Circadian heart rate variability rhythm in shift workers

Freitas, João Miguel; Lago, Pedro; Puig, J; Carvalho, Manuela; Costa, O; Freitas, A. Falcão de

doi:10.1016/s0022-0736(97)80033-7

Cited by 46 publications

(32 citation statements)

References 13 publications

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“…One study of shift workers found lower SDNN and RMSDD during a night shift compared to sleep at night (45). By contrast, some studies have not been able to show this association between higher LF/HF and lower variability and shift work (54)(55)(56). The current study confirmed that these predominant observations of higher LF/HF or normalized LF power and lower variance are also detectable among shift workers studied in a controlled laboratory setting.…”

Section: Discussionsupporting

confidence: 82%

Heart rate variability and endothelial function after sleep deprivation and recovery sleep among male shift and non-shift workers

Wehrens¹,

Hampton²,

Skene³

2011

Scand J Work Environ Health

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Section: Discussionsupporting

confidence: 82%

Heart rate variability and endothelial function after sleep deprivation and recovery sleep among male shift and non-shift workers

Wehrens¹,

Hampton²,

Skene³

2011

Scand J Work Environ Health

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“…All selected HRV parameters in frequency-domain (TP, HF and LF components, and LF/HF ratio) during the awake, work, and sleep periods were not statistically different between shifts. The LF/HF ratio was lower in the sleeping period and higher in the waking and working periods of workers on both shifts 54,55) , and the HF component was higher during the sleeping period and lower in the waking and working periods of workers on both shifts 54,55) . Among emergency physicians, post-night shift (0700-1500) values for mean RRI, SDNN, and the HF component were significantly higher than both pre-(1500-2300) and mid-night shift (2300-0700) values 56) .…”

Section: Working Time Night-shift Workmentioning

confidence: 88%

“…Two studies 54,55) compared 24-h HRV between day (working from 0800 to 1700 or from 0600 to 1400) and night (working from 2140 to 0840 or from 2200 to 0600) shifts. All selected HRV parameters in frequency-domain (TP, HF and LF components, and LF/HF ratio) during the awake, work, and sleep periods were not statistically different between shifts.…”

Section: Working Time Night-shift Workmentioning

confidence: 99%

“…Several studies have shown altered circadian rhythms of HRV in night shift workers [54][55][56] . The circadian pattern of HRV and cardiac autonomic activity seem to be predominantly related to the level of physical activity or sleep (supine) and wakefulness (standing), and remains independent of the night-day cycle 54,55) .…”

Section: Working Time Night Shift Workmentioning

confidence: 99%

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Heart Rate Variability in Occupational Health ―A Systematic Review

2009

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BackgroundCardiovascular disease (CVD) is the leading cause of mortality and morbidity in industrialized countries 1) . In a working population, occupational factors are believed to pose a threat to workers' cardiovascular health. Substantial research has shown that adverse physical and psychosocial work environments and working conditions, such as shift work and excessive workload, are related to CVD. To examine the acute and chronic effects of such work-related factors on the cardiovascular system, cardiac autonomic nervous system activity during work and rest has been assessed by heart rate variability (HRV).Heart rhythm is recorded by electrocardiography. The measured signal shows a series of waves that present electrical events in the four chambers and the conduction pathways within the heart. The time interval between consecutive R waves that correspond to the contraction of the ventricles is called the RR interval (RRI). HRV is a time series of RRIs that fluctuate beat by beat in healthy humans because of time-to-time changes in activities of sympathetic and parasympathetic nerves innervating to the sinus node.HRV is generated in part by periodic inputs of both respiration and blood pressure variability into the medullary cardiovascular centers 2) . These periodic modulations are clearly identified within the power spectrum of HRV as peaks at the respiratory frequency (≈ 0.25 Hz) and at the frequency of the well-known Mayer wave (0.1 Hz) in blood pressure variability 1,3) .Heart rate increases and decreases during inspiration and expiration, respectively. This is mainly caused by the physiological fact that parasympathetic output from the cardiovascular center is inhibited during inspiration 4) . Respiratory rhythm during rest is about 0.25 Hz. Therefore, exposure to occupational toxicants and hazardous environments), psychosocial workload (i.e. job stressors), and working time (i.e. shift work) had been examined and identified as having associations with low HF power. These findings may indicate that research into parasympathetic nervous system activity should be focused to protect cardiovascular health at work. We also propose the use of very low and ultralow frequency HRV components in autonomic research for workers' health.

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“…Shift workers are prone to higher rates of cardiac, gastrointestinal and reproductive disorders (10,11). Furthermore, shift working nurses have greater difficulty falling or staying asleep; they also frequently suffer from severe autonomic disturbances (6,12). Thus, a relationship is discernible between shift working and autonomic nervous system disturbances among nurses.…”

mentioning

confidence: 99%