| Title | Heart rate variability in male shift workers in automobile manufacturing factories in South Korea. | ||
| Author | Lee, Sangyoon; Kim, Ho; Kim, Dae-Hwan; Yum, Myunggul; Son, Mia | ||
| Journal | Int Arch Occup Environ Health | Publication Year/Month | 2015-Oct |
| PMID | 25585818 | PMCID | -N/A- |
| Affiliation + expend | 1., Chuncheon, Republic of Korea. | ||
PURPOSE: The aim of this study was to determine the effect of circadian rhythm disruption on cardiovascular autonomic regulation by examining potential differences in heart rate variability (HRV) between day- and night-shift workers. METHODS: The study population consisted of 162 workers who worked both day and night shifts in two automobile manufacturing companies who underwent ambulatory 24-h electrocardiogram recording and completed questionnaires and sleep diaries. Both time and frequency domain indices of HRV were compared. RESULTS: HRV parameters (mean RR, SDNN, RMSSD, pNN50, TP, HF, LF, LF/HF ratio) reflecting sympathetic and parasympathetic modulation varied less with activity in night-shift workers. CONCLUSIONS: Circadian rhythm-mediated changes in autonomic regulation of the cardiovascular system were blunted in night-shift workers, which could contribute to an increased risk for cardiovascular disease in overnight workers.