Heart Rate Variability Analysis in Workers Exposed to Methyl Bromide as a Quarantine Treatment

Objective: To determine whether methyl bromide (MB) fumigation work for plants imported in Korea affects workers’ health by assessing heart rate variability (HRV). Methods: We measured HRV indices (TP, VLF, LF, HF, HR, SDNN, pNN50 and HRV-index) and urinary bromide ion (Br−) in 62 fumigators (study group) and 34 inspectors (the control group) before and after fumigation work. In addition, the relationship between Br− concentration and HRV indices was analysed. Results: The fumigators’ post-work HRV indices and Br− level were changed compared with their pre-work values (P