eight young, female Sprague-Dawley rats were assigned to three groups (OVX+N, OVX-N, Sham+N). Rats in the OVX+N group and the OVX-N group underwent bilateral ovariectomy (OVX); the OVX+N group alone was also exposed to white noise (N) of 115 dB SPL for 8 hours a day over 14 days. The Sham+N group consisted of rats with intact ovaries that were exposed to the same noise. The auditory function of all rats was measured before treatment and after noise exposure by the signal-to-noise ratio (SNR) of distortion-product otoacoustic emissions (DPOAE) and the threshold of auditory-evoked brainstem response (ABR).
Results:
The Sham+N group (intact ovaries, noise-exposed) had worse auditory function than the OVX-N group (ovariectomy, no noise). The OVX+N group had decreased SNRs of DPOAE and increased ABR thresholds relative to the Sham+N group.
Conclusion:
Noise exposure may cause greater damage to auditory function when estrogen levels are low in females.
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