PhD, University of Cincinnati, 2022, Allied Health Sciences: Communication Sciences and Disorders
Occupational noise exposure is pervasive in military and law enforcement communities, where the heterogenous nature of duties and mixed exposure to continuous and impulse noise make direct noise measurements challenging when attempting to quantify overall noise exposure. A military or law enforcement dog works as a unit with its handler, and both experience similar noise exposures. Research regarding noise exposure and consequent hearing loss in dogs has been limited, but evidence has been growing that noise damages canine hearing. One aim was to quantify occupational noise exposure experienced by 38 working dogs through surveys completed by their handlers. Survey data demonstrated that small arms (100%) and emergency sirens (84%) were the most prevalent noise sources. Using the Lifetime Exposure to Noise and Solvents Questionnaire as a model, the K9 Noise Questionnaire was developed to allow the calculation of noise exposure scores. This noise exposure score, along with its age and years in service, were assessed as possible predictors of auditory function in working dogs. The brainstem auditory evoked response (BAER) was used to estimate hearing levels. Using multiple linear regression, the relationships connecting noise exposure score, age, and years in service with BAER thresholds were investigated. A significant relationship for a two-predictor model consisting of noise score (p = .025) and years in service (p = .042) was identified. As hypothesized, when noise exposure score increased, the BAER threshold increased. Contrary to hypothesis, however, as years in service increased, BAER threshold decreased. This may be because inexperienced dogs with fewer years in service are not as comfortable completing BAER testing while awake, resulting in increased myogenic artifact and biological noise which can contaminate BAER results. However, further study of this point is needed. A second aim was to measure the degree of change in the auditory system resulting from imp (open full item for complete abstract)
Committee: Peter Scheifele Ph.D. (Committee Member); Stephen Lee Ph.D. (Committee Member); Brian Earl Ph.D. (Committee Member); Jeffrey DiGiovanni Ph.D. (Committee Member)
Subjects: Veterinary Services