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The goal of this interventional clinical study is to investigate the use of mild therapeutic hypothermia devices for preservation of sensory structures in the cochlea after noise exposure. The main aims of the study are: 1. To test the safety and best duration for use for a new hypothermia device. 2. To determine if the hypothermia device helps decrease noise-induced hearing loss in a group of firefighters. Participants will wear the mild therapeutic hypothermia therapy devices immediately after a fire service shift serially over a year. Researchers will compare results from those receiving the therapy to those from a control group (individuals receiving no therapy and a sham therapy).
The Apple Hearing Study is a partnership between the University of Michigan and Apple to study sound exposure and its impact on hearing health. This groundbreaking study will advance the understanding of how hearing could be impacted over time by exposure to sound at certain levels. The investigators will measure headphone and environmental sound exposures over time among participants, and determine how these exposures impact hearing and stress levels. US residents who own an iPhone, download the Apple Research app and consent to participate will be randomly assigned to two groups, one with a "Basic" user interface in the Research app, and one with an "Advanced" user interface. Users in the "Advanced" group will receive additional information about their exposures and be given additional surveys and hearing tests based on their music and environmental sound exposures. The study will provide investigators with a better understanding of listening behavior and its overall impact on hearing health. This information will in turn help guide public health policy and prevention programs designed to protect and promote hearing health in the US and globally.