Circadian heart rate variability rhythm in shift workers

• Type: Article in International Scientific Journal
• Date: 1997

Authors

Freitas, J (Author) Other; Lago, P (Author) FCUP; Puig, J (Author) Other; Carvalho, MJ (Author) Other; Costa, O (Author) Other; deFreitas, AF (Author) Other

Journal

Title: Journal of Electrocardiology

Vol. 30

Pages: 39-44

ISSN: 0022-0736

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 35 Citations

Scopus - 42 Citations

Other information

Authenticus ID: P-001-CNY

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

Abstract (EN): 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 nor to be statistically different. In both day and night work shifts, the very low frequency and high-frequency components of HRV and the proportion of differences in successive R-R intervals greater than 50 ms increased during the sleep period, while the low frequency/high frequency ratio decreased. The low-frequency component in absolute units and the SD of the R-R interval did not show any variation in either shifts for the different periods. These results suggest that the circadian pattern of HRV seems to be predominantly related to sleep (supine) and wakefulness (standing) and remains independent of night-day cycle.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6