Citation

Jafari Roodbandi A, Choobineh A, Daneshvar S. Int. J. Occup. Safety Ergonomics 2015; 21(3): 312-317.

Affiliation

c MS in occupational health engineering, Medical Sciences department , Tarbiat Modares University , Tehran , Iran.

Copyright

(Copyright © 2015, Centralny Instytut Ochrony Pracy - Państwowy Instytut Badawczy, Publisher Informa - Taylor and Francis Group)

DOI

10.1080/10803548.2015.1081770

PMID

26414996

Abstract

INTRODUCTION: Sleep is affected by circadian cycle and its features. Amplitude and stability of circadian rhythm are important parameters of circadian cycle. This study aims to examine the relationship between amplitude and stability of circadian rhythm with sleep quality and sleepiness.

METHOD: In this cross-sectional research, 315 shift nurses and health care worker of educational hospitals of Kerman University of Medical Sciences (KUMS), Iran, were selected using random sampling method. Pittsburgh Sleep Quality Index (PSQI), Epworth Sleepiness Scale (ESS) and Circadian Type Inventory (CTI) were used to collect the required data.

RESULTS: In this study, 83.2% suffered from poor sleep and one half had moderate and excessive sleepiness. The results showed that flexibility in circadian rhythm stability, job stress and sleepiness are among the factors affecting quality sleep in shift workers.

DISCUSSION: Those whose circadian rhythm amplitude was languid suffered more from sleepiness and those whose circadian stability was flexible had a better sleep. The variables including circadian rhythm stability (FR) and amplitude (LV) can act as predictive indices in order to employ people in shift work system so that sleepiness and drop in quality sleep are prevented.

Language: en