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Factors related to heart rate variability among firefighters.

ABSTRACT: OBJECTIVES:The aim of this study was to investigate factors associated with heart rate variability in firefighters working in a metropolitan city in South Korea. METHODS:Self-administered questionnaires including Korean Occupational Stress Scale (KOSS) as well as surveys collecting socio-demographic characteristics and work-related factors were given to 962 firefighters. After exclusion for missing data, 645 firefighters were included, and analysis of covaiance adjusted for the general risk factors and job characteristics were used to assess the relationship between heart rate variability and associated factors. RESULTS:SDNN and RMSSD and were decreased in the area of occupational climate of the group with high job stress (p?=?0.027, p?=?0.036). HF(ln) was decreased in the area of organizational system and occupational climate of the group with high stress that statistically significant level (p?=?0.034, p?=?0.043). CONCLUSIONS:Occupational climate and organizational system are associated with reduction of heart rate variability. Preventive medical care plans for cardiovascular disease of firefighters through the analysis and evaluation of job stress factors are needed.

SUBMITTER: Shin JH

PROVIDER: S-EPMC4904363 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

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Factors related to heart rate variability among firefighters.

Shin Jae-Hong JH Lee Jung-Youb JY Yang Seon-Hee SH Lee Mi-Young MY Chung In-Sung IS

Annals of occupational and environmental medicine 20160613

<h4>Objectives</h4>The aim of this study was to investigate factors associated with heart rate variability in firefighters working in a metropolitan city in South Korea.<h4>Methods</h4>Self-administered questionnaires including Korean Occupational Stress Scale (KOSS) as well as surveys collecting socio-demographic characteristics and work-related factors were given to 962 firefighters. After exclusion for missing data, 645 firefighters were included, and analysis of covaiance adjusted for the ge ...[more]

PMID: 27298728

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Project description:Heart rate variability (HRV) is the variation of cardiac inter-beat intervals over time resulting largely from the interplay between the sympathetic and parasympathetic branches of the autonomic nervous system. Individual differences in HRV are associated with emotion regulation, personality, psychopathology, cardiovascular health, and mortality. Previous studies have shown significant heritability of HRV measures. Here we extend genetic research on HRV by investigating sex differences in genetic underpinnings of HRV, the degree of genetic overlap among different measurement domains of HRV, and phenotypic and genetic relationships between HRV and the resting heart rate (HR). We performed electrocardiogram (ECG) recordings in a large population-representative sample of young adult twins (n=1060 individuals) and computed HRV measures from three domains: time, frequency, and nonlinear dynamics. Genetic and environmental influences on HRV measures were estimated using linear structural equation modeling of twin data. The results showed that variability of HRV and HR measures can be accounted for by additive genetic and non-shared environmental influences (AE model), with no evidence for significant shared environmental effects. Heritability estimates ranged from 47 to 64%, with little difference across HRV measurement domains. Genetic influences did not differ between genders for most variables except the square root of the mean squared differences between successive R-R intervals (RMSSD, higher heritability in males) and the ratio of low to high frequency power (LF/HF, distinct genetic factors operating in males and females). The results indicate high phenotypic and especially genetic correlations between HRV measures from different domains, suggesting that >90% of genetic influences are shared across measures. Finally, about 40% of genetic variance in HRV was shared with HR. In conclusion, both HR and HRV measures are highly heritable traits in the general population of young adults, with high degree of genetic overlap across different measurement domains.

Dataset Information

Factors related to heart rate variability among firefighters.

Publications

Factors related to heart rate variability among firefighters.

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