Glucose as a Biomarker for Stress in Firefighters

OBJECTIVE: This study aims to assess glucose as a biomarker for the sympathetic stress response in firefighters. METHODS: Fifteen professional firefighters wore continuous glucometers over a 12-day period. We observed glucose levels during on-duty emergency calls and off-duty stressful events. Perceived stress levels were reported, and metabolic confounders (food and drink intake) were recorded. RESULTS: Glucose both increased and decreased during stressful events, with 39% of on-duty glucose decreases being associated with physically demanding tasks. The magnitude of glucose change was affected by perceived stress and duration of emergency calls. Stressful events happened 5.43 times (95% CI, 4.31-6.85) more often on-duty. On-duty fasting glucose values varied significantly from off-duty fasting glucose values. CONCLUSIONS: Our findings shed light on the relationship between occupational stress and high prevalence of stress-related health conditions in firefighters.