Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Does loud sound influence the intracochlear oxygen tension?

A L Nuttall, E Hultcrantz, M Lawrence

    Hearing Research
    |November 1, 1981
    PubMed
    Summary

    This study investigates how loud noises affect oxygen levels in the inner ear fluid of guinea pigs. Researchers found that typical loud sounds do not significantly change these oxygen levels, and observed fluctuations were often caused by experimental artifacts like air currents rather than the sound itself.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Exercise transiently increases the density of incipient blood clots in antiplatelet-treated lacunar stroke patients.

    Thrombosis journal·2024
    Same author

    Effect of short-term abomasal corn starch infusions on postruminal fermentation and blood measures.

    Journal of dairy science·2023
    Same author

    Outer hair cell driven reticular lamina mechanical distortion in living cochleae.

    Hearing research·2021
    Same author

    The treatment effect of rivaroxaban on clot characteristics in patients who present acutely with first time deep vein thrombosis.

    Clinical hemorheology and microcirculation·2021
    Same author

    Evaluating the effects of Lactobacillus animalis and Propionibacterium freudenreichii on performance and rumen and fecal measures in lactating dairy cows.

    Journal of dairy science·2021
    Same author

    The effect of the acute inflammatory response of burns and its treatment on clot characteristics and quality: A prospective case controlled study.

    Burns : journal of the International Society for Burn Injuries·2019

    Area of Science:

    • Auditory physiology research within intracochlear oxygen tension studies
    • Sensory systems biology and otolaryngology

    Background:

    The precise physiological impact of intense acoustic stimulation on inner ear oxygenation remains poorly defined. Prior research has shown that metabolic demands increase during auditory activity, yet the stability of perilymphatic oxygen tension is debated. This gap motivated an examination of how loud sounds alter the chemical environment within the cochlea. That uncertainty drove the need for controlled experiments to isolate acoustic effects from environmental variables. No prior work had resolved whether observed oxygen shifts were genuine biological responses or measurement errors. Investigators previously struggled to differentiate between metabolic changes and physical artifacts during high-intensity sound exposure. This study addresses the lack of clarity regarding cochlear homeostasis under extreme acoustic stress. Establishing these baseline responses is necessary for understanding potential mechanisms of noise-induced hearing loss.

    Purpose Of The Study:

    The aim of this research was to determine if loud sound exposure influences the oxygen tension within the perilymphatic space of the inner ear. Scientists sought to clarify the relationship between intense acoustic stimulation and cochlear metabolic homeostasis. Prior studies had provided conflicting reports regarding whether noise levels could significantly alter oxygen availability in the cochlea. This gap motivated a systematic investigation using controlled acoustic inputs and precise measurement techniques. The researchers intended to isolate the effects of sound from potential experimental artifacts that could confound data collection. By testing various sound intensities and frequencies, the team hoped to establish a reliable baseline for cochlear oxygen dynamics. That uncertainty drove the need for rigorous testing in an animal model to verify if physiological shifts occur under stress. The study specifically addresses whether observed oxygen changes are genuine biological responses or merely consequences of the measurement environment.

    Keywords:
    perilymphatic oxygencochlear physiologynoise exposureauditory system

    Frequently Asked Questions

    The researchers observed that intense noise at 130 dB SPL caused minor fluctuations in perilymphatic oxygen levels, but these changes remained below 12%. In contrast, pure tones or lower-intensity noise did not produce any measurable impact on the oxygen tension within the cochlear fluid.

    The team utilized anesthetized guinea pigs as their primary model. They delivered pure tones at 4 kHz and broad-band noise at intensities ranging from 85 to 130 dB SPL for durations between three and eight minutes to evaluate the physiological response.

    The authors propose that the immediate drop in oxygen tension observed when sound was delivered into the opened bulla was caused by the cooling effect of air currents. This physical artifact was confirmed by flushing the bulla with various gases, which triggered identical temperature-induced measurement drops.

    Related Experiment Videos

    Main Methods:

    The review approach involved evaluating perilymphatic oxygen levels in anesthetized guinea pigs exposed to various acoustic stimuli. Investigators applied pure tones at 4 kHz and broad-band noise at intensities reaching 130 dB SPL. The team monitored these subjects for durations lasting between three and eight minutes to capture potential physiological shifts. To assess the impact of systemic status, researchers tracked blood pressure levels throughout the procedure. The study design included delivering sound directly into the opened bulla to test for localized effects. Scientists performed control trials by flushing the bulla with nitrogen, air, or oxygen to isolate thermal variables. This methodology allowed the team to differentiate between biological responses and physical artifacts. The approach focused on identifying whether observed oxygen fluctuations were genuine or caused by environmental interference.

    Main Results:

    Key findings from the literature indicate that pure tones and broad-band noise at 85 dB SPL produced no measurable effects on perilymphatic oxygen tension. In subjects exposed to 130 dB SPL noise, oxygen levels showed fluctuations, yet these changes remained at or below 12%. The researchers observed that perilymphatic oxygen tension fluctuated in direct correlation with systemic blood pressure in hypotensive animals. An immediate drop in measured oxygen occurred when sound was delivered directly into the opened bulla. This specific decline was attributed to the cooling effect of air currents generated by the noise source. Flushing the bulla with nitrogen, air, or oxygen produced identical temperature-induced drops in oxygen readings. The cochlear response to anoxia remained normal throughout the experimental sessions. These results demonstrate that high-intensity sound does not significantly alter the oxygen environment of the inner ear.

    Conclusions:

    The authors conclude that loud sound exposure does not consistently alter perilymphatic oxygen tension in the guinea pig model. Synthesis and implications suggest that previous reports of oxygen fluctuations may have been influenced by experimental artifacts. The researchers highlight that air currents generated by high-intensity noise can induce cooling, which affects oxygen sensor readings. This finding implies that researchers must carefully control for thermal changes when measuring gas levels in the inner ear. The study confirms that the cochlear response to anoxia remains normal despite high-intensity acoustic stimulation. The authors emphasize that observed oxygen shifts were minimal, rarely exceeding twelve percent of baseline values. These results suggest that the inner ear possesses robust mechanisms to maintain oxygen homeostasis during intense sound. The work provides a cautionary perspective on interpreting physiological data in the presence of loud acoustic stimuli.

    The researchers employed direct measurements of perilymphatic oxygen tension to assess cochlear status. They also monitored blood pressure, noting that in hypotensive animals, oxygen levels fluctuated in direct correlation with systemic blood pressure, demonstrating the dependence of cochlear oxygenation on circulatory stability.

    The study measured the response to anoxia to verify the functional integrity of the cochlear environment. This measurement confirmed that the inner ear maintained a normal physiological response, indicating that the experimental conditions did not impair the basic metabolic processes of the cochlea during the tests.

    The authors suggest that future studies must distinguish between genuine metabolic responses and physical artifacts. They imply that previous findings of oxygen changes during noise exposure might be misinterpreted due to the cooling effects of air currents, necessitating more rigorous control of the experimental environment.