Impact of Low-Level Blast Exposure From Military Training and Career Cumulation on Hearing Outcomes
Notice bibliographique
Résumé
INTRODUCTION: Occupational trades expose military service members to unique sound exposure profiles, distinct in frequency and amplitude to those commonly studied in industrial settings. Characteristics of the energy exposure incurred through blast exposure exercises a distinct mechanism of injury in the auditory system that yield acute and cumulative health impacts. The following paper considers physiological and self-reported data attributed to repeated low-level blast exposure. We focused our analysis to examine objective audiological metrics of blast overpressure damage to quantify the impact of discrete and accumulated blast exposure for military service members. MATERIALS AND METHODS: This study was reviewed and approved by the Human Research Ethics Committee of Defense Research and Development Canada. Data were collected in a cross-sectional, repeated measures observational design. Participants comprised service members who took part in a training course using controlled explosives (n = 46) and an age- and sex-matched control group (n = 42) with noise exposure but no history of blast exposure. Extensive demographic and subjective health data were captured additional to a battery of quantitative health data. Nonlinear mixed effect models with bivariate generalized additive architecture, Friedman's test, and repeated measures ANOVA models were applied. RESULTS: Subjective tinnitus and hearing scores were sensitive to life-time blast overpressure exposure (P = .034) and a delta of low- (2-4 kHz) and high-frequency (4-8 kHz) audiometric threshold averages significantly differentiated by both cumulative (P = .0016) and training course exposure (P = .0142). Furthermore, audiometric values showed progressive increasing variance in high frequencies (>4 kHz) in blast-exposed participants with worsening audiometric outcomes. Variation in high-frequency hearing thresholds may be attributed to differences in energy exposure because of structural differences between individuals or differences in exposure profiles (produced either by diversity in PPE compliance or exposure sources). CONCLUSION: Military members exposed to blasts in a training environment and accumulated through a career experience adverse hearing and audiometric impacts. However, better measures of hearing injury should be pursued to improve understanding of injury mechanism and injury progression which may inform risk and medical interventions. Blast-induced hearing injuries are dynamic and change over time between acute and chronic phases which are further exacerbated with multiple blast exposures presented consecutively.
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Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
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