Circadian heart rate variability rhythm in shift workers.

@article{Freitas1997CircadianHR,
  title={Circadian heart rate variability rhythm in shift workers.},
  author={Jo{\~a}o Freitas and P Lago and J Salas Puig and M{\'a}rio Jorge Carvalho and O. A. Dalla Costa and Ant{\'o}nio Falc{\~a}o de Freitas},
  journal={Journal of electrocardiology},
  year={1997},
  volume={30 1},
  pages={39-44}
}
The objective of this study was to assess the influence of day-night cycle and sleep-awake period on the circadian pattern of heart rate variability (HRV). Twelve male oil refinery security shift workers, aged 39 +/- 7 years, were studied with 24-hour Holter monitor recordings during morning and night work periods. Hourly HRV parameters in the time and frequency domains were evaluated. For both shifts, all HRV parameters during awake or work periods were found not to be statistically different… CONTINUE READING

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