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).
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Pure Tone Audiometry
Timeframe: Safety Arm: Twice per week, pre- and post- treatment, to the end of treatment at 4 weeks. Efficacy Arms: Every 3 months, pre- and post-treatment, for 1 year.
Distortion Product Otoacoustic Emissions
Timeframe: Safety Arm: Twice per week, pre- and post- treatment, to the end of treatment at 4 weeks. Efficacy Arms: Every 3 months, pre- and post-treatment, for 1 year.
Adverse Event Questionnaire
Timeframe: Immediately post-treatment; 3-hours and 24-hours post-treatment.